Marijuana Plant Problems Part 2

by MiMM
Published on: October 1, 2012

Sick plants that are from bug infestation, ph problems and over watering/under watering

Over watering

Over watering is one of the biggest mistakes new growers make, reason for this is, because they feel the need to give there plant everything and will overdue a lot of things and one of them is over watering. By over watering your plant you soak the roots so much, they can’t get enough oxygen and slowly die. The plant shows signs of over watering by: Wilting, droopy look, yellow and or dead leaves falling off, which includes leaves that don’t look dead falling off. One of the best ways to tell how NOT to over water is by, picking up the pot when it is dry and then picking up the pot after you water. (This is a reason why it’s smart to use light pots.) When you water, you want to water just enough to where you see a bit of water coming out of the bottom, not gushing or pouring out. Just enough to see a little bit, then you know the plant has enough water. To prevent over watering you can either: add more perlite to your soil, add hydrogen peroxide to your water for extra oxygen, all the while killing bacteria if any in the soil. After watering, wait a few days to water. Mj plants like a good watering and then a couple days to dry out in between watering. So it’s very easy to over water. Besides the weight of the pot, another way to test if your plant needs water is to stick your index finger a couple inches into the soil. If the soil at the tip of your finger feels almost dry, then it’s time to water again. The top of the soil should be allowed to dry out between waterings if it’s still moist the plant does NOT need watered. You can also use a moisture meter which will tell you the level of moisture down in the soil. You can buy them at most garden supplies or hydro shops.

Here is a picture of what over watering looks like:

Under Watering

Under watering can show the exact same symptoms as over watering can, they show the droopiness along with the top soil being hard. To avoid this make sure every other other watering you give your plants a good watering, like use a bit more water then you normally do, because sometimes your plants will need a good quenching once in a while. So doing this will help the bottom roots and root hairs get enough water to produce newer growth. For new growers they tend to do both over watering and under watering.
More over watering then anything else, they tend to be to “generous”, and then you have ones that are to afraid to water them to much and then they get the under watering symptom. Under watering seems to droop more than over watering does, the fan leaves will droop closer to the stalk and won’t be as yellow as over watering looks like, under watering looks like this picture below, only way to stop under watering is to water when the pot feels lite. Make sure few drips of water come out at the bottom of the holes, that way you know the plant has enough water.

Root Rot

What causes root rot? Low Oxygen levels. (DO) Disolved Oxygen. Temp’s are the main reason for root rot, Low temps will lower the DO levels and high temps will cause low DO levels. Keeping temps between 65 to 72 will allow MAX DO levels or max o2 for roots.

Over watering also causes root rot, Root Rot infects parts of the roots, which then spread infecting the whole roots causing death, Root Rot can be caused by to high of temps in hydro as well as over watering. Not enough drainage in your soil can cause Root Rot, even signs of it looking over watered, because the soil holds moisture to long for the roots to dry out.

So these 3 things are all connected. The main one that causes everything is over watering. Once you find out you have root rot, depending on how bad the problem is, you can add H202( Hydrogen Peroxide) with your water or hydro setup to kill the bacteria caused from root rot. If the plant is severely taken over by it, there are only a few things you can do, cut off the roots affected by it depending on if its hair roots or tap roots, add H202, or just chop the plant. To prevent Root Rot, adding product’s like Thrive Alive B-1, See Weed, Super thrive will help protect your plant’s from root rot and will help cure root problems.

Here is what root rot looks like.

First pic is of too high temps in the bubbler: Last 2 pics came from chemical burn root rot first pic, moldy rock wool with root rot.

Ph Problems

One of the first signs of having a slight ph problem is, your plant having part of the leaves kind of twisty, spotty with brown, yellowish, red spots within each other.

Sometimes they don’t have to have all the colors, they could just be spots that have yellowish brown, or just reddish brown and can happen anywhere on the plant. Mainly starts on big fan leaves then goes to little leaves.
When this happens you need to check your soil ph, water ph before and after adding your nutrients. One of the biggest causes is adding nutrients like earth juice; they take the ph down quite a bit. Also can happen when you add bone and blood meal to your soil, that will throw the ph off as well, so it’s smart to test the mix before putting your plants into the mix. After the spots happen you will soon see nutrients being locked out, when that happens DO NOT ADD ANYTHING TO FIX THE PROBLEM UNTIL YOU GET YOUR PH FIXED!! Reason why is, because the plant isn’t absorbing that nutrient, by adding the nutrient it is deficient in, you are causing it to have a build up in the soil therefore can cause that nutrient to become toxic to the plant, because of buildup, too much buildup of certain nutrients will lock out other nutrients. In order to fix the problem you will need to first fix the ph and then if the soil is deficient in nutrients you can add it to fix the problem.

A digital PH tester is the best tester to use as they are the most accurate. If you can’t afford a digital ph meter, then your best bet is to get ph testing papers. DO NOT get soil testers, those are the cheapest junk I ever seen and do not give good readings, so you cant rely on one of those. There are a lot of good ph testers out there, one of them is hanna. That is the one I use and is the best money ever spent!

Vast majority of problems with soil ph comes from the soil if it has additives like peat moss, which is HIGHLY acidic, and or the water you are using, as well as nutrient deficiencies from using the wrong ph for watering. You want to be careful when adjusting your ph, doing this over a week is the best idea, too fast will cause shock to the plant. If you can’t get ahold of a ph tester or ph test papers. If you have some dolomite lime, its always better to use it in soil rather than every time you water, imo and from others that it really doesn’t stabilize as many people think it does, Soil pH and micronutrient availability are interrelated. Don’t Use too much lime to decrease the soil pH to a point where micronutrients can’t be unavailable to plants. The micronutrients affected by pH include iron, manganese, zinc and, not as often copper. The problems when you apply too much lime can make it harder to correct your ph than what you would have when you didn’t add as much lime. You can always add more lime, but if you add to much you can’t remove it if you put to much lime in the soil. With great soil moisture, lime will work immediately and pH will start to change over a few months. However, it can take up to a year for the real benefit of lime to work. As the soil pH rises, the time it takes for lime to react decreases due to lower levels of soil acids. If you need to change your ph when its to high, if you choose to use lime it will not help as much as you think in lowering your ph, it would need a lot of lime to lower your ph to a point where it would cause a toxcicity to the plants so look else where to use something to lower your ph rather than using lime.

So here is a list of some buffers that are good to go with when raising and lowering ph!

Here are some ph buffers when your ph is too high: Use these SOIL PH Adjustments to lower your ph: sawdust, composted leaves, wood chips, cottonseed meal, leaf mold and peat moss. Sawdust, composted leaves, woodchips and, lemon juice, PH DOWN.

Hydro PH Adjustments: PH Down (vinegar and lemon juices are good for soil, but not recommended for hydro use) Phosphoric acid during flowering and Nitric acid for vegetative growth.Thanks goes out to syko2 for that one! (Only quality PH buffers should be used to adjust ph and be sure the buffer and nutrient work’s well together.)

Here are some that will raise the ph: use these SOIL Adjustments when your ph is to low: PH UP, dolomite lime, hardwood ash, bone meal, crushed marble, or crushed oyster shells, potassium hydroxide.

Hydro Adjustments: PH UP,lime,potassium hydroxide and potassium sillicate .(Only quality PH buffers should be used to adjust ph and be sure the buffer and nutrient work’s well together.)

Here are a few pictures of ph spotting before nutrient lockout occurs. The last pic is shown is high ph with the twisty leaves. Note the edges are brown, this is a potassium deficiency that is caused by ph lockout.(Sometimes this gets confused with a nitrogen toxicity, so always keep your ph in check and test it often!)

Bud Rot
During the last week or two of flowering, depending on if you use chemical or organics. If you use chemical, you want to flush 1 ½ weeks to 2 weeks before harvest to flush out all of the chemical nutrients that your plant was using. If you are using Organics then you would want to flush about a week before harvest. Giving them plain water is fine, flushing them also improves the overall quality of your bud. Once you start to ‘flush’ you should check extra careful for bud rot. Bud Rot Happens when the humidity is high, if you have fat dense buds, or if mold spores are in the air. Bud rot looks like a black brownish sludge that can quickly take over your plant and ruin your harvest. The mold spores are air-borne.

Prevention and Control
Removing any dead or dying material from the plant helps prevent bud rot so does decreasing humidity and increasing ventilation. There are also safe anti fungal sprays from hydro shops that help. If you do find gray mold, cut off the infected part of the plant well above and below the effected area and remove it from the grow room. Decreasing the humidity from 55% to around 40% will make a big difference in preventing bud mold. Also having very big buds can cause bud rot, and would advise watching the areas on your plant that have the biggest, thickest and the more dense buds. Try to have medium size buds rather than having big thick buds. Having a dehumidify around when high humidity days can help as well.

To protect them against bud rot for outside. DO NOT foliar spary at night, doing this the heat will not evaporate the water as well because it is night.
Water the plants in the day instead of so close to being night. Same as foliar spraying.

Make sure your plants are stress free as possible and checking plants often can aid in getting rid of moldy bud before the spores spread onto other areas of the plant! Have a lot of air going around the plants for bad ventilation= sick plants and a breeding ground for spores!

Keep leaves away from soil making sure they do NOT touch the soil.

Keep cooler temps at night while plants are on there down time.

If you have gotten bud rot already the best thing to do is cut off the bad buds discard them away from you’re grow and apply any of the following: Neem oil, Neem2 which is a ready made solution!

Using high ph water for foliar spray prevents them from spreading as well kills the mold. pythium is another good product to use! There are many other chemicals and organics that work, but these are the most popular and they work very very well!

Fungus
Fungus is another problem when you are in flowering, because they are susceptible to a fungus or bud rot. Growing conditions for fungus are best when temps are between 60 and 80 degrees and the humidity is high. The fungus is very destructive and spreads quickly. These kinds of fungus are air borne and can travel to other bud sites. If you already have been infected by them the best thing you can do is cut off and remove the infected area and then discard out of the grow area, then get a hold of some anti-fungal spray and apply.

Fungi can kill your crop quick, so invest in some SAFE fungicide and spray down the plants as much as you can and as soon as you can. The faster the safer.. If you have had problems with fungus before, do NOT spray them you will contribute to the fungus becoming resistant to the spray/chemicals you are using. Try to keep the humidity down to the range fungus do not grow to well in. Keep a good amount of ventilation around your grow, and if you have plants outside, always keep them quarantined away you’re your indoor plants until you know they are safe.

Most fungicides are very nasty and eating them can be very dangerous so its best to use something on them that is safe on plants that you can eat., Safer makes a very safe product that can be found in most stores and hydro shops. it contains only sulfur in solution. Here is a picture of what bud rot looks like when it starts to form.

Control
To control to prevent fungus from forming there are a few things you should do.

DO NOT foliar feed at night, tends to make humidity higher rather than when you water in the day the water has time to evaporate where at night will linger in the air.

Same goes for watering plants at night, wait till the morning or afternoon to water!

Keep a happy plant and will not become prone to infections. Checking plants often can aid in getting rid of any fungus that may attack other leaves and or bud!

Have a lot of air going around the plants for bad ventilation= sick plants and a breeding ground for spores!

Keep leaves away from soil making sure they do NOT touch the soil.

Keep cooler temps at night while plants are on there down time.

If you have already gotten some kind of fungus there are things you can use: neem2, neem oil works wonders!! Potassium Bicarbonate, Baking soda and for other chemical agents you can use Plant Shield, Serenade and pythium! There are many other chemicals and organics that work but these are the most popular and they work very very well!

Pests

This isn’t going to be a long one, just going to talk about what each bug does, what are its symptoms and how to prevent and kill them.

White flys:
They look just like tiny moths and lay eggs on leaves and or top of the soil. They are a pest in big numbers and are not very hard to get rid of, they can cause damage by sucking sap from the plants. Here are some ways NOT to get them: Do not overwater your potted plants. Allow the soil to dry between waterings and provide good drainage. Another one is to put sticky traps up when you think you may have them, that way when they get stuck you can identify them.

If you already have white flys, you can use insecticidal soap, this will help stop them from flying so it wont infect other plants. It also stops them from laying new eggs. If you use the soap reapply weekly. If insecticidal soap does not work too well, there is some other options that are stronger called PERMETHRIN dust, Which can be used during flowering and is safe on ediable plants.

Here are some other good things to use to rid of white flys: PERMETHRIN and biffen (both are safe to use on ediable plants), Spreader sticker ( hich allows to apply the spray to a wider area) Nylar (works well for inhibiting there growth and development) ORTHENE FOGGERS works well for a small area and are safe on the plants.Other poducts you can try are:

Chemicals
Hot Pepper Wax,Safer Yard & Garden Insecticide (which can be used right to the day of harvest),GNATROL( used in hydro in the water as well as soil),Doc’s Neem Pest Soap,Safer Sticky Stakes,TR-11000 Pyrethrum.

Symphilids
Small pests that are tan to white colored and look like centipedes. They are very deadly to the plants, because they burrow down into the roots and damage them by feeding of them. Your plants leaves will begin to die off. They are found mostly in soil composites that have not been cleaned, like soil that has additives in them such as animal manure. (I know it will smell funny but sterilizing the soil in the oven for 30 min can kill any pests in the soil, heat to 350 for 30 min.) They are easy to tell if you have them, because they come to the top soil when your plant is being watered, if you find you do have them, use Fungus Gnat Killer (“B.T.” a non-chemical,biological control) in the powdered form. One application should kill it, just to be safe repeat every 7 days to kill off the larvae. Tobacco juice kills them as well! And nematodes.

The following image shows the Symphilids look like.

Fungus Gnats
Fungus gnats like to feed on roots of the plants and organic matter. Adults and larvae live in moist, shady areas. The adults lay there eggs on top of the soil, near the base of the stem and takes about 4 days to hatch. The larvae will start by eating the root hairs of the plant then working their way up the plant, Fungus gnats like to eat organic matter so they will be stealing away nutrients from your plants, so its best to get rid of them completely.

If plants are outdoors, check the soil of plants before taking them back indoors for adult gnats or their larvae.

Prevent indoor entry of gnats by making sure there is no open windows open without screens on. Aug is a bad time for them as they are worst that time of the year.

Put sticky traps on the soil surface to trap the gnats

Put potato slices on the surface of the soil. The larvae like it and will be drawn to it.. After about 4 to 5 days, remove the potato slices with the larvae. To get rid of them you can do a lot of things like either use a NO pest strip, neem oil or putting sand on the surface of the soil will suffocate the eggs and get rid of them as well. Tobacco juice kills them, and works well for re-occurrences!

They can be in or on the soil and can fly. In order to get rid of them you can use neem oil, sand on the surface again kills them, and no pest strips catch the ones that fly. A chemical product called Zone works very well and is very powerful and works well in hydro!

Other Products which can be used in hydro and soil are:
Chemicals
Hot Pepper Wax,Safer Yard & Garden Insecticide (which can be used right to the day of harvest),GNATROL( used in hydro in the water as well as soil),Doc’s Neem Pest Soap,Safer Sticky Stakes,TR-11000 Pyrethrum.

The first picture shows the gnat. The second shows its larvae.

Spider mites:
Spider mites are by far the worst pest to have, because they are the hardest to kill and can literally kill any plant. They are by far more active in warmer climates than cold ones, they also suck sup from the leaves leaving tiny white spots on the leaves from where they suck on. The damage they do is just like thrips, but with spider mites they pierce the surface of the leaves and can show tiny holesor white speckling damage, unlike with thirps they eat the surface of the chlorophyll. You can tell when you have infestation of spider mites , because you will have distorted growth, shortened internodes and petioles.

When you have bad infestation you will see webbing with larva in them. You get spider mites from either store bought soil mostly when your soil is not sterilized. Most brands do not state weather or not they are, chances are if you buy cheap soil, you have a less likely chance of the soil being sterile.Also, bringing outdoor plants indoors, or getting plants from someone else who was infected with spider mites.

Spider mites live on the plant itself and are under the leaves most of the time and are usually are so tiny you can’t see them with the naked eye. In order to get rid of spider mites one of the best ways to start to get rid of them is to use NO-Pest strips.NO-Pest strips work well and should always be used with other methods. Neem oil helps get rid of them as well. Also by raising the humidity in your grow room a lot will kill the spider mites off, by them absorbing to much humidity and will burst. You can use soap solution like Safer Insecticidal Soap to get rid of most aphid problems. Use some tobacco juice and chili pepper powder added to this for mites. (see below how to make tabacco juice)

Pyrethrum should only be used in extreme circumstances directly on plants, It starts to breaks down around a week and is easily washed away with clear water or. If your plants are in flowering and you have spider mites, using safer chemicals is your best bet. The tobacco and pepper soap solution works well and should be used daily, spraying on the underside and top leaves and later the whole plant. Since spider mites are very residual to common products, you have to find or try any number of ones untill you get rid of them. make absolutly sure you retreat as stated, other wise you will get resistant spidermites and then you have a bigger battle on your hands.Also do not allow pets that go outside alot to be around indoor plants,mites have been known to be carried in from pets to plants. PLEASE NOTE, below are ways to get rid of spider mites, but no 2 mite infestations are identical, you almost always have to use different products to get rid of them, also make a habit to check for at least a whole month after thinking you got rid of them, that way your chances of the spider mites that became resistant breeding and then having a bigger problem. Make sure you spray your plant down very good and enough and on time.

Here are some more products that may help get rid of spider mites:

Chemicals
Hot Pepper Wax,Safer Yard & Garden Insecticide (which can be used right to the day of harvest),GNATROL( used in hydro in the water as well as soil),Doc’s Neem Pest Soap,Safer Sticky Stakes,TR-11000 Pyrethrum. Anything that says dicofol on the back. ( should be used in vegging or early flowering)

Tobacco Juice recipe

Take 3 strong cigarettes soak them over night in water
Boil it for 2 to 3 minutes, let it cool off and spray the plants 3 to 4 times a week. You can add safer soap if you like to the mixture.
(make absolutely sure you use gloves/face protection while handling and spraying)

Neem oil works very well too!!

The first picture shows spider mites and their larva. The second shows spider mite damage. The last picture shows Spider mites larvae and spider mites closeup.

Thrips
Thrips are really tiny, but can be seen by the naked eye. Some may have wings and some may not. Thrips reproduce rapidly, especially in tight places. That is what makes them hard to get rid of when using pesticides. The suck the sap right out of your plant with there piercing mouths, which makes the leaves look like they turned white. You can tell when you have thrips by taking a look at your leaves, the leaves will look as if there chlorophyll have been ripped right off the plant. Plants that are damaged can’t be healed thus making it harder for the plant to absorb light. so if left untreated the thrips will kill the plants. Damage also can be seen by the greenish black specks of there poop they leave on leaves. Also the plants will show silver patches from scar tissue. Depending on the severity at first, thrip damage might look like spider mite damage until it increases in damage and then thrips case is for sure when you see the greenness replace with big parts of white.

One good way to repel thrips for those growing outside is to use garlic, this is a good way to keep them away before you get them. The color yellow attracts the thrips and should be advised not to have this color around your grow. If you already have them using neem oil, and or lady bugs can get rid of them. If the infestation is bad then you need to use biological solution like, pyrethrin-like insecticides.

Other Products include:
Chemicals
Hot Pepper Wax,Safer Yard & Garden Insecticide (which can be used right to the day of harvest),GNATROL( used in hydro in the water as well as soil),Doc’s Neem Pest Soap,Safer Sticky Stakes,TR-11000 Pyrethrum.

The first picture shows Thrip damage. The second picture shows Thrip Larvae.

Caterpillars (cutworms, cabbageworms, ect.)
Chewed leaves. Damage: Most caterpillars feed on plants of some kind, they can feed on wool and hair (the clothes moth) Some are pests in gardens and yards. The leaf roller caterpillars can cause some severe damage of trees and shrubs, while others, such as cabbage loopers, and cutworms can cause severe damage to gardens.

If you find caterpillars have been eating at your plants,garden and you need to get rid of them are several non-toxic and least toxic methods to choose from.

Controls
Hand picking: Easiest way to control them is to pick them up and knock them into a bucket of soapy. If you are scared about handling caterpillars, you can use some gloves or have someone else pick them up for you.

Chemical:
BTK in dust form can be used to kill caterpillars. BTK can also be used to foliar spray your plants. One tablespoon of neem oil added to your BT mix helps stick the mix to the plants better when you are foliar spraying.. BTK is available in liquid form. Apply BTK on all of the leaves both top and underside If you decided using the dust kind,spray your plants down with water before you apply the dust Apply every week to 2 weeks and or after it rains. The caterpillars must eat the BT as they are feeding on foliage in order for the caterpillars to be rid of.

Organic:
Insecticidal soaps, neem, oil, and spinosad are the safest insecticides that can be used to control.. Soaps and neem are non-toxic and are great to use when you have a lot of pets and want to be friendly to nature and its animals. Spinosad works very very good in controlling the caterpillar population and is non toxic to wild-life, pets, and humans. It hardly has any impact at all on the plants.

The following illustrates damage from caterpillars.

Slugs and snails (Outdoor Growers)
Both slugs and snails travel by secreting a mucus or slime on which they glide. When you see the slime trail on your plants and have damage, then it was most likely caused by slugs or snails.When your garden is very moist slugs and snails can live for a long time as this is the key to them living a long time. If you keep your garden not as moist and dark slugs and snails cannot live as long. They stay away from the sunlight along with hiding around moist dark areas in the garden.They also hide in Mulches, short stubby plants, boards, and in the soil. They come out mostly at night and on cloudy days. They feed by chewing holes into your leaves and can clip the edges of leaves and flowers.Slugs and Snails are mostly pests of seedlings and herbaceous plants that are close to the ground. In order to confirm the damage was caused by slugs or snails, look for a silvery trail of mucous.

Controls
Snails can cause massive damage to gardens if given a chance. It is very unlikely you will be able to completely rid your garden of them, but try to keep the numbers down as much as possible to keep healthy and undamaged plants. Here are some ways to control slugs and snails.

Reduce slug and snail damage dramatically by watering in the morning instead of the evening.

If you do see any slugs or snails avoid putting mulches and dark hiding cover.Oak leaf mulch will deter slugs and snails.

Handpick slugs and snails at night. Use a bucket to put them into soapy water. Lay boards down in the garden to trap slugs and snails.

Diatomaceous earth sprinkled around you’re your plants base of the stems will help keep out slugs and snails, but it can also stop other beneficial insects.

Soak the soil with wormwood tea.

Put copper wire around your garden or at the base of your.Slugs get a big shock when they touch copper Just make sure you don’t trap them inside your garden when you put copper around your garden.

Beer is good to use, because slugs love beer!. Take a container of beer and bury it in your garden with it just barly above the ground so they can drink it and drown.

And one of our favorite additives …. SALT!

Predators that like to eat snails include:snakes, toads, frogs,fireflies, predatory snails, birds, beetles. The large, black iridescent beetles you see in your yard are predators. Firefly larvae eat on slugs and snails and can literally wipe out the development of them by eating 40 to 60 snails from just 1 larvae of a firefly!!

Please be kind to nature and pets and stay away from poison slug bates. If you have seen what it can do to pets you wouldn’t want to ever use it again!!!

Poisonous baits are hazardous to all living beings and animals. Slugs and snails can become resistant to baits. So its better to use other methods and stay away from chemical baits, all the while protecting nature.

Leaf miners
These Little creatures are a pain to get rid of, the miners eat and dig squiggly lines into your leaves all the while planting there larvae in them making it hard to get rid of them. They plant there eggs in the leaves in mid When they hatch they feed off of your leaves untill they get big enough to pupate. Pupation occurs within the leaf or in the soil beneath the plant. After they emerge the entire cycle will start over and you will have a bigger infestation.

Controls
Controls: Natural control for these insects is difficult. You can remove affected leaves and discard them. Chemical control is hard and is ment towards the emerging adults. Since the larvae is well protected within the leaf. Neem oil will work well.

The following images illustrate leaf miners attack

Scale (Outdoor Problem)
Scale can be found on stems, underside of branches, trunks, young trees or shrubs. They usually emerge from there eggs around March to Aug and make there homes on the plant. They pierce the cells and feed on the sap of the plant. After they have a place on your plant they develop a very hard shell which protects them from other predatory insects and chemical compounds to get rid of them. After they develop this hard back the secretion they drip attracts ants. Now since the ants travel over the scales thus dragging it all over your plant spreading the scale from one place to another on the plants. When the secretion falls on leaves it can make a type of mold called Sooty Mold which makes the leaves look dirty and black.

Sooty MOLD
The problem with this type of fungi is that it attracts several types of sucking insects,like Aphids, Mealy Bugs, Thrips, and Whiteflies..This mold is so dark that it affects the plant by inhibiting the light from reaching its leaves which stops photosynthesis, which in turn makes the plant die.

Control
The waxy layer that is on scales protects them from insects and other pesticides. In order to get rid of them Use a horticultural oil to kill the adult populations throughout the year. If you can combine the oil with the insecticide, such as, Orthene, Sevin, or malathion it can almost wipe out the scale population along with the sooty mold it causes! Neem soil works very well too!

You can do a few things more if you’re not nearing the end of harvest.

1) take a pack of chewing tobacco, mix it with a gallon of water, let it brew for a day.. spray the plants down as needed.. if your a cigarette smoker no worries spray em down till harvest.. watch for mold.

2) take some safers natural soap, mix it with some water so its a soapy slippery mixture, soak em down.. the idea is to suffocate the bugs in the soapy bubbles..

Miscellaneous Sick Plant Troubles

This picture is caused by temperature changing from cold to warm, cold nights and warm days.

Some varieties, like equatorial sativas, don’t take well to cold weather. If you can keep the roots warmer, the plant will be able to take cooler temps than it otherwise could.

This picture is what light bleaching/ light burn looks like. Only way to fix this is to Move the lights away from the plant! Or make sure you don’t go over 75 watts a sq foot, or your plant will have too much light and light bleaching can occur anywhere on the plant. (indica species seem to bleach easier than sativas imo.)

The following two pictures is what heat stress looks like. Only way to fix this is to Move the lights away from the plant! And get better ventilation, and or add more fans! Heat – If the lights are too close to the plant, the tops may be curled, dry, and look burnt, mimicking a nutrient problem. Your hand should not feel hot after a minute when you hold it at the top of the plants.

This is the most common and loved nuteburn
Ahh, nute burn! Stop this by not adding to much chemical/organic nutrients to your water,foliar feeding. DON’T feed more than 1 time a week, use 1/4 strength for first feeding and then go up to 1/2 strength from then on when using chemical nutrients. Its very easy to overdo it. Causes leaf tips to appear yellow or burnt. To correct soil should be flushed with three gallons of water per one gallon of soil. NEVER give nutrients to plants that are under 2 weeks of age, at this age the soil nutrients are enough to supplement them until 2 weeks of age or more depending on how good your soil is. Using ferts before 2 weeks will almost likely kill your plants.

Stem Problems
Stem Breakage – Everyone from time to time has had this problem or will. This is when your stem is broken. Stem breaks can come from a number of things: training, dropping something on it, animals, weather. No matter how it happened the most important thing is to not panic.

Solution – Fixing this is not really a problem. Splint it with something and tape it in place. marijuana has a great ability to come back even after a stem break. Give her a week or so to recover before she will start to grow again. And be more careful next time!

Misc things to know!!

When your humidity is low your leaves can become shriveled. Using humidity around 40-60% is fine for vegging and flowering.

If your plants are stretching than it can be caused by a few things. Not enough light, or it’s the wrong kind of light. Stay away from incandescent bulbs they produce more heat than good. Same goes for halogens, they are worthless and cause more heat than anything else. Instead get a HPS, MH, Fluros or some compact fluros! Hps will keep your plant short and stubby while cool fluros will keep your plant bushy, while soft white will keep your plant tall, Having a mixture will have a tall and bushy plant! Nothing wrong with having mixed spectrums! Or just go grow outside and save energy!!

Yellowing leaves on cuttings
When unrooted clones start to yellow it means they are either not touching the rooting medium good enough, too much co2. The vast majority of the time, an unrooted cutting will begin to yellow some of it’s leaves, starting with it’s largest oldest leaves, because it is too close to the lights and it needs to be moved farther away. Some yellowing is normal just as the cutting begins rooting and can be a sign of the cutting using it’s oldest leaves as a food source while it is forming new roots. Plain tap water that is ph adjusted is just fine until the clones have rooted. Giving any ferts will kill them untill they have been rooted.

PPM = parts per million
EC = electric conductivaty
TDS = total desolved solids

If you are running in hydro its good to change your water every 2 weeks to keep out bacteria growth and to keep your plants with a good supply of fresh water.

A good rule to go by for how much PPM each part of your plants growth has is as follows:

Seedlings should be around 50-150 PPM
Unrooted clones to be around 100-350 PPM
small plants to be around 400-800 PPM
large plants to be around 900-1800 PPM
Last week of flowering use plain water.

If you see dark or patchy spots on your leaves, that could mean you have mold. Check fordark patchy areas on the leaves and if you do have mold, lower the humidity and get a better ventilation setup going to prevent further occurrences.

And most important..KEEP YOUR GARDEN CLEAN!!

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  1. […] We’ll cover bugs, mold, ph and watering problems in a new thread of Marijuana Plant Problems Part 2. […]

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