Pest Control

For each pest I'll address:

  • How they tend to get into your area.

  • What damage they do.

  • How to spot them.

  • Common supposed to be remedies, products, and practices that don't work well, so you can avoid or use knowing what to expect.

  • Remedies, products, and practices in both: Bio-Chemical Warfare and Non-chemical style that work well.

I'll stick with products that seem generally acceptable in the growing community since there is nothing around yet that's approved for cannabis. Use any or none of these at your own risk. Whats considered safe in something you eat may not be safe at all in something you smoke. I'll also include some products that are for use only in your house plants and other gardens that will greatly reduce the number of pests that could work their way to your cannabis grow area.

I have used Amazon affiliate links which means if you buy something through links on this site I may get a small percentage of the item cost, this doesn't cost you anything.

General rule: If you have a garden never go from it to your indoor grow area, you're bound to have hitchhikers.

Here is a list of the most common cannabis pests. Each is a link to a section on this page:

Fungus Gnats

Entry: These usually come in with your potting mix so be sure to open the bag outside and inspect it. When buying potting mix get it from a retailer that stores it inside in a climate controlled area. This will ensure its dry and pest free. If its stored outside and gets rained on you're almost certain to find fungus gnats flying out of the bags.


If you get an infested bag or are concerned your bag might have eggs here are the things I tried that did not work even though many sources said they would. I hope this saves you some time:

  • Baking it in batches and holding it at 190deg F for 45min.

  • Mixing the soil with boiling water.

  • Leaving it in the cars trunk during summer time for a few days.

  • A week in a large outdoor solar oven made from a black trash can and a clear sheet of plastic.

  • laying the soil out in a thin layer on a tarp in the sun to fully dry it out.


The eggs are extremely resilient and dirt is amazing at dissipating heat so its very hard to evenly heat leaving plenty of cool pocket where the eggs survive.


What did work:

Forgetting about the soil in the solar oven and finding it a year later. Like a charm.

Placing it in out door pots I didn't care as much about and using a product called Mosquito Bits which contains a form of BT that works on fungus gnat larva.


Damage: The gnats themselves are fairly harmless aside from laying around 300 eggs each! The eggs hatch when conditions are optimal and the larva feast on any fungus in the soil as well as plant roots. So a bad infestation can start to look like watering issues.


Spotting: You'll see them clumsily flying around near the soil level. They multiply quickly.


"Remedies" that don't work well but can help:

  • Dousing the soil with hydrogen peroxide.

  • Removing the top 2" of soil from your pots.

  • Covering the soil with an inch or more of sand.

  • DE on the soil surface, it does kill emerging gnats but so does laying sticky traps flat on the soil.

Remedies:

Prevention:

  • Don't over water. The eggs need moisture to hatch and the larva need moisture to live and feed on fungus and roots. If you can let the top two inches of soil dry out between watering the fungus gnat problem may be avoidable.


Bio-Chemical Warfare:

  • Mosquito Bits & Sticky traps. The active ingredient in Mosquito Bits® is a biological larvacide called BTI (Bacillus thuringiensis subspecies israelensis). BTI is a naturally occurring bacterium that’s deadly to both mosquito larvae and fungus gnat larvae. This is not the same BT used on caterpillars.


Non chemical:

  • Beneficial Nematodes and sticky traps. The nematodes will eat up the gnat larva and the sticky traps catch any adults ideally before they can lay new eggs.


(click pictures to check price and or buy at amazon)

Mosquito Bits are very effective. I don't usually add them to my potted plants but I make a tea with them and water with that.

Benifical Nematodes Pot poppers are added to the soil when its moist. These Nematodes will spring to life and eat up the fungus gnat larva living in the soil. Once the infestation has settled down its best to add new bags and water them in to really finish off the problem. One box is enough for most gardens.

Yellow Sticky Traps are a must have to trap the adults gnats. For best effect lay them over the soil so as adult emerge they are trapped before laying eggs. These are a great detection method as well. Put some out when you have no issues.

Diatomaceous Earth (DE) is made of the naturally occurring fossilized remains of diatoms, a type of algae that forms in freshwater. These remains are ground up into a soft, fine white powder. This powder is ultra spiky and gets jammed up in bugs exo-shells. This will kill emerging gnats. but has to be reapplied after every watering.

(I use sticky traps)


DO NOT BREATH THIS.

Thrips

This is a thrips on the on the point of a finishing nail taken with the 1000x microscope found in the "nice to have" section of the equipment page.

If you've ever had thrips on a plant that meant a lot to you then you'll appreciate this video of one being satisfyingly blasted off a basil plant with Bonide Insect Soap

Entry: These are hard to avoid once you know what damage to look for you see them in every outdoor garden. To avoid them you'll want to keep lawn mowers and yard debris away from your grow area. If you walk through a garden or cut grass take your shoes off before going in your tent. Once the get in the adults sow eggs into the flesh of your plant usually where leaves meet stems. This makes them hard to kill as the life cycle restarts if any adults survive.


Damage: Leaves will turn yellow, eventually dry up, and fall off. Left untreated the plant will usually die.


Spotting: You may see adults flaying around the look similar to fungus gnats but fly better. Effected leaves will be turning yellow and often have black tar like speckles of poop on them. Under a magnifying loop you will see light colored larva on the leaves and possibly preflying nymphs crawling around the leaves.


"Remedies" that don't work well but can help:

  • Neem Oil

  • Sesame oil


Remedies:

Prevention:

  • Quarantine new plants for a week well away from your grow area to be sure no thrips hatch out.

Bio-Chemical Warfare:

  • Spinosad works on contact and through roots as a systemic weapon killing any thrips in the soil and that feast on any part of your inoculated plant. (not used by commercial growers) Couple this with yellow and blue sticky traps.

Non chemical:

  • Bonide Insect Soap made with potassium salts of fatty acids from plants kills insects on contact. Ideal for houseplants, vegetables, flowers, & fruits. Suitable for organic gardening. Couple this with nematodes to eat any thrips larva in the soil and sticky traps to catch the flying adults.


(click pictures to check price and or buy at amazon)

Spinosad Concentrate is effective with little to no odor or visible residue. It kills both on contact and systemically so commercial growers do not use this. Apply in low light and in accordance with the products literature.

Bonide Insect Soap is effective with no odor or visible residue. It only kills on contact so spray the top and bottom of every leaf, stem, and branch. Apply in low light and in accordance with the products literature. Apply every few days until all aphids are gone. (Featured in the video above)

Benifical Nematodes Pot poppers are added to the soil when its moist. These Nematodes will spring to life and eat up the thrip larva living in the soil.

Yellow Sticky Traps are a must have to trap the adult flying thrips. For best effect put them just over the plant canopy to catch emerging adults.

Blue Sticky Traps are a must have to trap the adult flying thrips. For best effect put them just over the plant canopy to catch emerging adults.

Neem Oil is derived from the neem seed, for use on roses, flowers, vegetables, fruits, herbs, indoor houseplants, trees and shrubs. It's approved for organic gardening. It kills on contact and kills surface eggs.

Aphids

Entry: These usually hitchhike in on you or your pets. If you have poplar trees in your yard these can be very difficult to avoid in the summer time. They infest poplar trees to where it seems like its raining when your sit below. There will be sticky sap all over.


Damage: Aphids suck leaf sap and excrete a clear sticky waste substance called honeydew. out leaving a damaged dried up plant leaf


Spotting: You'll see them walking around the plants and sometimes clustered on the bottom of leaves.


"Remedies" that don't work well but can help:

  • Crushing by hand. Sure this works if there are only a few but these bugs multiply fast missing a few will have you squishing loads again a few days later.

  • Neem Oil - This does work but other things work as well without smells or residues.


Remedies:

Prevention:

  • shake your cloths out before going in your grow area. Treat poplar trees with

Bio-Chemical Warfare:

  • Bonide - Annual Tree and Shrub Insect Control with Systemaxx

One application kills insects and prevents new infestations for an entire year. Spray or mix and pour at base of plant/tree. The systemic insecticide is absorbed through the roots to all parts of the plant, even new growth, and won't wash off. For use on listed fruit, nut and ornamental trees and shrubs. Do not use in your cannabis, instead use it on plants and trees near by.


Non chemical:

  • Bonide Insecticidal soap made with potassium salts of fatty acids from plants kills insects on contact. Ideal for houseplants, vegetables, flowers, & fruits. Suitable for organic gardening. Couple this with ladybugs to eat any aphids hidden from sight and crush the ones you can see.


(click pictures to check price and or buy at amazon)

Bonide - Annual Tree and Shrub Insect Control works perfect to treat poplar trees or other shrubs near your grow area to keep the aphids away. This is not for use on cannabis instead use it on the trees and plants near by.

Bonide Insect Soap is effective with no odor or visible residue. It only kills on contact so spray the top and bottom of every leaf, stem, and branch. Apply in low light and in accordance with the products literature. Apply every few days until all aphids are gone.

Neem Oil is derived from the neem seed, for use on roses, flowers, vegetables, fruits, herbs, indoor houseplants, trees and shrubs. It's approved for organic gardening. It kills on contact and kills surface eggs.

1500 Live Ladybugs Ladybugs will feast on aphids. The battles will be epic. Send in the knights! Keep in mind ladybugs can be their own kind of pest just not for your weed plants. These are best outdoors or well contained in tents. don't let them move into your house.

Mites (Spider Mites, Russet Mites, Broad Mites)

These are spider mites Russet and Broad Mites can not be seen with the naked eye.

Entry: Spider mites usually come from new plants brought from outside sources or hitchhike in on you or your pets.


Damage: Spider mites attack a plant similarly to aphids above. They bite the backs of leaves and suck out its leaf sap. This results in small brown or yellow spots on the leaves which will yellow in full as their nutrition is leached by the mites. If the population is left unchecked they can quickly destroy the whole plant.


Spotting: Often, with Spider mites, you'll see some spider webbing around the plant before you see the mites on the underside of the leaves. You should regularly check the underside of leaves to catch these pets ASAP. However, Broad and Russet Mites are much harder to spot and you'll usually only see the damage they cause. Often, even when armed with a scope, people will swear up and down that they can't find any mites until the infestation is so bad that its too late to effectively treat. The best thing to look for is white colored eggs on the backs of leaves blending in with the stomata. Sometimes, it helps to poke around with a needle or unfolded staple to determine if the white dot is a part of the leaf or eggs.


"Remedies" that don't work well but can help:

  • Weekly soapy and water spray (3tbs dish soap per gal of water)

  • Alcohol and water mixed 1:3 (1 part alcohol to 3 parts water) to start. Soak a cloth and wipe down each leaf. If the plant tolerates this then move to 1:2. If your plants tolerates this then next use 1:1. applications should be done every other day for a week then as you see mites or eggs.

  • Neem Oil - This does work but other things work as well without smells or residues.


Remedies:

Prevention:

  • Shake your cloths out before going in your grow area. Quarantine new plants before bringing them into your grow area.


Bio-Chemical Warfare:

  • Miticides - There are a lot of these. Most can be used on non-consumable plants near your grow area. But the spider mites are resistant to many and may become resistant after several applications. I don't use these for cannabis... this invader has to be fought on the ground.

Non chemical:

  • Bonide Insecticidal soap, be sure to apply it daily until you've wiped out the mites.

  • If you want something you can use during flower then look at Trifecta and Grower's Ally spider mite control. both may not be as effective as insecticidal soap but are blends of consumables like alcohol, vinegar, herbs and oils that may not mess up your weed.

  • Predatory mites - These you can use at any time and they will generally knock down most infestations to where they're not noticeable and can be eradicated with a more mild foliage spray solutions


(click pictures to check price and or buy at amazon)

These predatory miteswork on; Two Spotted Spider Mites, Broad Mites, Rust Mites, Russet Hemp Mites, Cyclamen Mites and Southern Red Mites and other species of mites

Trifecta is used to protect against and cure Powdery Mildew, Spider Mites, Russet Mites, Broad Mites, Botrytis, Grey Mold, Aphids, fungal and parasitic species on plants.


This product is mostly alcohol and vinegar mixed with some plant oils and may be one of the better options for consumable plants.

Grower's Ally Spider Mite Control is a blend of rosemary, clove and peppermint oils.

Bonide Insect Soap is effective with no odor or visible residue. It only kills on contact so top and bottom of every leaf, stem, and branch needs to be sprayed. Apply in low light and in accordance with the products literature. Apply every few days until all aphids are gone.

Neem Oil is derived from the neem seed, for use on roses, flowers, vegetables, fruits, herbs, indoor houseplants, trees and shrubs. It's approved for organic gardening. It kills on contact and kills surface eggs.

Whiteflies

Entry: These "flies" don't handle the cold well so they're found outdoors seasonally and often find their own way indoors and into greenhouses.


Damage: Just like aphid above, whiteflies bite plant leaves and suck out the leaf sap leaving behind honeydew. As the infestation grows the plant will wilt and start turning yellow.


Spotting: You'll see them on the bottom of the leaves and they'll scatter around when your brush into the plant leaves.


"Remedies" that don't work well but can help:

  • Washing them off with water. This just causes them to scatter and lay eggs elsewhere.


Remedies:

Prevention:

  • Ladybugs will prevent or significantly knock down a whitefly infestation.


Bio-Chemical Warfare:

  • None needed


Non chemical:

  • Start with a Vacuum. You'll easily suck up the swarm as it tries to fly away. Follow this up with Bonide Insecticidal soap. be sure to thoroughly wet all leaves this will take care of remaining eggs and larva. repeat every three days until there is no evidence of the pest.


(click pictures to check price and or buy at amazon)

1500 Live Ladybugs Ladybugs will feast on aphids. The battles will be epic. Send in the knights! Keep in mind ladybugs can be their own kind of pest just not for your weed plants. These are best outdoors or well contained in tents. don't let them move into your house.

Bonide Insect Soap is effective with no odor or visible residue. It only kills on contact so spray the top and bottom of every leaf, stem, and branch. Apply in low light and in accordance with the products literature. Apply every few days until all aphids are gone.

Snails & Slugs

Entry: These soft-bodied mollusks usually come out in the evenings especially if its damp and humid.


Damage: They tend to eat holes or whole portions of fan leaves. The damage quickly adds up and can really slow your plant growth down or damage yields if you're in flower.


Spotting: You'll often see the shiny mucous trail they leave behind. If you want to catch them in action to handle the issue yourself, you'll want to start looking for them in the late evening.


"Remedies" that don't work well but can help:

  • Pouring salt around your pots.

  • Diatomaceous Earth


Remedies:

Bio-Chemical Warfare:

  • Slug & Snail Bait - Garden Safe Brand's contains a combination of iron and phosphate with slug and snail bait additives. After eating the bait, the slugs and snails stop feeding, become less mobile and begin to die within three to six days.


Non chemical:

  • Loosely wrap copper mesh tape around the base of the plant stem. Snails and slugs are extremely deterred by copper and will rarely if ever slither over it.


(click pictures to check price and or buy at amazon)

Slug & Snail Bait is the most effective. means of ridding these pests. They need to be replaced after it rains or once a week. I put this on the ground around the pot, not in the pot. If you're planted in the ground, toss the bait near the plants but not right under them.

Copper mesh tape is a copper mesh wool material that is rust-proof and stain-proof. Each roll is 6 inches wide, double folded and 20 ft long

Diatomaceous Earth is made of the naturally occurring fossilized remains of diatoms, a type of algae that forms in freshwater. These remains are ground up into a soft, fine white powder. This wont kill the snails or slugs but does deter them.


DO NOT BREATH THIS.

Caterpillars

Entry: These soft-bodied larva are usual left behind as eggs by moths and butterflies. Typically not a problem with small indoor grows but if outdoors or in a green house they can be a real problem.


Damage: They tend to eat whole portions of fan leaves. The damage quickly adds up and can really slow your plant growth down or damage yields if you're in flower.


Spotting: Their poop usually give them away. If you see leaf damage be sure to keep an eye out of small BB size pelts typically in clusters where leaves meet stems.


"Remedies" that don't work well but can help:

Pouring salt around your pots.

Diatomaceous Earth


Remedies:

Bio-Chemical Warfare:

  • Skip the chemical warfare, there is a non-chemical bio-weapon that's natural and perfect, see below.


Non chemical:

  • BT Spray - This is a bacteria that infects caterpillars and stops them from eating. This is not the same strain of BT found in mosquito bits which controls fungus gnats and will have no effect on them.


(click pictures to check price and or buy at amazon)

BT Spray should be reapplied any time it rains.