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Caterpillars Eating your Cannabis Plants | How to Eliminate & Prevent

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What’s up cannabis growers, my name is Dylan and welcome back to GreenBox Grown! In today’s video I’m going to show you how to eradicate and prevent a caterpillar attack on your cannabis plants. It is important to know how to do this as these bugs can quickly chew through your whole crop in no time. So let’s go see how that’s done!

Caterpillars are a very common pest to outdoor and greenhouse growers and like I mentioned, they can cause severe damage to your crop if not properly taken care of right away. That is why it is crucial to react and treat the situation the second you first see signs. Also, you should always be on the look out for signs of pests and other problems so you can catch it in the early stages and nothing surprises you!

Alright so First things first, you need to know how to properly identify a caterpillar attack before you can even treat it. The first and most obvious signs are if you can spot any caterpillars with the naked eye, crawling around on the leaves or stems of your plants. Since they are green they can be hard to spot with a quick glance, so that’s another reason why I recommend to always be looking over your plants closely. If you do find any caterpillars, simply pull them off your plant and release them back into the outdoors a little ways away from your grow site, so they cannot come crawling back!

The next way to identify caterpillars are attacking your plants is there will be chunks of your fan leaves missing and it will look like actual bites were taken out of them. This is of course because the caterpillars eat the leaves, which eventually causes the fan leaves to die. The final way to tell if there are caterpillars present in your cannabis grow, is by slime trails left behind on your fan leaves. This is an easy way to spot them and will look like a glistening stripe of spit on your leaf. The slime is just a left behind from the caterpillar as it crawls across your leaves and doesn’t actually damage them.

Once you have identified that you in fact have a caterpillar infestation, it is time for step 2 which is to eliminate the bugs from your grow room. The first part of is to do a thorough sweep of your plants and remove any caterpillars you find by hand. Next you can give your plants a lite spray of neem oil mixed with water, and the neem oil bottle will have the proper mixing ratio. Don’t soak your plants with this as it can cause them to wilt.

If you are in flower, you can wipe the fan leaves down with paper towels soaked in this mix so you don’t get any on buds. The idea is this helps prevent any caterpillars from coming back and causes the ones that are there to die or leave. The spray is something you will want to do after the hottest part of the day and at least 3 hours before lights off for your plants. This is how it is most affective. Also you will want to continue the spray each day until you no longer see caterpillars crawling around.

Alright so that is everything you need to know about removing caterpillars from your cannabis grow. If you enjoyed the video please give us a thumbs up and don’t forget to subscribe to our channel! Also feel free to leave a comment below with your feed back. As always, thank you for watching and until next time…


Cannabis growing can seem like a really daunting and expensive activity, but it is much easier than you think! The GreenBox Grown video series breaks down each step of your grow and really simplifies the process, making it easy to follow. You will also learn how to grow on a budget so you don’t have to break the bank to get started! No matter what your growing experience may be, if you follow the GreenBox Grown series, you are guaranteed a successful harvest! Always have a supply of cannabis when you Grow Your Own.
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