Here are the easiest ways to remove caterpillars. Physical removal: caterpillars are perfectly visible to the naked eye. Unlike aphids, they are easy to spot. If you’re only dealing with a handful of specimens, simply pick them up, place them in a jar, and relocate them to a nearby natural setting. Many species are nocturnal, so prepare yourself for some nighttime hunting. Bacterial sprays: These natural pesticides contain bacterial species that harm caterpillars, without posing a risk to cannabis plants or the people that smoke them. Avoid administering these sprays too close to harvest time. Formulas containing Bacillus thuringiensis will do the trick. Hopefully, I answered your question and remember Happy Growing and Free your mind one puff at a time.