It doesn’t work against every type of bug, but this is one of the most effective ways to kill caterpillars and won’t hurt most beneficial insects. As a bonus, it can also kill some other cannabis pests like worms and moths.
If you see caterpillar damage, try a “BT” spray. It’s very safe and makes it so caterpillars can’t eat.
Apply a caterpillar BT spray as soon as you see leaf damage, caterpillars or caterpillar poop. BT sprays work best on small caterpillars that are actively eating your leaves. Repeat every week for as long as you’re still seeing caterpillars, though you can give BT more often if there’s a heavy infestation. Make sure to thoroughly mist both the tops and bottoms of leaves and apply again after a heavy rain (since that will wash the BT away).
Recommended: Monterey BT Spray
(though any caterpillar BT product will work!)
Or save some money in the long run by getting the
concentrated version with a
mister.
Since BT is harmless to humans, you can use BT products up to the day of harvest! One thing to keep in mind is BT spray almost instantly stops caterpillars from being able to eat, but doesn’t kill them directly. So, although you may see the caterpillars alive and apparently unharmed after spraying, the BT is still doing its dirty work because they’re slowly starving to death.
