I put the leaf on the left in a plastic bag and the eggs hatched in 5-6 days, producing hundreds of tiny caterpillars
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Great photo and dam nice experiment with the bag.
I wish they were easy to find every time. This is my 3rd season outdoors working with BT. It's the kind of thing where you have to work with the product, see it in action to learn how to best use it. The most important things I've picked up:
-you have to begin applications as soon as the plants are sexed if your running regs
-spraying with frequency. I go every 3-5 days from sexing all the way to a week before harvest. You have to stay on it.
-applying the product. I always take my time, full application including branches and stems right down to where you hit the dirt.
-spray in the mornings before the sun hits them or early enough where the sun is less strong. You want it to dry quickly. Especially full flowers, the less wet outdoor bud gets the better.
When your early and consistent with BT, they can never get a toehold into your plant. In my second season with BT I had a 90% reduction in worms and I lost the 10% because I wasn't thorough with my spraying. It will stop an infestation in progress but by then your really too late. Early and often, live by it ...