I have little green caterpillars eating my broccoli leaves. I used a garden dust "seven" and then the next day I saw a large amount of green caterpillars all on the ground dead or dying under the plants. I watered with miracle grow liquid vegetable food to get all the dust off all the plants. What do I do about the almost fully eaten leaves? Do I dust again in a few days? This is my first real garden and these are things I'm not sure on.
Certified GKH Gardening Expert
You will need to use an insecticide with Bt.
Here is a link with more information.