It usually happens every few years when they are so thick and the BT just won't slow them down enough. Before it can work your plants are naked. This is the first time I have ever had to spray okra and only the second time I've ever had to spray it on bell peppers. Usually when they are this bad it is only tomatoes that get ravaged by them. Last year they nearly denuded my single stem tomatoes leaving them susceptible to sunburn despite applying BT ever few days. I finally went with the Sevin and stopped them within a few hours but by then the plants had far too few leaves left to protect the tomatoes. I certainly wasn't going to wait that long on my peppers which are loaded with fruit because they are much worse to get sun scald than tomatoes.
Bill
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