I read an old post on tville that I couldn't find again when I searched. It said that "overly rich" soil - whatever that is - will attract insect pests. My soil is so rich that I can hardly use my fertilizer injector without burning everything. I think the whiteflies are another "victim of your own success" type of problem. I'm glad I had the whitefly experience last year, so I can spot them now and kill them before the population spirals out of control.
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