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I've had a problem with whiteflies for years. I've gotten it under control somewhat by removing some of the plants that were most susceptible, removing infected foliage when I can, and by spraying the worst infestations with insecticidal soap. That's way too much work.
My Texas Bug Book says that whitefly infestations usually mean that your soil is low in phosphate and that if you add colloidal phosphate, you won't have a problem anymore. OK, great, where do I find this phosphate? Please help! Thanks!
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