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Oil for mosquitoes?

Q: In “Eastern and Western Equine Encephalomyelitis” (In Brief, EQUUS 479), you suggested methods to control standing water, which mosquitoes use to reproduce. As I understand it, mosquitoes don’t fly far, so control methods focus on the local area. Dumping and replacing standing water in troughs and buckets is effective, but sometimes water stands in places that cannot be effectively