Residual insecticide sprays:These products remain on the plant for a period of one week or more (see product label for recommended treatment intervals). Keep in mind that insecticides kill predators and parasitic wasps as well as aphids, and can make aphid problems worse if used carelessly. Avoid spraying insecticides when possible to preserve these natural enemies of aphids, and to maintain a good long-term strategy for aphid management.


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