Abstract
When peach trees were sprayed with chemical defoliants to control green peach aphids, Myzus persicae (Sulzer), the number of aphids per leaf was higher on leaves remaining on the sprayed trees, but the number of aphids per tree was higher on the unsprayed trees. The high density of aphids per leaf in the foliage still present on sprayed trees was associated with an increase in deposition of syrphid eggs per leaf. Also, the number of aphid eggs was significantly fewer on the sprayed trees than on the unsprayed trees. The decrease in deposition of aphid eggs in 1966 compared with 1965 was correlated with the differences in trends of aphid population, temperatures, and syrphid activities.
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