Abstract
Systemic insecticides applied in the row with lettuce seeds gave promise of significantly reducing the incidence of aster yellows virus, Chlorogenus callistephi Holmes, vectored by the six-spotted leafhopper, Macrosteles fascifrons (Stal),(Thompson and Rawlins 1961). The virus causes a debilitating disease in lettuce and in a myriad of other plant species, resulting in losses of considerable magnitude. The systemics applied with the seeds are absorbed by the roots of the growing plants and translocated to the foliage. M. fascifrons adults succumb after feeding on treated plants and few or no nymphs are produced.
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