Abstract
Although several insecticides provided excellent control of Myzus persicae (Sulzer), none prevented the occurrence of potato leaf roll virus (PLRV) infection duro ing 4 yr of experimentation. There appeared to be no correlation between populations of apterous aphids in treated plots during a given year and the occurrence of PLRV infection in tubers from the plots. The overall incidence of PLRV infection was highest in years of the greatest aphid populations but appeared to be correlated with the numbers of winged aphids as indicated by catches in Moericke traps.
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