Comparative Susceptibility to Insecticides of Two Green Peach Aphid Populations, Collected 16 Years Apart1

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Abstract
The susceptibility to parathion, malathion, diazinon, and lindane, of two straius of the green peach aphid, Myzus persicae (Sulzer), one field-collected in California in 1961 and the other reared for some 16 years in the laboratory without intentional exposure to insecticides, was compared by a leaf-dip method. The field strain demonstrated 4.7- and 11-fold resistance to parathion at the LC30 and LC95 levels, respectively, over the laboratory strain, Tolerance to malathion, diazinon, and lindane was elevated but the slope of the dosage-mortality regression lines suggests this is due primarily to vigor rather than to physiological resistance. Rearing of this field strain in the laboratory for 9 months resulted in partial loss of resistance.