Abstract
In New Brunswick, populations of Myzus persicae (Sulzer) on potato and weed hosts appear to be composed of anholocyclic races that have overwintered as parthenogenetic viviparous females in greenhouses, storage cellars, and other protected places. In adjacent Maine, U.S.A., holocyclic races that have overwintered as eggs on Prunus nigra Ait. are reported to be predominant in the population on potato. Holocyclic races of M. persicae are seldom encountered on P. nigra and potato in New Brunswick.

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