Abstract
Interactions among tomato planting date, population growth of the potato aphid (PA), Macrosiphum euphoria (Thomas), and natural enemies were investigated. Studies showed that PA were influenced directly by planting date, and significantly higher aphid densities developed on young plants. Older plants supported low numbers of PA. Plant age also influenced population growth of PA indirectly through the interaction between green peach aphids (CPA), Mazes Persia (Seltzer), and natural enemies. In one season of this study, CPA developed populations on early planted tomatoes, and this population supported parasites. The early season parasite population was resident when PA immigrated, providing high levels of PA parasitism. Preservation of early season GPA as a host for aphid parasites in the management of PA is discussed.
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