SPATIAL SEGREGATION BETWEEN APHIS VERNONIAE (APHIDIDAE) AND PUBLILIA RETICULATA (MEMBRACIDAE), TWO SPECIES OF COLONIAL HOMOPTERA ON NEW YORK IRONWEED

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Abstract
Spatial segregation between the colonial homopterans Aphis vernoniae Thomas and Publilia reticulata Van Duzee on New York ironweed, Vernonia noveboracensis L., does not occur either among plant patches or among plants. Before August, spatial separation occurs on the plants, with A. vernoniae concentrated in the inflorescences and P. reticulata concentrated on the middle leaves. Apparent overlap increases as A. vernoniae moves onto senescing leaves late in the season. However, the A. vernoniae colonies are found nearer to the petiole, and there is little actual overlap in the distributions of the two species.