Extraction from Foliage and Within-Plant Distribution for Sampling of Brachycolus asparagi (Homoptera: Aphididae) on Asparagus1

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Abstract
Methods for extracting Brachycolus asparagi Mordvilko from asparagus, Asparagus officinalis L., foliage and the distribution of the aphid on the plant were studied to increase sampling efficiency. Aphids were efficiently extracted by methyl isobutyl ketone and Berlese-Tullgren funnels, but not by beating. Aphids had a clumped distribution and numbers decreased with increasing height on the plant. Sampling efficiency was optimized by sampling the lower secondary branches on the plant. The advantage of using Taylor’s power law over the mean crowding index to determine the optimum number of samples is discussed.

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