Abstract
Abstract Tomatoes were transplanted on 9 Aug at the Eastern Shore Agricultural Research and Extension Center, Painter, VA. Each plot consisted of a single row 20 ft X 5 ft, bordered on each side by an untreated guard row. On 1 Oct, heavy potato aphid populations developed in the test field. A pre-count of live aphids on 5 randomly picked compound leaves/plot was taken on this date and followed by a single application of all treatments. Treatments were applied with a backpack sprayer equipped with a 3 hollow cone nozzle boom and delivering 46 gal water/acre at 40 psi. To evaluate efficacy, the plots were sampled as previously described for the pre-count on the dates indicated in the table.
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