Abstract
Abstract ‘Russet Burbank’ potatoes were planted in open furrows on April 20, 1977, in Ritzville silt loam soil at Yakima, Washington. Plots were 2 rows wide, 1.72 m, and 15.2 m long. On the same day the granular insecticides were dribbled through a hand-operated, funnel-type applicator over the potato seed pieces, and the sprays of the emulsifiable concentrates were applied in 187 liters of spray/ha over the seed with a CO2 sprayer; then the seed pieces were covered with soil. The treatments were replicated 3 times in a randomized complete block design. The crop was sprinkler-irrigated: 38 cm of water was applied between May and September. Aphid counts were made from 20 compound potato leaves/plot in June and from 15 compound potato leaves/plot in July. The percent of plants damaged by the Colorado potato beetle was recorded on July 7, 18, and August 19. The data were subjected to analysis of variance with Duncan’sMultiple Range Test.
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