Abstract
Abstract Barley was planted 29 Apr near Kimberly, Idaho. The soil type was Portneuf silt loam and the field was surface irrigated. Two rates of Asana were applied with a CO2-pressurized backpack sprayer in 50 gal finished spray/acre. The Asana plots and an untreated control plot were replicated 4 times in a randomized complete block design. Individual plot size was 25 by 25 ft. Aphids were counted at 2, 6, and 13 DAT; 10 tillers/plot were randomly selected and examined, aphids/head and tillers were recorded. Aphids in the heads at the first posttreatment count were exclusively the English grain aphid. Aphids on the tillers were 90% rose grass aphid and about 3% each bird cherry-oat aphid and corn leaf aphid.
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