Cereal Aphid Control, 1987

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.