Abstract
Abstract Winter wheat 'Arapahoe' was planted (10 Sep) in a Lismore silty clay loam soil in 17.5 cm rows using a ten-row International drill near the Northern Grain Insects Research Laboratory, Brookings, S. Dak. The experiment was setup using a complete randomized design with 4 replications of each treatment. One m2 screen cages were placed over wheat which was then artificially infested (25 Sep) with laboratory reared Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko). Pretreatment counts indicated 19.2 RWA/tiller (individual leaf blade) were present. Rescue applications (16 Oct) were applied using a hand held spray boom with 6 nozzles (Teejet 8002), 12 inch spacing, 25 psi and 20 gal/acre delivery rate. The 7 DAT RWA count was made by randomly selecting 4 tillers from each quadrant within the meter square cage. Additionally, a 21 DAT count (6 Nov) of RAW/16 tillers was made in the same manner from each cage to determine residual control or RWA resurgence.
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