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Wednesday, August 15, 2018

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2664. Holbert, S., L.E. Sandvol, B. Stoltz, and R. Johnston. 1988. Russian wheat aphid.. ID Agr. Expt. Sta. CIS #817.
First found in Idaho in early 1987; spread throughout state that season; infests wheat, barley, triticale, other grasses; volunteer grain an important host; aphid secretes a toxin that causes leaf rolling and plant streaking (purple in cool weather, white in hot weather); control threshold when > 10% of tillers are infested in spring; insecticide control listed.

3180. Simmonds, B. and D. Brosten. 1991 Oct.. Biocontrol blitz targets Russian wheat aphid.. Agrichemical Age 34(9):8-10, 35.
The article describes current efforts to develop biocontrols for the Russian wheat aphid. Parasites and predators are being released and tested in a number of areas, including WA and ID. Wheat varieties are being screened for resistance to the pest. No one expects biocontrols to eliminate the need for occassional insecticide treatments, but hope they will reduce the frequency of chemical control by keeping the aphids below the economic threshold. A national IPM program has been established for RWA control.

6766. Tanigoshi, L.. 1990. untitled. unpublished list, Dept. of Entomology, Washington State Univ., Pullman, WA.
The table lists the natural enemies of the Russian wheat aphid (RWA) Diuraphis noxia, the country of origin, and the release date in WA state. Over ten natural enemies have been released to date.

8343. Wysocki, Don. 1990. Developing resistance to Russian wheat aphid.. STEEP Extension Conservation Farming Update, Spring 1990, p. 7-8.
Work is underway at Pendleton, OR to find resistant wheat varieties for the Russian wheat aphid. South African researchers have found resistance to be conferred by single, dominant genes in some lines. Of 995 lines evaluated at Pendleton, only 20 had some tolerance to the pest.

10682. Simmonds, B. and D. Brosten. 1990. Biocontrol blitz targets Russian wheat aphid.. Agrichemical Age, Oct. 1990, p. 8-10..
Washington State University entomologists have been releasing parasitic wasps since 1988 to help control Russian wheat aphid. USDA_APHIS has released six wasp species, one fly species, and six lady beetle species. The national biocontrol effort against the aphid is part of a broader $2.1 million National RWA IPM program. RWA has infested fields in sixteen western states, and has probably spread near its maximum range. One helpful cultural practice is to eliminate any green host plants in late summer or winter to starve the aphids. Also, planting spring wheat or barley as early as possible can reduce infestations.

10950. Harwood, R.F.. 1989. Countermeasures against Russian wheat aphid in Washington.. EM4835, Cooperative Extension, Washington State Univ., Pullman..
Seven major thrusts for IPM control of RWA are briefly described as part of a national effort. Researchers in Washington are concentrating on aphid population dynamics, natural enemies, insecticides, aphid-resistant cereals, and information dissemination.

10960. Anon.. 1989. Russian wheat aphid control for the Pacific Northwest, spring 1989.. unpublished, Dept. of Entomology, WSU, Pullman, WA.
Scouting procedures for RWA are described. A spray decision table is included to determine if an infestation has reached the economic injury threshold.

10969. Pike, K.S. and D. Suomi. 1988. Russian wheat aphid.. EB1486, Cooperative Extension, Washington State Univ., Pullman.
This bulletin briefly describes Russian wheat aphid distribution, description, biology, host plants, injury, and control.

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