WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Thursday, October 18, 2018

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Search results on 10/18/18

1140. Burton, R.L. and E.G. Krenxer. 1985. Reduction of greenbug (Homoptera: Aphididae) populations by surface residues.. J. Econ. Entomol. 78:390-394.
Greenbugs were significantly less numerous under high residue conditions in winter wheeat (V-blade and no-till) versus moldboard plow or disc. Trials in Oklahoma. Related to residue level, not some other effect of tillage. T: tillage X population X date.

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.

2702. Homan, H., L.E. O'Keefe, and R.L. Stoltz. 1984. Aphids on peas and lentils and their control.. ID Agr. Expt. Sta. CIS #748.
Describes life history of pea aphid and cowpea aphid; natural enemies; virus diseases they spread; early planting an advantage; check threshold levels; insecticide controls 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.

5235. Pike, K. and D. Allison. 1990. Control of small grain aphids on winter wheat.. unpublished research results, WSU IAREC, Rt. 2, Box 2953-A,.
Describes 1989 research results of screening 12-15 insecticides on both hard red and soft white winter wheat at the Irrigated Research Center in Prosser. All insecticides reduced aphid numbers compared with the check. Three aphids were monitored - Russian wheat aphid, bird cherry-oat aphid, and English grain aphid.

6508. Smith, R.H.. 1918. A preliminary report on the clover aphis and methods for its control.. ID Agr. Expt. Sta. Bull. #112.
Very destructive in southern Idaho on red and alsike clover fields for seed; almost total loss; first problems in 1907; natural controls exist - weather, predators, grazing management; using "Black leaf 40" spray.

6747. Stoltz, R.L.. 1980. Some common aphids infesting Idaho field crops.. ID Agr. Expt. Sta. CIS #543.
Lists various aphids and the crops they attack; alternate hosts, overwintering, and economic threshold; color pictures of the aphids.

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.

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