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Title: APHID RESISTANCE

Author
item Porter, David

Submitted to: Oklahoma Agriculture Experiment Station Departmental Publication
Publication Type: Experiment Station
Publication Acceptance Date: 2/1/2003
Publication Date: 3/1/2003
Citation: Porter, D.R. 2003. Aphid resistance. In: Partners in Progress. Wheat Research at OSU 2003. Oklahoma Agriculture Experiment Station Report. P-999:12.

Interpretive Summary: Summary report; no interpretive summary required.

Technical Abstract: Excellent sources of resistance to Russian wheat aphid and to greenbug made their way through the advanced testing phases of the OSU breeding program this year. Some lines were cycled back to undergo further purification, while others require additional testing for quality. These lines are expected to surface as candidate varieties within the next two years. OK95616-99-6756 (a greenbug-resistant line) went through the first stage of breeder seed increase in preparation for release. This line, which offers a broader range of adaptation than currently available resistant varieties, will be used in the USDA-ARS Areawide Pest Management Program for Russian Wheat Aphid and Greenbug. This resistance wheat will be grown in a diversified cropping system on demonstration farm sites to demonstrate the value of using an integrated pest management approach to wheat production in Oklahoma. For more information in the program, please check the Internet website http: www.pswcrl.ars.usda.gov/awpm.htm. We are now using a new techniques that lets us look at what seedling roots while bird cherry-oat aphids are feeding on the leaves. Using this technique, we can visualize the damage the aphid causes through reduced root growth rates. By comparing root growth among different wheat lines during aphid feeding, we can now identify lines with resistance to the bird cherry-oat aphid. Preliminary results are encouraging. More work needs to be done on lines from the wheat collections to identify the very best resistant lines before we can start including this trait in the breeding program. We are committed to providing wheat cultivars with resistance to Russian wheat aphid, greenbug, and bird cherry-oat aphid to Oklahoma producers. The process of finding new sources of resistance and transferring that resistance into high performance Oklahoma wheat is ongoing.