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Title: Plant responses to seven Russian wheat aphid (Hemiptera: Aphididae) biotypes found in the United States

Author
item RANDOLPH, TERRI - COLORADO STATE UNIV
item PEAIRS, FRANK - COLORADO STATE UNIV
item WEILAND, AUBREY - SYNGENTA RES STN, CO
item RUDOLPH, JEFFERY - COLORADO STATE UNIV
item PUTERKA, GARY

Submitted to: Journal of Economic Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/9/2009
Publication Date: 10/1/2009
Citation: Randolph, T.L., Peairs, F., Weiland, A., Rudolph, J.B., Puterka, G.J. 2009. Plant responses to seven Russian wheat aphid (Hemiptera: Aphididae) biotypes found in the United States. Journal of Economic Entomology. 102(5):1954-1959.

Interpretive Summary: There are currently seven biotypes of the Russian wheat aphid (RWA) have been described based on how virulent they are to resistant cereals. Since that time more sources of resistance to RWA have been discovered. There has also been a question as to the repeatability of resistance studies from different locations in the USA. This paper reports a joint study between Colorado State University and the USDA-ARS, Stillwater, Oklahoma, the investigated the virulence of seven RWA biotypes on 24 plant entries. At Colorado, Biotype 1 was the least virulent of the biotypes across plant entries while biotypes 4, 5, 6, and 7 had intermediate virulence. Subtle differences within a few plant lines separate Biotypes 4, 5, 6 and 7. Biotype 3 was a highly virulent aphid, with high virulence to ten plant entries and intermediate responses in five entries. However, Biotype 2 was the most virulent strain tested with susceptible responses to twelve entries and intermediate responses to five entries. At Oklahoma, virulence profiles for the seven biotypes were similar to those found in Colorado but overall, tended to show higher virulence. These studies demonstrated that both study locations demonstrated that Biotypes 1-7 are uniquely different, thereby supporting previous biotype studies and a high degree of repeatability between locations.

Technical Abstract: The virulence to resistant cereals and the classification of recently described Russian wheat aphid Biotypes 1-7 were investigated by utilizing 24 cereal differentials at two research facilities, Colorado State University and the USDA-ARS Plant Science Research Laboratory in Stillwater, OK. Differences in virulence among the seven biotypes were observed between Colorado and Oklahoma. At Colorado, Biotype 1 was the least virulent of the biotypes tested, with susceptible ratings observed in five plant entries and intermediate ratings observed in four entries. Biotypes 4, 5, 6, and 7 had intermediate virulence. Biotypes 4, 5, and 7 share similar responses, with susceptible responses in six entries and intermediate responses in five entries. Subtle differences within a few differential lines separate Biotypes 4, 5 and 7. Biotype 6 has susceptible responses with only four plant entries, but ten entries had intermediate responses. Biotype 3 was a highly virulent strain, with susceptible responses in ten entries and intermediate responses in five entries. Biotype 2 was the most virulent strain tested with susceptible responses to twelve entries and intermediate responses to five entries. At Oklahoma, virulence profiles for the seven biotypes were similar to those found in Colorado but overall, tended to show higher virulence. These studies demonstrated that both study locations demonstrated that Biotypes 1-7 are uniquely different, thereby supporting previous biotype studies and a high degree of repeatability between locations.