Connelly, June

Halbert, Susan E.

Johnston, Richard L.

Pike, Keith S.

Undetermined

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Section 1. Mites and Sap-Sucking InsectsCategory. Biology, Thresholds, Monitoring and SamplingSURVEYING FOR biuraphi* noxia AND OTHER CEREAL APHIDSSusan Halbert, Keith Pike, June Connelly and Rich JohnstonSW Idaho R/E Center, Rt #2, Box 2126, Parma, ID 83660The Russian wheat aphid was first found in the suction trap atParma in late June. Since then, they have been collected in traps atParma, Caldwell, Mountain Home, Kimberly and Holbrook. Infestationshave been confirmed in the following counties: Canyon, Payette, Gem,Washington, Power, Oneida, Bonneville and Bingham.Most fields of volunteer grain in Canyon County were 0(undetectable) to 2% infested in surveys conducted between 20-27August. Those that had higher levels of infestation were near a knownsource. In a subsequent survey on 17 September, fields averaged 5% ofplants infested.Some Russian wheat aphid infestations in winter wheat haveincreased dramatically during the fall season this year. Two of thefields surveyed in the Treasure Valley were 8-9% infested the firstweek of November and 60-64% infested on the 19th of November. Russianwheat aphids in a field near Caldwell were observed to be active andreproducing on 17 December.Early planted fields and fields near heavily infested volunteergrain had a higher percentage of plants with Russian wheat aphids thanlate planted or isolated fields. The heaviest infestations were foundeast of Idaho Falls, where fall grain was planted next to winter wheatseeded in the spring for erosion control. The cover crop neververnalized and thus became prime habitat for Russian wheat aphidsduring the later summer dry season. As the plants declined in thefall, the aphids moved into the newly emerged wheat. The problem wasnot detected until 60-80% of the plants were infested.Numbers of grain aphids collected in suction traps were lower thisyear than in the past years, especially in eastern Idaho. Grain aphidscomprised approximately 38% of the total collection this year asopposed to 70% and 64% in 1985 and 1986 respectively. In all threeyears, the 5 grain aphid species collected most frequently includedSchizaphU araminum, Rhopato&iphum padi, Wetopoiophium dirhodum,Rhopaio&iphum maidU and Sitobion auenae.

Surveying for Diuraphis noxia and Other Cereal Aphids

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Surveying for Diuraphis noxia and Other Cereal Aphids

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