Wireworm (Coleoptera: Elateridae) survey in wheat-growing areas of northcentral and northeastern Oregon

H. H. Toba, J. D. Campbell

Abstract


A wireworm survey was conducted at 34 sites in wheat-growing areas of northcentral and northeastern Oregon using a baiting technique. The highest mean number of wireworms found at any site was 4.4 per bait of corn-wheat mixture. When wireworm numbers at each site were used to estimate the population density, some sites had densities high enough to cause yield reduction in spring wheat but not winter wheat. The species were predominantly Ctenicera pruinina (Horn), Limonius californicus (Mannerheim), and Melanotus longulus oregonensis (LeConte), with lesser numbers of Limonius infuscatus Motschulsky, Ctenicera glauca (Germar), Aeolus mellillus (Say), and Dalopius sp. False wireworms (Tenebrionidae) were also found at 10 sites, but their influence is uncertain.


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