J. ent. Soc. Ont. Volume 146, 2015
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Volume 146, 2015 I. FROM THE EDITOR [PDF] II. ARTICLE J.L. Smith, T.S. Baute, C.E. Mason. 2015. Pheromone races of Ostrinia nubilalis Hübner (Lepidoptera: Crambidae) infesting grain corn in Manitoba, Ontario, and Quebec provinces of Canada. J. ent. Soc. Ont. Volume 146: 41-49 [PDF] J. ent. Soc. Ont. Volume 146: 41-49 Abstract Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae), European corn borer, is an economic pest of Zea mays (Linnaeus) (Poaceae) and other vegetable crops that is distributed throughout the agricultural production regions of Ontario, Québec, and Manitoba in Canada. Two phenotypic races of O. nubilalis have been identified that differ in the proportion of isomers of 11-tetradecenyl acetate (11-14:OAc) in their sex pheromone. The Z-race (Z-11-14:OAc) is the predominant race in the United States of America, known to inhabit Zea mays as its primary host, whereas the E-race (E-11-14:OAc) infests a wider host range, including many vegetable crops, and is only found within the Eastern coastal states of the United States of America. Collections of O. nubilalis were made from grain corn in agricultural regions of Ontario, Québec, and Manitoba in 1997, 2008, 2009, and 2010, and females were analyzed for pheromone race using gas chromatography (GC). Only Z-race O. nubilalis were found in Ontario (from Essex to Leeds and Grenville Counties) and in Southern Manitoba. E-race individuals were detected in collections from Ottawa, Ontario and St. Anicet, Québec, with an increasing proportion of E-race phenotypes in samples from west to east. This is the first report of pheromone race determination using GC among Canadian O. nubilalis populations and the first documentation of E-race O. nubilalis in Canada using GC. |
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