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Cover: Root maggot (Delia sp.) (Diptera: Anthomyiidae) adult on canola (Brassica napus L.) See "The Effects of Soil Fertility and Other Agronomic Factors on Infestations of Root Maggots in Canola," by Dosdall et al., p. 1306-1313. Photo by Lloyd M. Dosdall.
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