Abstract
Abstract Aspects of adult host plant preference and preimaginal development of the cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham), were investigated in spring canola, Brassica napus L., in the Mixed Grassland Ecoregion of western Canada. In spring, overwintered adults initially occurred in high densities on volunteer canola and other brassicaceous weeds. In a mixed stand of Sinapis arvensis L., Thlaspi arvense L., and Descurainia sophia (L.) Webb, weevil numbers were significantly higher on S. arvensis than the other host plant species. Regardless of host plant species, adults were found more abundantly on inflorescences than on leaves or stems. Little adult migration to spring canola occurred when crops were in the seedling and rosette stages, but migration increased significantly to a maximum in the bud and flowering stages. Most oviposition occurred when plants were still flowering but pods on lower racemes were elongating. First instars were most abundant when seeds in lower pods were begi...
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