The swede midge, Contarinia nasturtii (Kieffer) (Diptera: Cecidomyiidae), causes galling, deformation and twisting of brassicaceous plants resulting in significant yield losses. Insecticide applications cannot be effectively timed on the basis of damage symptoms and is complicated by the short adult lifespan and protected nature of larval feeding. Proper timing of pest management practices could be achieved if emergence of adult swede midge could be accurately assessed or predicted. A model for predicting adult emergence, based on degree-day accumulations and soil moisture parameters, is being developed for use under Ontario conditions. Results from one season of study will be presented.
Species 1: Diptera Cecidomyiidae Contarinia nasturtii
Keywords: phenology model
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