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The development of a pheromone-based action threshold for management of swede midge (Contarinia nasturtii (Kieffer)) in canola (Brassica napus L.)

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Title: The development of a pheromone-based action threshold for management of swede midge (Contarinia nasturtii (Kieffer)) in canola (Brassica napus L.)
Author: Muzzatti, Matthew James
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Hallett, Rebecca H.
Abstract: A pheromone-based action threshold for swede midge, Contarinia nasturtii (Kieffer), in canola, Brassica napus L., was developed through a series of laboratory experiments and action threshold field plot trials. Evidence of compensation by canola in response to herbivory was discovered. Compensation occurred through increased production of 2° and 3° racemes and pods, and was maximized with exposure of 4.5 – 6.1 midge per plant. Field trial results indicate that using an action threshold to time insecticide applications can be economical and effective, and that Matador® 120EC alone was more effective than Coragen® in alternation with Matador® 120EC. The recommended pheromone-based action threshold protocol for swede midge in canola is now: an initial application of Coragen® after a cumulative trap capture of 20 midges across all traps, and then subsequent applications of Matador® 120EC whenever the threshold of ≥3 males/trap/day is reached, with a minimum 7-day interval between applications.
URI: http://hdl.handle.net/10214/15910
Date: 2019-04
Rights: Attribution-NoDerivatives 4.0 International


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Attribution-NoDerivatives 4.0 International Except where otherwise noted, this item's license is described as Attribution-NoDerivatives 4.0 International