Management of Lygus Bugs and Seedpod Weevil In Canola At The Farm Level

Researcher: Hector Carcamo, Agriculture and Agri-Food Canada, Lethbridge; Scott Meers, CDC South, Alberta Agriculture, Brooks; Lloyd Dosdall, University of Alberta; Owen Olfert; AAFC Saskatoon

Project Code: CARP 2010-20

Final Report: March 2014

Summary: Cabbage seedpod weevil (csw) has become a chronic problem for canola growers in areas south of highway 1 in Alberta and SW Saskatchewan. Lygus bugs, like the csw arrive to canola fields at bud and early flower, but they peak later at the early or mature pod stage. Researchers with AAFC led a four-year farm-scale study to determine the impact of spraying insecticide for csw at early flower on abundance of lygus bugs at early pod stage in commercial farms, canola yield and the impact of weather-related factors. Research results show that spraying insecticide at the early flower stage for csw reduced the abundance of lygus bugs at the pod stage in most cases. But the results also show that if numbers of csw have not reached threshold levels at early flower, there is no yield benefit from spraying for potential other future pests.

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