Cabbage seedpod weevil numbers in 2021 were lower than normal for the fourth year in a row, but canola growers in southern and south-central Alberta should still be on guard.
A survey of 225 fields last summer (when canola was at 20 to 25 per cent flower) found that even in the south, numbers were often not at threshold levels for spraying (although some counts were about 90 weevils per 25 sweeps).
Nevertheless, the survey report says “the numbers of weevils found through this survey in southern Alberta and the southern counties of central Alberta indicate a potential of economically damaging populations in the next growing season.
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Any producers who grow canola (in those areas) will have to check their canola crops as they come into flower.”
