Home / Canola Watch / Insects / Page 20
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Lygus is one insect you may find in canola this week, but spraying lygus before pod stages rarely provides an economic benefit. Lygus do most of their damage at the pod stages…
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By this stage of the season, flea beetle and cutworm risks are lower because crops are bigger and these two insects are in natural seasonal decline. Adult flea beetles have laid their eggs and are dying. Cutworms are pupating. We're now moving toward sweep net timing for lygus and cabbage seedpod weevil…
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Keys to the spray decision are scouting and timing. The economic threshold is 20 CSPW per 10 sweeps generally across the field. If weevils are at thresholds, the time to spray is at 10-20% bloom, just as first pods reach 3/4” long…
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General wilting is likely environmental, but patches or individual plants could have some other cause. Dig them up carefully and look at their roots for clubroot galls, root diseases and cabbage root maggots…
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Heat, drought, off-label herbicide applications, male sterility, insects, sulphur deficiency, boron deficiency…
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Cabbage seedpod weevils are attracted to the buds on early canola plants, as shown in this Brooke Moon photo. While they will feed on these buds and destroy some of them, spraying is rarely recommended before 10% bloom…
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Pea leaf weevils (bottom) can be found in canola but the only weevil of concern is the cabbage seedpod weevil (top). Thank you Shelley Barkley of AAF for the excellent photos…
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Usually by the end of June, most of the cutworms that overwintered as eggs or partly grown larvae (including redbacked, as shown in this John Gavloski photo) have pupated and are no longer a risk to crops. In early and warm springs, cutworms will often pupate earlier in June. In cooler spring, cutworm activity often carries into July before pupation…
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Higher than normal cutworm feeding has been reported in some locations. This could be due to various factors, including the long fall, early spring and weed growth to provide food through these times. Here are scouting techniques to follow while inspecting canola fields for cutworms…