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Scientific research in Western Canada shows lower yields for canola in short rotations. Blackleg (shown above), clubroot and many other factors can cause this yield loss…
Insects
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Numbers for August-emerging flea beetles have to be very high — perhaps 100 per plant — before economic losses occur. Some patches might be that high… -
Some farms are seeing more lygus than usual, but most counts are still below thresholds. James Tansey, entomologist for the Saskatchewan Ministry of Agriculture, says higher levels of lygus have been reported in mature canola near Moose Jaw, but the field is “likely too far along to be damaged”… -
Adult trap counts show a few potential hot spots for larvae feeding, but numbers can be quite different field to field. Check each field!…
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Scout lygus at late flowering and podding stages using a standard insect sweep net of 38 cm (15") diameter. The standard threshold is 20-30 per 10 sweeps…
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Even if an area is low risk according to provincial risk maps, local hot spots can flare up – which is why each farm should make its own assessment on a field by field basis… -
Diamondback moth larvae are generally low across the Prairies so far, but one hot spot has been noted in Rural Municipality 10 in Saskatchewan. This R.M. is south of Regina, near the U.S. border. Some populations of diamondback moth above the economic threshold have also been found in Eastern Manitoba recently… -
While out scouting for insects feeding on pods, you might also find these insects at work. Each of the insects in the quiz will feed on pest insects of canola, which is why we call them "beneficials". You might also call them Field Heroes…
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Check pods for feeding from bertha armyworm, diamondback moth larvae, lygus and other pests. If any pod feeders are found, make accurate counts in at least three locations 50 metres apart in each field. Then make spray decisions based on thresholds…
