Four questions on insect observations in canola fields this week in Western Canada.
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Insect update: Lygus, bertha, CSPW
Lygus hotspots: Lygus numbers are high in some regions, with reports of 70+ per 10 sweeps in some fields in central and northern Alberta. Some fields will warrant a spray, but seeing the plane next door does not mean all canola in the area should get sprayed. Assess each field. More on lygus thresholds. Bertha…
Late-season insects and pre-harvest intervals
We had reports this week of bertha armyworm at higher numbers (maybe not at thresholds) in some very localized areas, lygus (it’s getting late), flea beetles (don’t spray them, it won’t help for next spring) and aphids (probably don’t spray them either). While doing a pre-harvest scouting for disease, take a look at the insect…
Insect update: Big berthas, weevil larvae, lygus
Bertha armyworms keep eating to within a few days of pupating. These 1.5” late-stage berthas eat much more than at smaller stages, doing a lot of damage in a week if numbers are at thresholds. Swathing does not end the threat. The bertha armyworm feeding cycle tends to end before swathing starts, but not always.…