• Much of southern and central Alberta and parts of western Saskatchewan still have high levels of lygus bug feeding. Lygus bug numbers are up to 10 times economic control thresholds in fields from Crossfield to Penhold, Alberta. Economic thresholds at pod ripening are 8-20 adults or late instar bugs per 10 sweeps when canola prices……
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  • First signs of diamondback moth larvae are larvae hanging from threads and feeding on leaves. Feeding damage is usually a mining of the leaf, giving the appearance of a “window pane.”  If the larvae are in the canopy, they will often move up to pods as leaves start drying off. Larvae feed on the surface……
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  • Issues of the week: July 14, 2010 — Unexplained bud browning and strange plant growth has retailers and growers in the Peace unsure of the problem. Drought stress, nutrient deficiency and herbicide damage are possible causes. In central Manitoba, root rot is the likely but unconfirmed cause of hairless and weak canola roots. The key……
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  • If a field has cabbage seedpod weevil and diamondback moth feeding, should economic spray thresholds be reduced to account for the combined pressure? In the case of these two species, the answer is no. Count them separately and stick to the economic control thresholds for each. Why? Because weevils attack flowers and buds, but diamondback……
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  • As bins are prepared for the coming harvest, keep in mind that using malathion on canola seed or in canola storage bins will result in detectable levels of malathion residue because malathion has a strong attraction to the oil in canola seed. Consequently, malathion can move into canola seed from storage bin walls. Detection of……
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  • Issues of the week: June 30, 2010 — Lygus spraying starts in the Peace, cabbage seedpod weevil spraying starts in the southwestern Prairie, and we’re all on diamondback moth alert. Scout damage closely and spray only when necessary. With so many potential insect threats, multiple sprays are probably not economical. Oh, and don’t forget about……
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