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Insects to watch for before and during seeding and immediately after emergence are cutworms, flea beetles, leafhoppers and diamondback moth…
Insects
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Scientific research in Western Canada has identified three factors that increase the risk of canola yield loss in short rotations. They are blackleg, clubroot and cabbage root maggot. Clubroot will drive the need for longer breaks between canola crops on more and more farms… -
A pesticide rinsate biobed can prevent the environmental contamination of surface and groundwater by pesticides. Instead of being disposed of directly on land, at the edge of a field or elsewhere, the rinsate from the sprayer can be applied to the biobed (so it is contained)… -
Think how on the ball we could be with insect management if everyone shared their scouting results? We could see hot spots flare up early in very localized areas, providing a highly valuable alert to farmers within and beside those areas. Provincial entomologists tracking insect outbreaks would welcome your input… -
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……
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How are your worm ID skills? Take the quiz and try to identify the four worms – two familiar, two not so much…
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Scout lygus at late flowering and podding stages using a standard insect net of 38 cm (15") diameter. Take ten 180° sweeps, and aim to sweep the flowers and pods while moving forward. Count the number of lygus in the net… -
Flea beetles feeding on canola leaves and pods are unlikely to cause an economic loss. Numbers have to be very high – perhaps 100 per plant – before economic losses occur…
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The three most common pod munchers are bertha armyworm, diamondback moth larvae and lygus bugs. Hot spots can sometimes be isolated to specific fields, so check each field. Before spraying, make sure insects counts are at or above economic thresholds. Applications made when insect numbers are below thresholds will not provide a positive return on investment and can do unnecessary…
