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Thresholds for diamondback moth larvae are 100-150 larvae per square meter in immature to flowering plants and 200-300 larvae per square meter in plants with flowers and pods…
Canola Watch Posts
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In very dry conditions: If canola is $12 per bushel and spray costs $8 per acre, the threshold at the early pod stage is 5 lygus adults or late instar nymphs per 10 sweeps (0.5 per sweep). In moist and high-yield conditions: The economic threshold is quite a bit higher. At early pod stage, 50 lygus per 10 sweeps (5… -
Thresholds for lygus bugs and cabbage seedpod weevil are based on a specific sweep net technique. If you’re not doing a complete 180° pattern, walking while you sweep, and keeping…… -
As canola starts to move from flowering and into pod formation, growers will often notice blanks up the raceme where pods did not form. Heat and drought would be common reasons this year… -
While scouting for flower staging, canopy moisture and pod-feeding insects, also take a look for deformed buds and growing points, small pale flowers and anything else unusual. Over the years, Canola Watch has written about all kinds of potential causes for a wide range of symptoms at the reproductive stage. These include… -
With prolonged dry conditions and recent hot weather, yield potential has dropped to very low levels in some fields. One CCC agronomist this week had a conversation about cutting this canola for silage. For a helpful link and more important shorts…
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Hot and dry or hot and humid? Hot, dry weather should reduce the risk of heavy sclerotinia infection, even if moist weather earlier promoted a lot of apothecia emergence and spore release. Hot, humid weather that leads to morning dew and a humid canopy can promote the disease. Keep in mind that even thought the sclerotinia fungus does not like… -
While some areas are reporting higher numbers of diamondback moth larvae (shown above), it takes 100-150 larvae per square metre in immature to flowering plants or 200 to 300 larvae per square metre in plants with flowers and pods to cause enough damage to warrant a spray. Natural controls, including beneficial insects, tend to keep numbers below thresholds…
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This article provides a review of thresholds for major insect pests of canola, as well as background on how they were established and how following thresholds can improve profitability…