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Begin sweep netting for cabbage seedpod weevil when canola enters the flowering period. Select 10 locations within each field and at each location, count the number of weevils from ten 180° sweeps. At current prices, the threshold will be around 20-30 per 10 sweeps (2-3 per sweep). Anything below that and the canola plant will generally compensate for seedpod weevil…
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Leaf rollers probably aren't worth controlling. Wireworms will live up to 4 years as a larvae and will feed on canola. Bertha monitoring begins. Flea beetles numbers are falling for the season…
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Earliest canola is starting to flower this week, which means the sclerotinia spray decision looms. Spray timing, if a grower decides to go for it, should be within the window from 20% to 50% bloom. Canola can reach 20% flower in 4-5 days after first flower. The article also includes information on adding boron to a fungicide tank mix…
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Wind and rain have delayed weed control. We have articles this week on how to reduce spray drift when spraying in a little wind, and how to clean the tank properly between fields. Other topics include nitrogen and sulphur losses from excess rain, cutworms, diamondback moth larvae, blackleg and weed control windows…
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Canola can be damaged by trace herbicide residues left in a sprayer tank. This article underlines the importance of a complete clean out between products, and an understanding of what risks each product and each tank mix presents in terms of scrubbing effect and what may happen to a product or products if left in the tank for an extended…
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To reduce drift, use coarse sprays and apply at lower pressure, spray with at least some wind (calm is bad), slow down, consider shrouds, and keep the boom low…
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Rain has set back weed spraying. Early canola crops are near the end of their spray windows, even though some fields have not received a first pass and some fields got a first pass but need a second. Label application windows: Glyphosate: Anytime up to and including the 6-leaf stage of canola. Liberty: Cotyledon stage up to the early bolting…
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Heavy rains can increase nitrogen and sulphur leaching in lighter soils, and increase denitrification in heavier soils. While very good soil moisture conditions may increase canola yield potential, those rains may have depleted the nitrogen reserves somewhat. Top dressing is an option. Read more for topdressing tips…
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Cutworms can leave canola fields with bare patches, clipped plants and large chunks out of stems and leaves. Flocks of birds — crows, gulls, etc. — can be a sign that cutworms are present in large numbers, but nothing beats digging to confirm your suspicions. Cutworm thresholds are based on stand reduction, not actual cutworm counts. The threshold for canola…
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