2010 – Issue 11

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  • Sclerotina control at 20% bloom

    Issues of the week: July 7, 2010 — Spraying to prevent sclerotinia stem rot has begun, and flowering fields will move quickly through the spray window. Fields at 20% flower that have had moisture the past 10 days, have precipitation in the forecast, and have  good yield potential and lush canopies are good candidates for […]


  • Crop and weather update:

    Peace (B.C. and Alberta): High Prairie and north had an inch or more of rain in the past week and canola looks good. The rest of the Peace was hit and miss (mostly miss) for moisture. Canola can still recover in these regions if rains come soon, but many other crops have irreversible drought damage. […]


  • Quick Hitters

    Top dressing nitrogen after 30% flowering provides very little if any economic benefit. But sulphur topdress may provide a benefit at this stage for deficient crops. Click here for more on identifying sulphur deficiency. Consider the economic payoff before trying products that claim to rescue a crop that’s thin, flooded and oxygen depleted. For many of […]


  • Sclerotinia management: 3 key points

    The decision to spray petals to prevent sclerotinia stem rot depends on 3 key questions: 1) Have conditions been moist over the past few weeks for apothecia development and survival? 2) Is the canopy thick and is yield potential high? 3) Does the forecast call for more rain and/or humidity in the next week? If […]


  • Sclerotinia management: What is 20% flower?

    Fungicide to protect the crop from sclerotinia stem rot infection must be applied to petals before infected petals start to drop into the canopy. Petal drop starts after 30% flower, so the best time to apply is at or just prior to 30% flowering to cover as many flowers as possible. This is assuming conditions […]


  • Consider split application for multi-stage crop

    If crop staging is widely variable and if fungicide is needed to prevent sclerotinia stem rot, a split application may be worthwhile. The first application can be made when the first plants reach recommended staging. If necessary, a second application can be made when the remaining plants are ready to be sprayed. Refer to current […]


  • Tips to control multiple insect species at once

    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 […]


  • Keep malathion out of canola bins

    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 […]


  • Coming events

    The Crop Diagnostic School in Carman, Manitoba will run July 6 to 9 and July 12 to 16. Lessons involving canola will cover pest management topics, including seedling diseases, sclerotinia, blackleg, insects and more. Click here for more information and to register. Canola Crop Walks in Alberta July 9 — Westlock, Barrhead. CCC senior agronomy specialist John […]


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