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Canola petals can turn orange in response to stress, usually heat stress. There is nothing that can be done about heat damage. White or pale flowers can have many possible causes…
Canola Watch Posts
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An AAFC study has shown very clearly that with continuous canola, there is a statistically significant increase in crop damage by root maggots. No insecticides are available to control root maggot in canola, but providing a one year break seems to make a significant reduction in root maggot losses, the study found… -
Fields that have received lots of rain may be showing sulphur deficiency. Rain leaches sulphur lower in the soil profile. Plants can usually access this leached sulphur later in the season, but the roots have to reach that far. Often with heavy rain throughout the season, plants will not root as deep. In this case, a top dress up to… -
It’s mid July, and some very early canola is already being swathed in parts of Manitoba. Waiting until 60% seed colour change on the main stem will result in the highest yields because more seeds have a chance to fill completely…
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More aster leafhoppers are carrying phytoplasm this year, so that could mean a jump in aster yellows. Sclerotinia stem rot risk may still be there even if it hasn’t rained. When spraying in high temperatures (> 25 C), check product labels or consult retailers or fungicide companies about results in hot weather. Late flower and podding stages are when lygus…
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When it comes to the sclerotinia stem rot risk, moisture has a much larger influence than temperatures. Infection can be high in hot weather as long as the moisture is there. Moisture can come from rain, relative humidity in the high 80s, or morning dew… -
Heat — Foliar boron applied at flowering has been tested on canola in Ontario to as a way to prevent blossom blast during summer heat waves. Four years of grower field studies from 2008-11 found inconclusive results. Hail — Nutrient and fungicide top dress treatments have also been promoted to help heal and restart canola after hail. We don't have… -
Our current economic threshold tables for lygus in canola may be too low when applied to current canola production systems across the Prairies. If a canola stand is healthy and growing fast, growers are reportedly doubling or tripling thresholds. Say the threshold is 10 per 10 sweeps, some growers are doubling that to 20 per 10 sweeps as the action… -
Leafhoppers are more plentiful and carrying more aster yellows phytoplasm this year, but spraying is rarely effective. Bertha counts are starting to spike in some locations. Cutworms are still feeding in some locations, but the threat should be over for most regions…