Hail

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  • Hail bruising and pod shatter

    These white spots on pods and stems are hail damage. These plants and seeds should be fine, but more intense hail could have damaged and bruised seed.

    Hail can cause seeds inside pods to bruise. This bruising can also cause pods to shatter prematurely, although the shatter tendency depends on the extent of hail. If only a few bruises, shatter loss should be minimal. However, if bruising occurs on more than 25-30% of the pod, and the spots turn white or brown, shattering is likely to occur. When those pods will shatter is difficult to predict.

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  • Top dress after hail?

    Hail damage.

    We had a “follow up question” to last week’s article “Hail damage: Economic loss depends on cro stage.” The grower was asking about foliar nutrition after a hail storm. He had 2” of rain a week after a hailstorm and he feels that a foliar application could be worthwhile. The hail hit canola at the 5-6 leaf stage with a lot of main stem breakage. The grower asked for any other information on hailed canola and what he can do to help it recover.

    We reached out to a few crop nutrition experts, and here are the answers we got:

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  • Rescue treatments for hailed crop

    Nutrient and fungicide top dress treatments have been promoted to help heal and restart canola after hail. We don’t have published studies on using these or any treatments for this purpose in Western Canada, so it’s buyer beware. Leave a check strip to see if they improved yield. For products that require foliar uptake to work properly, severe hail damage may have striped the leaves, reducing the surface area available for absorption by the plant.

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  • Rescue treatments for heat, hail

    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 published studies on using these treatments for this purpose in Western Canada, so it’s buyer beware.

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  • Bud damage may have many causes

    Insects, heat stress, hail and sulphur deficiency can all cause bud discoloration and damage. Scouting closely for insects may be required to find out which might be the cause, especially if heat stress and hail can be ruled out.

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  • Rescue treatments unproven for hail remedy

    Before trying any treatment on hail damaged fields, give the crop time to recover. It may recover nicely on its own, likely with later maturity but with a large percentage of its yield potential intact. Or, if the growing points or most of the leaves are stripped off, the plants may not recover sufficiently to warrant further investment in the crop.

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  • Hail reported, some severe

    Canola hit with light to moderate hail at up to 20% flower may recover with only minimal to moderate yield loss. Plants will flower longer and compensate. More severe damage warrants a call to the insurance adjuster.

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  • Canola can recover from hail up to 20% flower

    Hail that hits canola before flowering or at early flowering may have a minimal effect on yield. Plants will flower longer and compensate.

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  • When to swath hailed crops

    A number of hail storms in Alberta earlier in the season have resulted in regrowth at the top of the plant. This regrowth is now considerably late and it is questionable whether that portion of the plant can contribute to yield before frost. Growers with such crops are encouraged to concentrate on the growth and […]

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