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Sunflower Staging and Guessing Maturity

SF G&D chart Prepared by Anastasia Kubinec, MAFRD Oilseed Crop Specialist Sunflower planting was spread out in 2014, which means flowering and dry-down will be as well. The chart below gives and...

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The Dreaded “F” Word – FROST

The forecasted temperatures for the week of September 8th look chilly, and with the forecast comes talk of FROST. Given its sporadic nature, long-range forecasting of frost is nearly impossible....

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Early September Frost Impact on Sunflowers

Frost anytime before the sunflower crop reaches physiological maturity (R9) can cause damage. Once sunflowers reaches the R7 stage (ray petals have dropped, back of head starting to turn yellow),...

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Frost or Color Banding in Cereals

In Manitoba, cold temperatures during the day and freezing temperatures overnight have been one of the big stories the past week. Cereal crop types are more tolerant of freezing temperatures than other...

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Cereal Crops Recovering from Frost Injury

The May 30th frost impacted spring cereal crops across Manitoba. Fortunately, majority of spring wheat, oats and barley were at the tillering stages of development where the growing point is still...

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Spring Frost or Late Snow and Emerged Canola – Time to Re-Seed?

Temperature is the instigator for causing frost, but damage inflicted and need to re-seed canola is highly influenced on these other factors: Duration – Short but LIGHT frost = < 2 hours,  may not...

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Are Herbicides to Control Dandelions Still Effective After a Fall Frost?

Fall is a great time to work on controlling perennials such as Canada thistle and dandelions. As temperatures get cooler, the nutrients start moving down into the roots and if a herbicide can be taken...

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So we had a Frost on our Soybean, Now what?

The first step in accessing frost damage is asking how cold it was last night. A light frost of -1°C for short durations may clip off a few off the top leaves with no effect on yield. The concern...

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Should I Still Desiccate My Sunflowers or Has the Frost Done it For Me?

  A killing frost in sunflowers is considered to be –4C to –5C for 6 or more hours. Although we have had a frost, we have not experienced a killing frost yet in Manitoba.  So, the current cold nights...

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