Home Crop Monitoring Assessing frost damage and a pre-emergent herbicide application in cereals

Assessing frost damage and a pre-emergent herbicide application in cereals


A lot of the Prairies has skilled freezing temperatures over the previous few days, with a threat of frost not but out of the forecast. This has growers involved about cereal tolerance to frost, in addition to when and if a pre-emergent application can nonetheless occur.

In comparison with canola, wheat and barley are usually extra resilient to chilly temperatures than canola can be, says Jeremy Boychyn agronomy specialist with Alberta Wheat and Barley Commissions. At this stage in wheat and barley on the Prairies, the rising level, or most of it, remains to be beneath the soil degree.

“We may see some leaf burn, but typically we’re not going to see whole plant death, and that’s because there’s the soil and some of that moisture in the soil kind of buffering that cold temperature,” says Boychyn.

Issues to look out for embody some leaf-tips dying, however three to 5 days after the frost occasion, new progress could seem. For wheat, the -8 to -10 °C vary is the purpose at which leaves burn. For barley, the vary is between -4 to -6 °C. It doesn’t imply the plant is useless, says Boychyn, it simply means a few of the leaf has died off.

Catch the complete dialog for extra on frost, pre-emergent herbicides, and preserving information of plant stands. Story continues beneath participant.

Boychyn additionally says that with wheat or barley genetics, a little bit of stress will up-regulate the gene stress hormones, which primes the plant for extra stress later.

Once you’re going out and assessing the crop, hold in consideration there are such a lot of variables that play into frost severity, like soil moisture, residue cowl, how chilly it obtained and for a way lengthy. Boychyn says to search for leaf-tip burn, and then in case you see this symptom, dig up the plant and decide if the crown is mushy or water-soaked and has died off. Sometimes a wholesome plant will likely be white and clear wanting between the roots and the leaves.

Spraying choices are additionally impacted by this chilly snap, whether or not it’s pre-emergent functions or in-crop, relying on the realm.

“Typically the answer is we want to be waiting until those plants have the ability to grow again,” says Boychyn. Metabolism must perform, each on the weeds and the crop facet as a result of herbicide wants metabolism to be shuttled by way of a weed’s system, and the crop must be energetic in order to metabolize the herbicide.

Night time-time temperatures must be no less than 5 °C and a heat sunny day in order to get metabolism going once more. New leaf progress can be essential for correct metabolism and efficient herbicide functions.

Boychyn recommends having an agronomist come out and assess the scenario earlier than making a pre-emergent herbicide application. It will possibly make for a tight window between the time of these optimum temperatures come again after a frost occasion, and when the crop comes up.

“We know that weeds that have emerged prior to the crop emerging have the most impact on yield,” says Boychyn. “So we know we want to control those as much as possible, given the opportunity, rather than wait til after.”


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