Home Crop Monitoring Wheat School: Wheat midge forecast map in the red

Wheat School: Wheat midge forecast map in the red


Yearly, Sask Wheat and different Prairie wheat teams, exit and pattern soil to search for wheat midge cocoons which have overwintered, after which create a forecast map from that data. The wheat midge forecast map is exhibiting plenty of red, which is a bit alarming.

Wheat midge is certainly on Tyler Wist’s radar. He’s a area crop entomologist at Agriculture and Agri-Meals Canada, Saskatoon, Sask., and he joins Kara Oosterhuis for this Wheat College episode.

Wheat midge populations are tied to climate, says Wist, and that earlier work by AAFC entomologists exhibits that wheat midge want about 25 mm of rain in the spring to get these overwintering cocoons to turn into adults. This coincides with spring wheat germination and emergence.

“The same rain that gets the spring wheat out of the ground, also gets the wheat midge out of the ground,” says Wist.

Wheat midge will actually turn into an issue when the boot begins to separate in wheat, round Zadoks stage 50 to 60, says Wist. “About halfway through anthesis, the wheat heads will become more resistant to the wheat midge and they really don’t do very well on them,” he says.

About the final week in June is when wheat midge comes out, at daybreak or nightfall. You’ll see grownup females come out to put eggs round 8:00 pm on a peaceful night with low wind and first rate humidity, he says.

Earlier than you spend your evenings anticipating tiny midges in flight, scout in the crop or use a pheromone entice or sticky entice (or pie plate with cooking oil sprayed on it). As soon as you identify you’ve gotten midge, the grade-loss threshold is one grownup per 10 heads. If there’s one wheat midge on 5 heads, that’s the financial threshold for yield loss.

It’s critically essential to behave rapidly in management of wheat midge. Adults (the damaging stage) solely reside about 5 days. A small parasitic wasp, referred to as Macroglenes penetrans will assault wheat midge eggs or instar larvae and can assist scale back the subsequent 12 months’s inhabitants of wheat midge by as much as as a lot as 30 per cent, says Wist. Nonetheless, the wasp emerges after the grownup midges — spraying too late is a double loss: the injury of the midge is completed, and also you’ll knock again the pure enemy.


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