Home Crop Monitoring Wheat School: Toppled stems indicate wheat stem sawfly

Wheat School: Toppled stems indicate wheat stem sawfly


Wheat stem sawfly is regarded as native to components of the southern Prairie provinces, and forecasting maps present that the pest is definitely current this 12 months.

“This is the time of the year where we’re starting to see some of those wheat stems topple over from wheat stem sawfly,” says Jeremy Boychyn, agronomy analysis extension specialist at Alberta Wheat and Barley Commissions. “Wheat stem sawfly is a pest that comes in on wheat, and we’ve seen, based on forecasts, that it has a lot of presence in the southern part of the province.”

The pest chews into the wheat stem, tunnels down the stem of the plant, and on the finish of the season will reduce a small notch within the backside of the stem, as they exit, which causes the plant to topple over.

Sometimes, there’s greater stress from this pest insect round area edges, says Boychyn, however he recommends to exit and scout the entire area to find out what sort of stress the crop is below, and the place.

Watch the complete video for tips about how one can scout for wheat stem sawfly, story continues under:

“If you’re at zero to two stems, per 10 stems, you’re at very low pressure, if you’re at two to four, then you’re at moderate pressure, if you’re four plus, per 10 stems, then you’re in the higher pressure area,” says Boychyn, including a normal suggestion that if 15 per cent of stems are affected, to make use of a solid-stemmed wheat selection or durum selection for the next 12 months.

There’s a helpful insect to contemplate that assaults wheat stem sawfly, referred to as Bracon cephi, that lives simply above wheat stem sawfly. Reducing top at harvest, above roughly 15 cm (six inches) will preserve that helpful insect within the crop.

Earlier than seeding subsequent 12 months, extra aggressive or doing two passes at harrowing may additionally management wheat stem sawfly, says Boychyn.

Relying on the stress of wheat stem sawfly, Boychyn additionally recommends to swath the surface rounds, or the entire area, in order that high quality and yield are maintained.


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