stem-mining weevils Archives | Alberta Farmer Express

Distinct markings give adult gall flies a rather striking appearance, while their larvae are anything but attractive. But they can do serious damage to a Canada thistle.

Tiny warriors get nasty on Canada thistle

Stem gall flies love to feed on — and breed in — the much-loathed and fast-spreading invasive weed

By Alexis Kienlen May 16, 2019

Reading Time: 2 minutes The West Central Forage Association has another biocontrol that can help you win the war against Canada thistle. The proud warriors are called stem gall flies and they’re available for sale. “The gall flies act on a different portion of the Canada thistle than the weevils do,” said Rachael Nay, conservation agriculture and extension program […] Read more