A herbicide used mainly against volunteer wheat, durum and barley and wild oats in canola and pulse crops is now cleared to fight foxtail barley.
Assure II, whose active ingredient quizalofop p-ethyl puts it among the “fops” in herbicide Group 1, has picked up the additional weed on its label. Its maker DuPont Crop Protection now bills it as the “most effective herbicide to control foxtail barley in canola, flax and pulses.”
Assure II is to be applied at a rate of 0.5 litres per hectare (0.2 litres per acre) and provides 99 per cent control at the three- to four-leaf stage of the weed and 97 per cent at the one- to three-tiller stage, the company said.
The product is registered for use in canola, camelina, chickpeas, dry common beans, flax, lentils, peas (field and processing), seed alfalfa, seedling legumes, soybeans and sugar beets, among other crops.
Assure II will allow growers to seed into cleaner fields when wheat comes up in their rotations, the company said in a release Monday.
“There are no selective herbicides available to control foxtail barley in wheat,” Andrew Stone, product manager for DuPont, said in the release. Assure II, he said, is a means for growers “to manage this prolific weed within their weed control system and crop rotation.”
Foxtail barley germinates in the fall and thus emerges early in the spring, making it tough for zero-tillers to control with just a spring hit of glyphosate, the company said.
Getting control of the weed, DuPont said, is usually “a multi-year process to decrease the seedbank.”