In a 2017 Alberta survey, 13% of the kochia populations sampled were fluroxypyr-resistant. Only 4% of the populations were both fluroxypyr- and dicamba-resistant, indicating that different mechanisms may confer resistance to these herbicides. When combined with estimates of dicamba resistance, about 28% of kochia populations...

The most effective and consistent treatments for glyphosate-resistant (GR) kochia management included Authority (sulfentrazone) applied pre-emergence, post-emergent Enforcer D (fluroxypyr/bromoxynil/2,4-D) at the high label rate, and post-emergent Infinity (pyrasulfotole/bromoxynil). Glyphosate-resistant (Group 9) kochia has rapidly spread across Alberta since it was first discovered in 2011 in...

Effective pre-emergent or pre-emergent followed by post-emergent (two-pass) programs tested in this research on the U.S Great Plains should be proactively utilized by growers to manage glyphosate/dicamba resistant kochia in Roundup Ready 2 Xtend (glyphosate/dicamba-resistant) soybean. A similar approach may prove useful for western Canadian...

Time to 90% loss of glyphosate-resistant kochia seed viability averaged less than 8 months. Short seedbank longevity, delayed and reduced germination, and delayed time to first leaf of glyphosate-resistant kochia can be used to develop weed control strategies. Kochia herbicide resistance continues to spread across the...

A kochia survey in southern Alberta in 2017 found that all kochia populations were resistant to Group 2 ALS inhibitors, 50% of populations were resistant to Group 9 glyphosate, and 18% of populations resistant to Group 4 (dicamba) herbicides. Kochia populations with triple resistance to...