Stewarding a New Growth Regulator Herbicide, 2021

 

Brad Hanson, CE Weed Specialist, Dept. of Plant Sciences, UC Davis

This study’s overall summary showed that the simulated off-target herbicide drift data is useful in developing integrated stewardship plans for herbicides such as florpyrauxifenbenzyl and triclopyr in rice fields where they are close to high economic value tree and vine crops in California. California growers in are familiar with stewardship programs for Grandstand herbicide (triclopyr) which has been registered for use in rice for many years. This research suggests that, in general, most tree crop’s sensitivity to florpyrauxifen- benzyl is similar to triclopyr with the exception of pistachio which was more sensitive to florpyrauxifen and grape which was less sensitive. Stewardship plans for Loyant herbicide based on Grandstand risk management are likely to be effective for most crops but extra precautions may be needed if there are nearby pistachio orchards.