nov-dec-2019

He concluded that a sequential approach to weed control offers better results than a single winter application, at lower cost and with less environmental impact. “When herbicides are applied to soil in January, they begin to degrade immediately and are no longer effective when most needed, so growers have been applying more, but doing so in January when weeds emerge in July is not effective. So why not add more pre-emergent later in the season to control weeds and summer grasses ? ” Prowl increased summer weed control and applying it in a sequence with the right timing was more effective than a single application at a higher rate. “Two quarts of Prowl per acre in the spring is better than four quarts in the winter,” he explained. “Take your shots at the seedling stage.” In areas where summer weeds are a major issue, shift more Prowl to later applications. It can be useful when winter weeds are a problem. Hanson was pleased to say that there are more pre-emergent materials available now which helps growers create a mix that works for them, so they have better results with their weed resistance management through herbicide rotation and herbicide combinations. For more information, visit Dr. Hanson’s web page at hanson.ucdavis.edu, the Hanson Weed Management Lab or email him at bhanson @ ucdavis.edu . Blue Diamond Growers does not endorse or verify statements made by advertisers within this publication. 3 1 N O V E M B E R – D E C E M B E R 2 0 1 9