Anything new on black vine weevil control?
Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.
At a recent MSU Extension meeting in Ottawa County with some of our nursery growers, the question was asked if we have anything new for control of black vine weevil. I compared notes with Dr. Dan Herms at Ohio State University and we came up with this.
For field production of nursery plants, Talstar as a foliar spray for adult weevils is still the best option. One to three applications a week apart can be made when the adult weevils are first found. Imidacloprid soil treatment can be effective when used at the high rates on the label for landscape plants in mid-August to target young larvae, but the rate for nursery fields (Discus, Marathon, others) is too low to be effective. For container production, a Talstar drench or incorporation of granules into the media can be very effective.