South Dakota experienced a large number of red sunflower seed weevils this past growing season. SDSU Extension Field Crop Entomologist Adam Varenhorst says weevil numbers were alarming. “Thresholds for sunflowers are four-to-six per head and in South Dakota we see populations of 500 to over 1,000 per head.” Varenhorst said most of the sunflower fields scouted this summer had weevils. Unfortunately, the weevils are turning resistant to treatment. “There are decreased effects of pyrethroid class insecticides.”
News Categories
Latest RRFN Podcasts
Subscribe to RRFN
Get a weekly digest from RRFN to stay up-to-date on all the latest news in agriculture.