Diamondback moth infestations are devastating brassica crops along California's Central Coast, with growers facing significant losses and rising costs. The pest has developed resistance to many insecticides, and a new product, Plinazolin, remains under review by state regulators.
- The diamondback moth larvae cause extensive damage to broccoli, cauliflower, Brussels sprouts, and cabbage, leading to field losses and economic nonviability. - Growers in Monterey County and other areas saw insecticide use increase by over 70% in 2024, with some fields completely unharvested.
- Plinazolin, a new insecticide registered by the EPA, is effective in other states but is still under review by the California Department of Pesticide Regulation, putting local growers at a competitive disadvantage. - Mild winter and warm February temperatures have exacerbated the pest's life cycle, leading to earlier and more severe infestations.
The delay in approving Plinazolin highlights regulatory challenges in California, where growers must rely on existing methods and face higher costs compared to other states.