Grasshopper Workshop Recap – Recording Now Available
April 27, 2022 | View PDF
The grasshopper outlook for 2022 again looks troubling for much of Montana, and especially Richland County. The USDA-ARS Great Plains Laboratory and MSU Extension Richland County hosted a Grasshopper Workshop. The recording of that workshop is now available at: https://richland.msuextension.org/AG.html
Dr. Dave Branson, USDA-ARS in Sidney explained the importance of grasshopper biology and proper identification. The majority of grasshopper species lay their eggs in the soil in late summer and fall, and they hatch in spring and early summer. There are approximately five species of grasshoppers that hatch in late summer and over winter as nymphs. You may be seeing these grasshoppers now, but these species are not of economic concern. The life cycle of a grasshopper is also very important, as control efforts are focused on nymphal stages. Grasshopper species differ in what they eat, making proper identification key.
Gary Adams, USDA-APHIS explained different rangeland treatments and management options for grasshoppers, as well as insecticide control options that include malathion, carbaryl, and diflubenzuron. He emphasized the importance of monitoring grasshoppers on rangelands, with Memorial Day being the time when monitoring should begin. He also discussed cost share programs available with USDA-APHIS.
To conclude the program, Dr. Kevin Wanner, Montana State University Extension explained grasshopper management in croplands. He discussed control options including carbaryl, pyrethroids, and diflubenzuron. He also emphasized you should be scouting for nymphs on field edges in May and June. Dr. Wanner discussed treatment thresholds and treatment options for small grain crops, as well.