– Aaron Wilson, Kelley Tilmon, Mark Sulc, and Andy Michel, OSU Extension

Accumulated growing degree days (base 48°F sine calculation method) for January 1-May 2, 2022
Finally we’ve accumulated enough heat units that significant parts of Ohio are now or very soon will be in prime time for alfalfa weevil. Peak larval activity and feeding damage occur between 325 and 575 GDD.
In short, most locations should begin scouting, especially in fields that were damaged last fall by the fall armyworm, because we don’t want to add more insult to those fields early this season. Alfalfa fields should be scouted weekly for weevils until at least the first harvest. Follow-up scouting may be needed after the first harvest in heavily infested fields.
Spot problem fields early by checking alfalfa tips for feeding damage – small holes and a tattered appearance. Fields that have a south facing slope tend to . . .
Continue reading Alfalfa Weevil: Ready, Set, Scout!

