Agronomic Crop Insect Scouting

David Owens, Extension Entomologist,

While I have not received any reports of armyworm activity in small grain, be advised that the window for using a pyrethroid is just about closed. Mustang Maxx’s PHI is 14 days. If a treatment is deemed necessary inside this window, Prevathon has a shorter PHI.

Bean leaf beetle and grasshoppers are active in soybeans. Grasshoppers may be more easily controlled when young with pyrethroids, but in last year’s spray trials targeting mid-sized grashoppers, efficacy was only achieved using dimethoate, Prevathon (with methylated seed oil per label recommendation), and Elevest (chlorantraniliprole + bifenthrin), and I have no reason to believe Besiege wouldn’t also have similar efficacy.