The best time for control of the first generation larvae is a spray 10 days following peak flight of the insect. For those of you that treat for this insect, the OPTIMUM day for control will be on April 22, 2022 for the Wichita area. Note that growers further north will spray later. Watch the Snowdrift crabs for timing.
This is a pest primarily of scotch, ponderosa and mugo pines. Thanks to Windy Knoll Tree Farm for monitoring of this pest. We realize that not every susceptible tree cannot be sprayed on the same day, but for Christmas tree growers it is best to treat the scotch pines on that day if possible. (Ward Upham)