Ken from Loveland, Co writes
Fertilome Tree and Shrub Systemic Insect Drench is not labeled for zimmerman moths, only pine tip moth larvae. Zimmerman pine moth is most vulnerable to controls when larvae are active and exposed on the bark in spring and late summer, You will want to fully drench the bark as much as you can on the trees with a product like Tengard SFR. Mid April or so is the best time to apply a product to the trees to try and catch the immature life stages for the best control. You can do this periodically throughout the season but early spring/summer and late fall are the best times to see results and save the trees.
Answer last updated on: 03/13/2017