Piotr from Albrightsville, Pa writes
Bonide Mancozeb Flowable with Zinc Concentrate would not be recommended. For dothistroma needle blight it appears a copper fungicide would be recommend to protect new needles from infection. There is also a guide below that might help
https://extension.umn.edu/plant-diseases/dothistroma-needle-blight
Answer last updated on: 03/05/2020