Tree pest care
I live in the foothills outside Denver, CO at ~7500 ft.elevation. Do I need to spray my aspen tress for Marssonina leaf blight? Also should I continue to spray for Mtn. Bark Beetle? I have sprayed for both in the past.
Jefferson County Colorado
Thank you for your questions. I am sorry for the delay in getting you an answer. Here is information on the first: http://planttalk.colostate.edu/topics/insects-diseases/1476-marssonina-leaf-spot/ The options for mountain bark beetle are slim to none, per this Extension article: https://extension.colostate.edu/topic-areas/insects/mountain-pine-beetle-5-528/ If you have other questions, I suggest you contact your county Extension office directly, and their info is here: https://jeffco.extension.colostate.edu Good luck!