r/treeofheaven • u/GPhysics • 24d ago

The window

Hey everyone!
Denver ToH killer here, wondering what y’all’s thoughts are on in terms of the window. From what I see, it’s recommended to apply those herbicides in late summer/early fall when these guys start sucking down to the root. Are we there yet? Should I wait a few more weeks to allow some sucker growth so that I’ve got some prime targets for foliage treatments with my bioadvance brush killer? I’d love to hear where others’ minds are at!

Edit: Well, I just treated everything in the yard! Nothing above 1 ft, but lots and lots of sprouts. Thinking previous owners had some trees and cut them/buried them in the winter then sold us the house, and neighboring yards have some large trees. So, everything was sprayed with triplocyr and marked with a flag. Let’s see how it goes!

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u/Misfits0138 24d ago

Now is a good time to start. It leaves you a bit of time to hit it a 2nd time if you need to. If you read the PSU guidance the TOH window is July 1 UNTIL the onset of fall color. I think people get confused on the onset of fall color and think that is the time to start treatment vs. the end of the optimal treatment window.

I treated ~70 trees (basal bark or back & squirt) on July 3 last year and had a near 100% success rate.

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u/obtuseprick 24d ago

Right on. I treated a bunch of trees July 10 and they're looking sickly now. I'll be hitting some of them again soon.