I've found that at the end of the day sometimes nature just does whatever the hell it wants. There have been times when I've done everything 100% by the book and come back later in the year and the invasives I have been working on were resprouting like crazy. Then ill go check another job where the exact same thing was done and no resprouting at all. Either way, it's never a one and done deal for invasive species management. Its always a work in progress. I try to explain this to some of the NR workers straight out of college, not all answers are found in a text book. 1+1 doesn't always equal 2 in the natural resources management world. Experience is the best education.Down here we have Crate Myrtle trees that people plant in their landscapes. They're similar to a sumac in growth rate and species. If you cut one down it goes into defensive mode like the tree of heaven and sends up hundreds of shoots from the roots. I cut one down, drilled 1 inch holes in the top of the stump and poured straight 40% glyphosate in the holes and put a tile over it to keep rain out. The sucker still sprouted!
Another three I cut down and painted the top of the stumps with undiluted imapyzere. View attachment 194561
Worked on 2 out of 3.
View attachment 194562
I will say that I did quite a bit of hack and squirt on the acre behind my house and the imapyzere did a fantastic job. It does not however work on pine trees. I think it's because when cut the pines immediately sap and wash the cut amd seal it which is what they're supposed to do.
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