We have 25 hackberry trees in our yard ranging from 3 originals, we've been there 45 years and the rest we have planted over the years bare root. This year they all seem to be slowly dying, except the original 3 seem to be untouched. The browning seemed to start at the top of the trees and move down. Do you know of anyone else with issues? We changed our weed spray this year that we use for lawn weeds from curtail to Grazon that we purchased I believe at Lake Park Triangle Agronomy and are wondering if that could be killing our trees .My husband thinks it is root uptake being they are dying from the top down. No other tree variety seems to be affected. We live on hwy 10 between lake park and Hawley, clay county. We would be devastated to lose 25 beautiful hackberry trees. Steve & Laurie Knutson
Clay County Minnesota
It is possible that the trees are suffering from Grazon toxicity.
i also found this from Texas AG.
For that reason, I wouldn't spray picloram around any tree or bush you really cared about.