Honey Locust leaves dying - Ask Extension
Over the past 4-5 days my two mature honey locust trees have had their leaves strat curling and dying off. It has impacted over half of the tree withi...
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Honey Locust leaves dying #872484
Asked June 10, 2024, 5:34 PM EDT
Over the past 4-5 days my two mature honey locust trees have had their leaves strat curling and dying off. It has impacted over half of the tree within days. Can you advise if there is something I can do to treat them to prevent them from dying?
Larimer County Colorado
Expert Response
Hi Barb,
Very interesting - would you be able to send me any close-ups of the browning foliage? It's really hard to zoom in enough to make a determination.
Has the rock been sprayed or treated with anything last fall or this spring? If so, what product was used?
Thanks!
Very interesting - would you be able to send me any close-ups of the browning foliage? It's really hard to zoom in enough to make a determination.
Has the rock been sprayed or treated with anything last fall or this spring? If so, what product was used?
Thanks!
Hi,
We haven’t done anything different that I am aware of. Here are some additional pictures. 
Thanks,
Thanks,
Barb
On Jun 10, 2024, at 4:28 PM, Ask Extension <<personal data hidden>> wrote:
Hi Barb,
Thanks for the additional photos. What is puzzling to me is from one of the first photos you sent - #4417 - because if you look at the tree, the half that's closest to the rock has more browning compared to the other half. This kind of leads me to something being potentially sprayed in the rock and was absorbed the roots of the tree. The one close-up of the leaves shows some curling of the terminal leaflets.
Do you do weed control in the rock?
This also could be plant bug or honeylocust spider mites. I'm going to send a couple photos to our entomologist to see if he has any thoughts.
Thanks for the additional photos. What is puzzling to me is from one of the first photos you sent - #4417 - because if you look at the tree, the half that's closest to the rock has more browning compared to the other half. This kind of leads me to something being potentially sprayed in the rock and was absorbed the roots of the tree. The one close-up of the leaves shows some curling of the terminal leaflets.
Do you do weed control in the rock?
This also could be plant bug or honeylocust spider mites. I'm going to send a couple photos to our entomologist to see if he has any thoughts.
Hi again,
I consulted with our retired state entomologist and he confirmed that it's not insects. He also suspects it's herbicide.
At this point, focus on good cultural practices and reducing stress.
I consulted with our retired state entomologist and he confirmed that it's not insects. He also suspects it's herbicide.
At this point, focus on good cultural practices and reducing stress.
