Been there done that... I sprayed my citrus about a month ago and decided to "test" the spray on my bonsai. No one minded it... except my Japanese maples. Oh well - live and learn
Did that with my trident last month as a knee jerk reaction to anthracnose and now it is essentially bare. Have been keeping it in full sun since June specifically to get maximum fall coloration.
Sorry about your tree, at least no lasting harm was done.
That sucks! I've had similar issues with some of my trees. The only thing I can think of is the company that does my lawn fertilizing and weed control is spraying them accidentally. I just don't know.
Had a last little bit of anti-fungal from my apple trees that I decided to just mix up for one last application on my bonsai. Next day, burn on all the trident maples.... You are in good company.
So my pear tree suffered a spray burn. It should be fine but the fall colors are not going to be there this year which sucks. It is putting new growth, but that'll only have time to put maybe one set of leaves before it gets to cold.
Wasn't clear to me, what did you spray them with?
A fungicide, sprayed all my trees but I did this one last. I'm thinking it just got a concentrated dose.
I stopped spraying my Fruit trees including Pears for Fungal issues. I water in a Sulfur solution three times a year and they have done very good, even broke a Cedar Rust cycle. I might switch up with a Daconil soil drench next year every other time. One of the reasons I tried a lot of things other then spraying is when I did some damage to my left eye which took over a year to heal, damn wind.
I am not saying I never spray other smaller plants but I find the drench works on many of them too.
Grimmy
Fwiw, I have had leaves here and there on my palmatums and tridents that clearly had mild fungal issues all season long, and maybe a bit more obvious this mid to late summer, but I stopped spraying back in late August as the last flush of growth was hardening off. I figured that the infected leaves were permanently infected/can't be cured, and would be falling off in 6-8 weeks ( October) regardless of what I'd do- and spraying at this point wouldn't really do anything to prevent future problems. Cleaning the soil of any fallen leaves and applying a dormant spray like lime sulfur before putting them away for winter could certainly reduce the potential exposure to the spores as the tree breaks dormancy next spring.
I do that as well, this is just part of my fall maintenance and never had had a problems before.