Cedar Elm - Pest/Fungal Issue?

[Apex37]

Started noticing some browning on my cedar elm. Not sure if it’s fungal or pest related. It’s still been fairly warm here and feels a little early for color change. Highs in the mid 80s, lows in mid 50s.

I treated it with Bayer Rose and Flower 3 in 1 about a week ago. I’m wondering if that only works for flowering plants? Not sure.

Any suggestions would be awesome!

 

[Leo in N E Illinois]

Could be summer heat stress, in which case, cooling weather will solve the problem. Also check for mites. Often when I have vague damage, where it is not clearly one thing or another, I look for mites. Spider mites, two spot mites, flat mites, or one of the dozen or so plant juice sucking, nearly invisible (tiny for my old eyes) mites. Remember mites are arachnids, insecticides won't kill them. You need a miticide. Label on pesticide must include mites on the list of target insects. Only spray for mites if you really have mites. A prophylactic spraying can result in accidentally creating pesticide resistant mites.

 

[BobbyLane]

Started noticing some browning on my cedar elm. Not sure if it’s fungal or pest related. It’s still been fairly warm here and feels a little early for color change. Highs in the mid 80s, lows in mid 50s.

I treated it with Bayer Rose and Flower 3 in 1 about a week ago. I’m wondering if that only works for flowering plants? Not sure.

Any suggestions would be awesome!

View attachment 458152
View attachment 458153

Sounds like what we have here, so its for ornamental plants, trees and shrubs. Your leaves look like most deciduous trees look at this time of year, if it is a fungus it wont matter much because the leaves will be dropping soon, unless they were unsightly all season from spring through summer, but you havnt mentioned or shown that.
as a precaution we spray once dormant and again when buds begin to swell, that usually irons out most recurring fungus if done consistently. we also use a winter wash, again once dormant, a few drops of lime sulphur mixed with water in a litre water spray bottle. ive also used this formula when the trees are in full leaf if its a persistent fungus and picked of offending leaves showing any signs.
A bug spray with mites on the label will work for any mites, as Leo mentioned. dusty looking leaves are an indication, ive often mistaken their presence for sawdust after a carving session. easily blasted off with a powerful waterjet like aphids.

 

[Firstflush]

The mottled micro dotted leaves suggests thrips or mites.