Yellowing elm leaves.

noissee

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This elm was repotted in early spring (late feb.) and has been healthily growing. I noticed some red mites a few days ago and sprayed with insecticidal soap. Haven't seen any bugs, but this morning I noticed some yellowing leaves. Any ideas on what might be causing this?
Thanks.
Nick.
 

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TheSteve

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Damage from the mites kicking in? What kind of insecticide did you use? Soap's usually harmless but....
 

noissee

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The brand name is "Safer" It is "insect killing soap, with seaweed extract"
The only trees I've ever had mites in are Junipers, and they react differently, so I wasn't quite sure if this was mite damage or not. Thanks for the reply.
 

TheSteve

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Safer's is good stuff so I doubt that's the problem.
 

chappy56

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My humble opinion would be that your tree is lacking something.
Fertilizer, sunlight, maybe even iron.
 

noissee

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update

Steve: No it lost its leaves in winter.

This tree is doing fine...lots of new growth.

It had gotten too much water.
 

chappy56

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Mine have done the very same thing. Although they have new growth coming on now.
I seem to have heard that elms sometimes have two growing seasons from time to time.
At least thats what I'm counting on. Good luck.
 

TrsH

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i had this with my first ulmus.
when you even think about touching the yellow leaves they fall off even when you're only thinking of touching one.

i had this with my ulmus coz i was keeping it inside.
after that i put it outside and never had those yellow leaves again except for 1 yellow leave each month.

maybe a lack of sunlight and aircirculation is causing your problem.
 

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