Rogor defoliation.

Jow · Post by **Jow** » January 27th, 2016, 4:51 pm

I am guessing a spray of rogor a couple of days ago is the cause of this elm suddenly defoliating itself. It's basically dropped green healthy leaves.

The rogor has certainly helped with my trident thrip issues but the elm doesn't seem to have liked it.

Any ideas to the contrary?

ImageUploadedByTapatalk1453877470.450154.jpg

ImageUploadedByTapatalk1453877484.824934.jpg

Gerard · Post by **Gerard** » January 27th, 2016, 6:02 pm

I have had the identical experience about 5 years ago. Mid summer and a completely defoliate do elm (Jacqueline Hillier) it did not recover fully until the following spring. Perhaps it is rogor or possibly systemics in general. In recent times I have used confidor very reservedly but elms never get rogor

Jow · Post by **Jow** » January 27th, 2016, 6:10 pm

Thanks for the info Gerard. Hopefully this corky bounces back. It's been a pretty strong grower previously and has been growing into a nice bonsai so it would be a shame to lose it or any branches.

Pup · Post by **Pup** » January 27th, 2016, 7:15 pm

I have found this with Elms in general, their lack of tolerance to systemic pesticides has seen me ridiculed here for just that.

So it seems I might be right after all, although most times they recover, but hot weather does put up some problems.

Good luck.
Cheers Pup

Jow · Post by **Jow** » January 27th, 2016, 7:22 pm

Cheers pup.

treeman · Post by **treeman** » January 28th, 2016, 10:50 am

I think they use confidor to control elm leaf beetle so maybe that's the go?

Mojo Moyogi · Post by **Mojo Moyogi** » January 28th, 2016, 11:55 am

Hi Joe, hope your Corky bounces back.

http://www.planetnatural.com/pest-probl ... s-control/

Cheers,
Mojo

Jow · Post by **Jow** » January 28th, 2016, 12:39 pm

Thanks guys. Fingers crossed and lessons learned.

robc · Post by **robc** » January 28th, 2016, 1:01 pm

i haven't gone near my English elms with anything systemic in a few years. Confidor caused leaf loss in otherwise very healthy trees. i havent tried it on any other elm spp, but it sounds like many others have had similar experiences

Jow · Post by **Jow** » February 3rd, 2016, 8:57 pm

Well it looks like it's bouncing back. It's full of new buds and seems to have not really missed a beat.

Sure was an easier way to defoliate then scissors but probably not recommended.

Haydenmc · Post by **Haydenmc** » February 3rd, 2016, 10:27 pm

I remember having a discussion with QV about defoliating Chinese elms and he said he would never bother, but if he had to a quick spray of confidor would be the way to go....so it's probably only been as stressed as though it had gone through a standard defoliation

AusBonsai

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