Parasitic Or Disease Ulmus Parvifolia

Sergio

Hello,

I need your assistance to identify the disease/parasitic from which my Ulmus
Parvifolia suffers. Initially black spots appear on the leaves. Then they yellow and
fall. In addition, some small "things" seem fixed under certain leafs. You find the
pictures below.


http://sites.estvideo.net/spherecal...arvifolia01.htm

http://sites.estvideo.net/spherecal...arvifolia02.htm

http://sites.estvideo.net/spherecal...arvifolia03.htm

http://sites.estvideo.net/spherecal...arvifolia04.htm


if you have a fast internet connexion, 4 hight resolution pictures :


http://sites.estvideo.net/spherecal...vifolia01hr.htm

http://sites.estvideo.net/spherecal...vifolia02hr.htm

http://sites.estvideo.net/spherecal...vifolia03hr.htm

http://sites.estvideo.net/spherecal...vifolia04hr.htm


Thank you for any hint or explanation.

Friendly greetings

Sergio ;-)

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GaryS

Sergio,

The brown spots are leaf spots (there are so many fungi that infest elm that only an expert can distinguish them).

The insects look like scale which can be controlled with pyrethrum spray or an oil dormant spray when it's dormant.

As a preventative measure you can clean up and keep any dead leaves away from the plant. Not knowing your growing conditions it's hard to say what you should do other than spraying for the scale with a pyrethrum spray.

It can be found in most garden centers. I have a spray called I-bomb which is a good pyrethrum.

Needless to say, the elms have many disease and insect problems.

__________________
GaryS

Sergio

Hi Gary,


thank you for your help.

Sorry, my English is bad, and i'm not shure to understand what fungi is ? very little mushrooms ? ;-)
ok i'll look for pyreturum, may be i can find the solution on the notice...


I'm a newbie ( first year ) in bonsaï care, so it's possible that i give to much water.

But i supervise the watering of my bonsaïs using a precise balance. So i know what's the maxi

and the mini weight of the bonsai. For the Ulmus Parvifolia, i wait until the ground is dry, before

watering again, but may be it's to much for the winter condition. I keep it indoor, because in our

country it can freeze seriously.

What's the right strategy for watering bonsais, considering that i know the weight difference between

dry and wet ?


Cheers

Sergio ;-)