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Buxus problem

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Post  Hans Vleugels Sun Jun 12, 2011 12:24 pm

Hi all,

I could use some help in identifying a problem I have with one of my Buxus, and how to treat it... Neutral
I have this problem where some branches are dying off. I made some pictures to show the problem.

Almost completely dead branch with some new growth on the tips of the twigs.

Buxus problem Buxus_11

The red circle shows the top of a damaged leaf

Buxus problem Buxus_12

And some detailed photos of fallen leaves at different stages:

Buxus problem Buxusb10

Buxus problem Buxusb11

Buxus problem Buxusb12

First, is this a fungus? Or is this a different kind of insect or mite?

Thanks for your help!




Hans Vleugels
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Post  JimLewis Sun Jun 12, 2011 2:51 pm

Looks like some kind of scale to me. But I don't see the living scale. Those leaves just show what is left behind.

It is, at least, some kind of a sucking insect. That's what a severe infestation does to leaves and branches.

You need to do a careful examination of healthy leaves and branches. You may need a hand lens.
JimLewis
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Post  Nina Tue Jun 21, 2011 1:01 am

I can't see the symptoms nearly well enough. I see sooty mold, which is a fungus that feeds on honeydew from scale insects, so I'll guess scales are present. I see what looks like fruiting bodies of Macrophoma, a fungus that attacks senescent buxus leaves, but it's an indicator of stress, not really a problem in itself. So I'm going to guess that this tree is being stressed by scales.

Nina
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