Re: Foliar nematodes
- To: hosta-open@mallorn.com
- Subject: Re: Foliar nematodes
- From: G*@aol.com
- Date: Tue, 7 Jul 1998 13:27:45 EDT
Thought some of you would find this of interest. Below is an excerpt of an
article written by Jody Fetzer, IPM at the Minnesota Landscape Arboretum.
Glen UK
<<To take additional
steps to diagnose foliar nematodes, first, realize that you can see them.
The best way to confirm their presence is to break or cut open the
leaves showing symptoms (necrosis and/ or chlorosis between the
veins). Put some water on a piece of clear glass or a clear glass
dinner plate (or petri dish). Let the cut edges of the leaves stay
in contact with the water for 10- 30 minutes. Then back light it
(hold the glass over a lamp so the light shines through the water and
leaves). You will see the very tiny nematodes snaking and swimming
out of the leaf tissue. If you have a dissecting scope, focus on the
bottom of the water because the nematodes will "settle out". Foliar
nematodes are a serious problem and require much more extreme
measures (as you detailed) than a foliar fungal disease. For this
reason it is very important to CONFIRM their presence in your hosta
by actually seeing the creatures. A good pair of reading glasses or
a magnifying lense will help if you can't quite make them out with the
light alone.>>
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