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Re: Foliar nematodes

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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