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Foliar Nematode Photo ID

This is in response to Jan Hibner's question;

"So, what part of these hosta leaves are "nematodes"?

The nematode damage is visible as the darkened sections of the leaf.
This damage does not cross the leaf vein. It is my understanding that
the darkened areas are caused by a secondary fungal infection that is
carried on the nematode and not by the nematode's feeding activity
directly. The foliar nematode is small enough that it can enter the leaf
through the leaf's stomata(gas exchange port) and spends part of it's
life cycle in the hosta leaf where it feeds on leaf tissue between the
upper and lower epidermis called the mesophyll. Foliar nematodes may
over winter in hosta leaf debris and also in the hosta crown. Some may
also over winter in the soil near a plant. Putting infected leaves in a
compost pile is a big mistake and an excellent way to spread foliar
nematodes around your garden.

There are many plants that are susceptible to foliar nematodes. Ferns
have a webbed vein pattern and foliar nematode damage will look like a
map of the United States with some of the States marked with the brown
color seen on the infected hosta photo.

Foliar nematodes can spread in splashing water or by a gardener touching
wet plants and moving around in the garden. Divisions from hostas that
have foliar nematodes will also have foliar nematodes. Foliar nematodes
will spread from infected hostas to nearby hostas, especially if the
leaves touch. Morning dew may aid in this movement.

Dan Nelson
Bridgeville DE
zone 7

----- Original Message -----
From: Jan Hibner <janh@infocom.com>
To: <hosta-open@mallorn.com>
Sent: Saturday, October 09, 1999 10:22 AM
Subject: Re: October Hostas

So, what part of these hosta leaves are "nematodes"?


> Hi Gerry!
>Here it is.
>Attachment Converted: "C:\Eudora\Attach\Foliar Nematodes.jpg"

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