hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
Gallery of Plants
Tech Blog
Plant Profiles
Mailing Lists
    Search ALL lists
    Search help
    Subscription info
Top Stories
sHORTurl service
Tom Clothier's Archive
 Top Stories
Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

Unauthorized use of a plant doesn't invalidate it's patent

RSS story archive

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"

To sign-off this list, send email to majordomo@mallorn.com with the

To sign-off this list, send email to majordomo@mallorn.com with the

 © 1995-2015 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index