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Re: CULT: Marigolds and Nematodes.

From: Bill Shear <BILLS@hsc.edu>

Thanks, John, for the good sense about marigolds and nematodes.  Summing up:

1. Nematodes are slowly killed by chemicals released from the roots of
some, but not all, marigolds.

2. Tilling in at the end of the year is not neccessary to get the control.

3. Marigolds require at least 100 days to kill nematodes, so most of the
benefits are realized in subsequent seasons.

4. BUT many people are still skeptical about the efficacy of marigolds.

5. (added by me) Nematodes are a problem on irises only in the SW USA where
soils low in organic content favor their development.  In most of the
midwest and NE, or where soils contain much organic matter, nematodes are
unlikely to be of concern.  Organic matter in soil helps to support fungi
and other nematode predators, which keep nematode numbers low.

6.  There is a lot of information on nematodes in the archives.

Bill Shear
Department of Biology
Hampden-Sydney College
Hampden-Sydney VA 23943
FAX (804)223-6374

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