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Re: Need help on leaf blight/spots

From: Bill Shear <BILLS@hsc.edu>

Hey there, M. W. Norberry.

I would second Sterling's advice.  Selecting resistant varieties, keeping
old foliage cleaned up, avoiding overhead watering and making sure your
plants are not crowded (to enhance air circulation) will go a long way
toward making leaf spot diseases less of a problem.  It also helps to cut
off any badly infected leaves even before they wither.

In really intractable cases, a fungicide could be used.  You can get
recommendations of specific brands from your county agricultural agent, but
probably few to no fungicides have been specifically approved for use on
irises (this doesn't neccesarily mean that they won't work or are
dangerous, just that the required tests have not been done).  Probably
other members of this group can give you the brand names of some products
that work for them.

Fine as it is, the Kohlein book was written for European gardneners, and
the English edition is simply a translation of the original German one.
Thus many of the recommendations are not possible, obselete, or
inappropriate for North American gardeners.

You need a book that is aimed specifically at beginning iris growers in
North America.  You can order THE GARDENER'S IRIS BOOK, published in 1998
and written by yours truly, from Amazon Books at http://www.amazon.com. It
retails for $25, but Amazon sells all their books at a 20% discount.  And
you will help a poor iris addict support his costly habit!

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

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