Re: Re: CULT: diseased foliage
- To: i*@egroups.com
- Subject: Re: [iris-talk] Re: CULT: diseased foliage
- From: B* S*
- Date: Fri, 26 May 2000 09:51:53 -0400
I suspect the story about keeping leaf spot out for two years and then
being rid of it is true.
I have modest leaf spot problems in my garden where irises have been grown
for many years. Most of the time it is minor (major this year!), but I am
probably not as meticulous as Anner in keeping it down. I think her
suggestion about getting the stuff out of the garden is especially good.
Now out here at school I have put in a modest iris planting where none have
ever grown before. With about the same conditions as in my home garden,
there is nary a spot anywhere and has not been. The plants placed there
did come from home, but had most of their foliage cut off.
I seem to recall that the spores of leaf spot are not windborne but fall to
the ground or remain on dead leaves, then reach new hosts by being splashed
up by rain. This does fit the pattern. It also seems likely that as with
many water and soil-borne fungi, the spores are not long-lived, so no
"spore bank" builds up in the soil.
Bill Shear
Department of Biology
Hampden-Sydney College
Hampden-Sydney VA 23943
(804)223-6172
FAX (804)223-6374
email<bills@mail.hsc.edu>
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