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
New Trillium species discovered

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

RSS story archive

Re: CULT: Leaf spot resistance

Here, leaf spot (the 'summer crud") resistance seems to be a gradient
from <vulnerable to the point of death without treatment> to <nearly
total resistance>.

All the cultivars I've found so far that fall into the near total
resistance category here are either Lloyd Zurbrigg or G.P. Brown
introductions.  These also tend to be some of the most tolerant of
erratic spring killing freezes (at least as far as foliage goes - some
with worse foliar damage may bloom more reliably).

However, there are many cultivars that are reasonably leaf spot
resistant.  Look for cultivars that have been hybridized (selected)
under your climate conditions.

Some of the best I've tried here so far include SUMMER OLYMPICS
(ancestor of I REPEAT, which I haven't tried yet), GRAND BAROQUE,
healthy), SUMMER GREENSHADOWS.  It's pouring down rain again, or I'd go
out and check for more.

The only two of these I've made many crosses with are IMMORTALITY and
HARVEST OF MEMORIES.  From the relatively small number of seedlings I've
raised from these so far, it looks like super disease resistance is,
unfortunately, <not> a dominant trait.

I'm happy to see this thread come up again.  I posted photos at the
beginning of crud season showing the range of foliar health here a while
ago, hoping to hear from others interested in hybridizing more disease
resistant cultivars, but didn't get much feedback.  The photos didn't
make it from Yahoo to the archives (posted three photos at once) - let
me know if anybody wants to see a 'resistant' vs 'vulnerable' plant for
this time of year.
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.korrnet.org/etis>
American Iris Society web site <http://www.irises.org>
talk archives: <http://www.hort.net/lists/iris-talk/>
photos archives: <http://www.hort.net/lists/iris-photos/>
online R&I <http://www.irisregister.com>

To sign-off this list, send email to majordomo@hort.net with the

Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement