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

Well, Char, sort of <g>

As I described in the post about weather woes, I see leaf spot related
to freeze damage. I also see massive leaf spot consistently on certain
cultivars (and on certain seedlings of my own).  Little or no leaf spot
so far in the ridgetop clay garden.  No leaf spot in the grass infested
beds (also very little iris bloom!).  Varying amounts of leaf spot in
the rows with varying amounts and species of weeds/companion plants.
Definitely affected by weather - more in rainy and hot humid weather.
Probably affected by nutrition - worse with more nitrogen, I suspect.

I thought there might be a relationship between the amount of leaf spot
and aphid damage.  And generally, I suspect it's worse when plants are
stressed, as in high humidity, heat and drought on my gravel soil.

I am trying to select for cultivars that thrive without 'cleaning' and
in mixed beds, so the large majority of cultivars I am currently growing
are pretty tolerant of weeds and lack of air circulation around the base
of the plant.  Today, I noticed one cultivar that has yellowed up and
seems to have a major attack of leaf spot and suspect it is also
rotting, but haven't inspected it closely in this cold drizzling rain.
It has had some rot problems in the past, so may be on its way to the

I don't distinguish between bacterial and fungal leaf spot - don't treat
for either, plants just have to do the best they can here.

How's that for a wishy washy answer?

<Do you really believe this?  I had a lot of weeds last year due to
                   full time.  Also, no companion plants to speak of.
And I had leaf spot.

                   The year before, I had very few weeds, I was
unemployed and many companion
                   plants.  No leaf spot.

                   Char Holte, New Berlin, WI (Near Milwaukee)>
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