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: Blyth irises

  • To: Multiple recipients of list <iris-l@rt66.com>
  • Subject: Re: CULT: Blyth irises
  • From: Rick Tasco/Roger Duncan <randrcv@sierratel.com>
  • Date: Thu, 11 Sep 1997 22:01:23 -0600 (MDT)

Marylou G. Gibson wrote:
> .
> >
> >I have never had any type of rot during our winters, but I spray twice a
> >month for leaf spot, which likes our cool and wet winters.
> >
> >Rick Tasco
> >Superstition Iris Gardens
> >Central California
> >Zone 8
> >
> Dear Rick,
> What is leaf spot and what do you spray for it?
> Marylou Gibson
> Carlsbad, CA  Zone 10


Leaf Spot is a fungal disease of mainly bearded iris, although I have
seen it to a lesser degree on Louisiana's and Spurias.  Small circular
to oval spots looking watery or greasy appear on the leaves.  After a
day or two these enlarge and turn yellowish to brown and often develop a
distinct red-brown border.  If plants are severely infected, leaves may
die back from the tip and the lack of green foilage may affect flower
stalk size, bloom size and general vigor of the plant.  However, the
disease is not lethal.  The fungus becomes a problem during wet seasons
of the year when temperatures are above freezing.  

I spray my iris during the winter which is our rainy season.  Usually
our winters are mild enough to promote this disease.  During some colder
spells I have noticed that the Leaf Spot will be arrested.  However I do
spray every 10 to 14 days usually from late October through March.  I
rotate about 3 fungicides which are listed for leaf spot.  Daconil, Fore
and Bayleton.  I once used Benlate, which was very good, but iris was
removed from the label.    

Rick Tasco
Superstition Iris Gardens
Central California
Zone 8

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index