Re: Leaf Spots and Rust, What do you use?
- Subject: Re: [iris-talk] Leaf Spots and Rust, What do you use?
- From: J* J*
- Date: Mon, 02 Oct 2000 15:20:23 -0700
mwnorberry wrote:
>
> A few weeks ago, I left a message on leaf spots and rust. I only got a few comments but never a answer to my question: What do the rest of you use for leaf spots and rust? In an old 1978 Melrose Gardens catalog I found that they recommend "RUST, in coastal areas and the south use PLANTVAX. I visited my local nursery and they didn't know what that was. Can anyone tell me if this product is still on the market and is Melrose Gardens still in business, if so what is there address? Thanks,
Kitty Loberg wrote (previously):
> I used Daconil this year, and it has been very effective, and I have not had
> any waterspots. I use a spread-sticker with it. My experience has been
> to use Daconil exactly as the label recommends. I suppose using it with
> a higher concentration might be a reason for getting waterspots. My garden
> spayer spays a very fine mist, which also makes it invisible on the plants.
> The most important thing to do is to use it as frequent as the label
> recommends. I had to learn the hard way. In previous years, I would do
> it once a month or just a couple of times, and I wondered why I still had
> leaf spot. This year, my good friend Betty Coyle reinforced in my mind
> that you MUST spray EVERY 10 days or as the label recommends. So I started
> in the winter, and I faithfully sprayed every 10 days or thereabouts,
> hoping to get a 24 hour period before it rained again, up and through last
> weekend. AND it has made a world of difference... next to no leaf spot.
> I've learned my lesson.
> Kitty Loberg
> Northern Calif.
John Reeds wrote (previously):
>I highly recommend one product: Green Light "Fung-away". It works great,
>and sprays on clear. Every other leaf spot spray (generally Daconil
>variations) I've used leaves ugly beige waterspots, and if I really wanted
>spots on the leaves, why spray?
>
>John Reeds
Jeff Walters wrote (in part) (previously)::
> "There are two methods of control for fungal leaf spot. The first is to
> maintain a clean and healthy environment. This includes periodic removal of
> browning foliage and dead leaves. In conjunction with this, spray the iris
> in early spring when the new foliage is six inches high with Kocide 101.
> Subsequent spraying with Daconil, Cleary 3336 and Bayleton 25, used in
> rotation every ten days until the weather turns hot and dry will contain
> the disease. Additional spraying after cutting back the foliage in the fall
> is advisable.
>
> Unfortunately, the fungus lives for two years, so if it was present this
> year, it will be back again next year. Begin spraying BEFORE it appears.
> When little or no sign of leaf spot has appeared for two years, spraying is
> only necessary once or twice annually."
>
> I have also used a copper sulfate based fungicide with good results, but
> the copper sulfate solution does discolor the leaves slightly. I also use a
> spreader-sticker in the tank whenever I spray fungicide or herbicide.
>
There are probably several oher fungicides that are available from your
local garden store that will work. You need to remember how leaf spot is
transmitted in order to effectively treat for it. The spores are
generally spread to the leaves by the action of rain splashing from the
ground onto the leaf. The spore infects the leaf and produces millions
of other spores that fall to the ground. So the cycle continues.
Benomyl (Benlate) is another fungicide that works well. I don't know
about the others, but Benomyl is a systemic and does a really good job.
The problem is that it is no longer rated (here in CA) for irises
(meaning the company does not want to spend the money to go thorough all
the testing expense to pass the California EPA regulations). It is still
avaliable in businesses that carry agricultural products.
John | "There be dragons here"
| Annotation used by ancient cartographers
| to indicate the edge of the known world.
________________________________________________
USDA zone 8/9 (coastal, bay)
Fremont, California, USA
Visit my website at:
http://members.home.net/jijones
President, Westbay Iris Society
Director, Region 14 of the AIS
Chairman, AIS Committee for Electronic Member Services
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