Betr: Re: Help: RUST

Mon Aug 30 23:53:27 CEST 2004

Dear Jim,

Be aware that many (if not all) of the below mentioned fungicides are eit=her
banned or not avalaible to amateur growers in the UK, Holland and many ot=her
countries in Europe due to legislation. For us there are very little alte=rnatives
but to destroy infected plants (although I have not heard of many Europea=n
growers faced with Arisaema rust)

Pascal

>-- Oorspronkelijk bericht --
>Date:         Mon, 30 Aug 2004 08:25:40 -0500
>Reply-To:     "Arisaema Enthusiast Group (AEG) Discussion List (and othe=r
>hardy              Aroids)" <ARISAEMA-L at NIC.SURFNET.NL>
>From:         "J.E. Shields" <jshields104 at INSIGHTBB.COM>
>Subject: Re: Help: RUST
>To:           ARISAEMA-L at NIC.SURFNET.NL
>
>
><html>
>Mike,<br><br>
>I'm very glad that you told us this.=A0 You see, daylily rust also
>grows only in the above-ground parts of those plants, and we growers in
>the Northern USA do not have a problem with daylily rust because it does=
>not persist in the daylily plants through our defoliating winters.=A0
>It is a serious problem in the Southern USA because the foliage on most
>plants does survive the winters there.<br><br>
>There remains the matter of alternate hosts.=A0 Daylily rust and many
>other rusts have an obligatory alternate host.=A0 In the case of
>daylily rust, the alternate host is the only host on which the rust can
>generate spores of a type that will survive the winter.=A0 No
><i>Patrinia</i> (the daylily rust alternate host), no rust next
>season.<br><br>
>As an alternative to decapitating the foliage from a rust-infected
>Arisaema, there are numerous systemic fungicides available that can keep=
>a plant healthy though infected.=A0 Besides the legendary Benlate
>(a.k.a. benomyl) there are still Bonomyl or Cleary 3336
>(thiophanate-methyl) which is an excellent one; Banner Maxx; Immunox; an=d
>several others in a wide variety of different chemical classes.=A0
>Systemic fungicides do not as a rule cure the infection.=A0 They do
>prevent it from spreading farther through the tissues within the infecte=d
>plant, and they prevent sporulation, so it cannot spread to near-by
>healthy plants.<br><br>
>As a protective agent, you can spray uninfected plants in the vicinity
of
>an infected plant with Daconil, a surface-contact sporicide that does
>not, however, have any effect on the internal rust fungus within the
>leaves.=A0 It provides an important barrier that prevents spores of
>the rust from invading healthy plants.<br><br>
>A general regimen for controlling rust in a planting is to spray every
>two weeks with a mixture of systemic fungicide plus a contact
>sporicide.=A0 It is recommended that one alternate between two
>different systemic fungicides to help avoid the rust's becoming
>resistant.<br><br>
>For an extensive discussion of Daylily Rust, look at:=A0
><a href="http://www.ncf.ca/~ah748/rust.html" eudora="autourl">http:/=/www.ncf.ca/~ah748/rust.html</a>=A0
>a site created by Sue Bergeron.=A0 This and a few other relevant links
>can be found in The Daylily Place at:=A0
><a href="http://www.shieldsgardens.com/DLPlace/daylily-rust.html" eudo=ra="autourl">http://www.shieldsgardens.com/DLPlace/daylily-rust.html</a=><br><br>
>I have had no encounters with Arisaema Rust so far, but it appears to me=
>that the situation is by no means hopeless.=A0 However, if you are
>truly afraid of chemical treatments, then by all means do destroy all
>your plants in the area of any outbreak of infection.<br><br>
>There is great virtue in repeating old information in new postings, as
we
>almost always provide additional information in the "repeat"
>posting.=A0 It also stifles discussion to depend solely on the
>archives, no matter how well filled they are.<br><br>
>Jim Shields, PhD<br>
>Retired Biochemist<br><br>
><br>
>At 10:58 PM 8/29/2004 -0400, you wrote:<br>
><blockquote type=cite class=cite cite>There is at least one alternat=ive
>to destroying a plant affected with<br>
>Arisaema rust. (I believe I mentioned this several years ago either on
>this<br>
>list or on Aroid-L)<br><br>
>The rust is native to my area on local Arisaema triphyllums.=A0 I
>planted an<br>
>A. sikokianum tuber and it did well for several years and even set seed.=
>In<br>
>the third or fourth year the plant got a severe case of the rust. I<br>
>consulted with Judy Glattstein who is a friend of ours with much
>experience<br>
>growing Arisaemas and she told me (as I recall) that the rust is only in=
>the<br>
>above ground portion of the plant and the tuber is not affected.
>She<br>
>recommended that I behead the plant (i.e. cut it off at ground level) an=d
>it<br>
>would likely survive and come back rust free the next year. This was
>in<br>
>June, early summer, long before the plant would normally go
>dormant.=A0 I took<br>
>a deep breath and did as she suggested. It worked! The plant came up
>the<br>
>next year and bloomed (I didn't check it's sex) and lived on for another=
>few<br>
>years and never had the rust again.=A0 I believe the local outbreak of
>rust in<br>
>A. triphyllums had declined as I haven't had and cases in the garden on
>A.<br>
>triphyllum for over ten years either.<br><br>
>The only species I have had the rust on are A. triphyllum and A.
>sikokianum.<br><br>
>So, if you live in an area with the Arisaema rust present in local<br>
>populations, and thus spores in the air I would recommend you try
>the<br>
>beheading procedure.=A0 However, if you live where the rust is unknown
>(no<br>
>local Arisaema triphyllum populations) and you have a case in your
>garden<br>
>you should probably destroy the infected plants immediately.<br><br>
><br>
>Mike Slater, Southeastern Pennsylvania, USA, z6 </blockquote>
><x-sigsep><p></x-sigsep>
>*************************************************<br>
>Jim
>Shields<x-tab>=A0=A0=A0=A0=A0</x-tab><x-tab>=A0=A0=A0=A0=A0=A0=A0=A0</x-=tab>USDA
>Zone
>5<x-tab>=A0=A0=A0=A0=A0</x-tab><x-tab>=A0=A0=A0=A0=A0=A0=A0=A0</x-tab>Sh=ields
>Gardens, Ltd. <br>
>P.O. Box
>92<x-tab>=A0=A0=A0=A0=A0</x-tab><x-tab>=A0=A0=A0=A0=A0=A0=A0=A0</x-tab>
>WWW:=A0=A0=A0
><a href="http://www.shieldsgardens.com/" eudora="autourl">http://www=.shieldsgardens.com/</a>
><br>
>Westfield, Indiana 46074, USA<x-tab>=A0=A0=A0</x-tab><x-tab>=A0=A0=A0=A0==A0=A0=A0=A0</x-tab><x-tab>=A0=A0=A0=A0=A0=A0=A0=A0</x-tab><br>
>Tel. ++1-317-867-3344=A0=A0=A0=A0 or=A0=A0=A0=A0=A0
>toll-free 1-866-449-3344 in USA<br>
></html>

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