North American Fruit Explorers mailing list at ibiblio

["loneroc" <loneroc@mwt.net>]

I have similar levels of infection on certain trees here in SW Wisconsin (a
lesion or two on each leave on a good proportion of leaves) and notice no
problems.  I get no defoliation from CAR so I don't worry.  I never treat
for it.  If you look at spray recommendations, CAR is not touched by Captan
for example.  You have to go for Maneb (scary--read the label) or one of the
expensive systemics (Polyram).

CAR seems to be the biggest problem in certain parts of the mid-South but
I'm sure folks there will weigh in on that.  I don't know of an organic
control.  Michael Phillips says sulfur, but whether that would work under
high disease pressure.

Steve Herje, SWWI


----- Original Message ----- 
From: "Ginda Fisher" <list@ginda.us>
To: "NAFEX" <nafex@lists.ibiblio.org>
Sent: Friday, August 12, 2005 5:59 AM
Subject: [NAFEX] Cedar Apple Rust


> How serious a problem is cedar apple rust?  I have a few young apple
> trees, and I noticed that several of the leaves of all but one of
> them have a CAR lesion.  Between deer and winter moths, these trees
> have more serious problems (I think) but they don't have many leaves
> in total, so "several" means maybe 1 leaf in 5, or one in 10.
>
> How serious a burden to the tree is this level of infection?  Please
> don't reply with a list of CAR-resistant trees.  My question is about
> how important it is for me to treat these ones.  (If I only grew
> apples resistant to everything, I'd have very little choice, and most
> if it could be purchased at my local seasonal fruit stand.)
>
> This year seems like it might be better than last, I think the
> Jonathan last year had infections on at least a quarter of its
> leaves, and this year it can't be more than 1 in 8.  (Most of the
> others are new since last year.)
>
> Thanks,
> Ginda Fisher
> eastern MA, zone 6
>
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