Hi Dave and all,
The Neudorff copper soap concentrate fungicide is registered in NYS and
this label has the OMRI logo on
it--http://oaspub.epa.gov/pestlabl/ppls.srchreslt?CompNum=067702&ProdNum=00002
It refers to July sprays on apples for anthracnose. It would be good to
get some efficacy data on copper soap, as the label rates uses low amounts
of actual copper.
Brian Caldwell
At 08:33 PM 5/13/2009, you wrote:
Thanks to all of you who responded to my query about copper. I
was actually looking for an OMRI approved product that specifically was
labeled for summer diseases on apples, or that at least allowed such
applications. Most coppers labeled for apples specify a green tip spray
for fire blight, blossom sprays for fire blight, and then "sprays before
fall rains" for anthracnose and other diseases. I suppose that a July
application could be construed as being "before fall rains," but our NY
regulators might not buy that. (Yes, it's true that NY regulators found
banking was too difficult to understand, but they still think that they
can understand and regulate pesticides more effectively than the US EPA!)
Anyway, my objective is to test a combination of a low rate of
Liquid Lime Sulfur (1 qt/100 gal of dilute spray) combined with a low
rate of copper to see if we can get reasonable control of both summer
fruit rots (mostly black rot, Botryosphaeria obtusa, in our area) and the
sooty blotch and flyspeck complex. I have tested the low rate of Liquid
Lime Sulfur (LLS) several times in previous years and it seems to work
quite well for flyspeck and sooty blotch. However, LLS did not control
fruit rots and at higher rates it may have even stimulated fruit rots,
perhaps by injuring cells that can then be invaded by Botryosphaeria.
I've tested the LLS/copper combination before using a
non-OMRI-approved copper and it did not cause any more harm to the fruit
that one might expect from copper sprays. However, we did not have good
disease pressure in that trial, so I'm hoping to repeat it this summer.
From: Yoder, Keith
Sent: Wed 2009-05-13 06:39
To: Apple-Crop
Subject: RE: Apple-Crop: copper fungicides for organic apples?
Dave,
Here is a possibility with summer labeling: Agri Star® Basic Copper 53
(Albaugh, Inc./Agri Star)
http://www.cdms.net/LDat/ld0BO001.pdf <http://www.cdms.net/LDat/ld0BO001.pdf>
It is registered for summer use on apples and is also listed with OMRI.
OMRI says: Basic Copper 53, Classification: "When used for plant disease
control must be used in a manner that minimizes accumulation of copper in
the soil. May be used as an algicide, insecticide, or disease control if
the requirements of 205.206(e) are met, which requires the use of
preventative, mechanical, physical, and other pest, weed, and disease
management practices".
The contact listed with OMRI is: Albaugh, Inc.: Mark Blume, Ph: 515-964-9444.
Summer diseases on the CDMS-posted Basic Copper 53 label include Brooks
spot, sooty blotch and bitter rot. The label warns about copper injury
and calls for different rates and different amounts of lime to be added
to the mix at different times of the season.
We tested a product with the same name and similar label wording but from
a different distributor in 1995. The reference for that report is
Fungicide and Nematicide Tests, Vol. 51:31-32 (1996). "Summer disease
control by copper formulations and fungicide mixtures on Nittany apple, 1995".
Our interest in testing this was for summer disease control on processing
apples, where russet isn't as much of a concern as for fresh market. We
used Basic Copper "53" 2 lb/A from greentip- petal fall, then Basic
Copper "53" 4 lb/A + Hydrated Lime 12 lb/A (first-fourth covers) followed
by Basic Copper "53" 4 lb/A + Hydrated Lime 8 lb/A (fifth and sixth
covers). Treatments were applied airblast to large trees at 100 gal/A.
That year we had one of the heaviest bitter rot tests we've ever had. We
got decent bitter rot control, better than a schedule involving Polyram
80DF 3 lb/A + Ziram 3 lb/A through second cover then Captan 50W 3 lb +
Ziram 76DF 3 lb/A, third to sixth covers. The copper schedule was weak on
flyspeck (which has been true with other coppers in other tests). In our
test, 19 wetting periods at 70 F or warmer occurred from mid-May to
mid-August contributed to the heavy summer disease pressure. Cumulative
wetting hours recorded starting 10 days after petal fall reached 250 on
26 Jun at the beginning of an 84-hr wetting period, then six inches of
rain and 142 more wetting hours between 22 and 30 June. We got a lot of
fruit russet from the full season copper schedule: only 7% of the fruit
made the USDA Extra Fancy / Fancy grades due to russetting.
I can send label and report files to anyone who requests them at my
e-mail address: ksyo...@vt.edu <mailto:ksyo...@vt.edu>
Keith
Keith S. Yoder, Research and Extension Tree Fruit Pathologist
Virginia Tech AREC, 595 Laurel Grove Rd., Winchester, VA 22602
Tel: 540-869-2560 Ext. 21
________________________________
From: apple-crop@virtualorchard.net on behalf of Dave Rosenberger
Sent: Tue 2009-05-12 22:30
To: apple-crop@virtualorchard.net
Subject: Apple-Crop: copper fungicides for organic apples?
Can anyone point me to a copper fungicide that is OMRI approved for
organic farmers AND that also has a US EPA label that allows repeated
applications to apples during summer. I know that I should be able
to find this info on the OMRI web-site, but I found that site
extremely confusing when I tried it a year or two ago.
--
**************************************************************
Dave Rosenberger
Professor of Plant Pathology Office: 845-691-7231
Cornell University's Hudson Valley Lab Fax: 845-691-2719
P.O. Box 727, Highland, NY 12528 Cell: 845-594-3060
http://www.nysaes.cornell.edu/pp/faculty/rosenberger/
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--
**************************************************************
Dave Rosenberger
Professor of Plant Pathology Office: 845-691-7231
Cornell University's Hudson Valley Lab Fax: 845-691-2719
P.O. Box 727, Highland, NY 12528 Cell: 845-594-3060
http://www.nysaes.cornell.edu/pp/faculty/rosenberger/
Brian Caldwell
Department of Crop and Soil Sciences
905 Bradfield Hall
Cornell University
Ithaca, NY 14853
ba...@cornell.edu
607-255-4747
Cell: 607-280-3652
Fax: 607-255-2644
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<http://www.virtualorchard.net> and managed by Win Cowgill and Jon
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Apple-Crop is not moderated. Therefore, the statements do not represent
"official" opinions and the Virtual Orchard takes no responsibility for
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