Hi Dave, That is worse than I thought. I think I'll recommend something else.
Thanks for the advice, Lorraine ________________________________ From: apple-crop-boun...@virtualorchard.net [mailto:apple-crop-boun...@virtualorchard.net] On Behalf Of Dave Rosenberger Sent: Tuesday, July 19, 2011 5:13 PM To: apple-crop@virtualorchard.net Subject: {SPAM?} Re: [apple-crop] Abound usage and apples Importance: Low Hi, Lorraine -- Gala, McIntosh, and anything with McIntosh background are cultivars that can be severely damaged by azoxystrobin. That is the simple answer. The degree of damage depends on a variety of factors including azoxystrobin concentration, time of year that the application is made, etc. The reason for the label restriction requiring separate sprayers is that azoxystrobin will burn susceptible apples even if the concentration of azoxystrobin is in the parts per billion range. Thus, it is almost impossible to assure that a sprayer is really "perfectly cleaned" and will have no azoxystrobin residues after it has been used to apply azosystrobin. You probably can get away with using the same sprayer after a thorough cleaning, but the company is saying that they won't buy your apple crop if you ruin it because your sprayer was not as clean as you thought it was. In the early days after azoxystrobin was released, ICI (who developed the product) ended up buying a lot of apples along Lake Erie because grape growers a mile away from the affected apple orchard applied azoxystrobin at night with an Agtec or Kinkelder sprayer (i.e., with low-volume sprayers that used highly concentrated azoxystrobin) during a time when there were inversions over the vineyards. That experience taught all involved that azoxystrobin drift in the form of non-visible spray droplets was still enough to totally ruin an apple crop. Given the label warnings on today's azoxystrobin packages and the variety-specific nature of azoxystrobin damage to apples, any off-site drift that damages a neighbor's apple crop can probably be traced to the guilty applicator and is likely to result in an expensive lawsuit. Thus, the key warning for anyone using azoxystrobin in apple producing regions is "BUYER BEWARE!!!" Hello everyone, A grower in Connecticut wants to use Abound (azoxystrobin), or Quilt Xcel (azoxystrobin plus propiconazole) for control of Boytryosphaeria on black currants. He has apples nearby and also uses the same sprayer for both crops. Both labels state that the products are extremely phytotoxic to certain apple varieties. What apple varieties are affected? If he uses Abound or Quilt Xcel, should he clean the sprayer with something special before he sprays the apples again? Any advice would be appreciated. Thanks, Lorraine Lorraine Los Fruit Crops IPM Coordinator Department of Plant Science and Landscape Architecture, U-4067 University of Connecticut Storrs, CT 06269-4067 (860)486-6449 (Phone) (860)486-0682 (Fax) lorraine....@uconn.edu Content-Type: text/plain; name="ATT00001.c" Content-Description: ATT00001.c Content-Disposition: attachment; filename="ATT00001.c"; size=224; creation-date="Tue, 19 Jul 2011 17:23:15 GMT"; modification-date="Tue, 19 Jul 2011 17:23:15 GMT" Attachment converted: davidrosenberger:ATT00001.c (TEXT/MSWD) (001EEC0D) -- ************************************************************** 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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