Hello, Rye -- Strep does NOT move systemically in plants. It may be absorbed into surface cells, but so far as I know it won't be taken up through roots. If there was an easy way to control blight, someone would have found it by now: we've only been studying it for several centuries. Black on the bark may be dead cells killed by sunburn or by fungi invading heat-injured and/or desiccated cells. So long as you have live bark underneath, it probably doesn't matter much. If it is on the lower part of the tree, you can protect trees from sunburn by applying a white latex paint.
On Feb 13, 2013, at 8:30 PM, Rye Hefley <ducn...@yahoo.com<mailto:ducn...@yahoo.com>> wrote: Hi Apple gurus, Answers don't jump out at me feom google. I'm curious why we don't put agri-mycin in the irrigation water to treat from the inside out? (As in we administer antibiotics to humans through the stomach for 10 days.) Why is spray the appropriate delivery? I'm not growing fruit this year (renoving flowers). I'm not concerned about fruit saturation/consumption. I have pruned fireblight cankers what I can but I'm sure I didn't get it all nor did I pick up every last leaf particle. Just grasping for a way to innoculate from the inside. Every pruning cut showed healthy wood inside but some trees have black splotches on the outer bark almost always on the south sid of the tree. I even scraped some of the black from pruned wood and the inner wood is very healthy looking immediately under the bark. I have a fantasy that that is sunburn here un sunny So Cal. Not realistically hopeful of that. Thanks, Rye Hefley So Cal _______________________________________________ apple-crop mailing list apple-crop@virtualorchard.net<mailto:apple-crop@virtualorchard.net> http://virtualorchard.net/mailman/listinfo/apple-crop ************************************************************** Dave Rosenberger, Professor of Plant Pathology Cornell University's Hudson Valley Lab P.O. Box 727, Highland, NY 12528 Office: 845-691-7231 Fax: 845-691-2719 Cell: 845-594-3060 http://www.nysaes.cornell.edu/pp/faculty/rosenberger/
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