It could be Marssonina leaf blotch, which has been appearing in orchards this time of year – we first identified this in Pennsylvania last September and I’m aware of incidences in NY, NJ, and CT. It’s rearing its head again this season, most likely due to the feet of rain we have received since July. I recently wrote an article for PSU’s Fruit Times:
https://extension.psu.edu/2018-disease-update-marssonina-blotch-on-apple-trees Moral of the story: treat it like you would deal with apple scab. Sanitation will be key keeping this disease in check year to year. Kari Peter, Ph.D. Assistant Research Professor - Tree Fruit Pathology Department of Plant Pathology and Environmental Microbiology Penn State Fruit Research and Extension Center 290 University Dr., P.O. Box 330 Biglerville, PA 17307-0330 Office: 717-677-6116 Ext. 223 Fax: 717-677-4112 E-mail: ka...@psu.edu<https://webmail.psu.edu/webmail/shell.cgi?timestamp=1362517824> Twitter: https://twitter.com/drtreefruit From: apple-crop-boun...@virtualorchard.com <apple-crop-boun...@virtualorchard.com> On Behalf Of maurice tougas Sent: Tuesday, October 09, 2018 12:36 PM To: Apple-Crop discussion list <apple-crop@virtualorchard.com> Subject: Re: [apple-crop-2] Apple leaf disorder Yup seeing same here. No captan or phosphorous . Goldens but I don't recall seeing on Jonagold. Ill check. Mo Tougas On Tue, Oct 9, 2018 at 12:26 PM David Kollas <kollasorchar...@gmail.com<mailto:kollasorchar...@gmail.com>> wrote: The photo below, taken yesterday in my orchard, shows a Jonagold tree among other Jonagold trees that are dropping leaves. Severity varies from few to many leaves showing the spots and leaf-drop on different trees. Similar, but less severe symptoms appear in other varieties that have yellow delicious in their heritage. I suspect it to be a fungal infection, because the spots appear on green leaves, which then turn yellow and drop. Frequent captan plus phosphorous acid sprays have been applied for sooty blotch in recent weeks because of frequent rains and and infrequent appearances of the sun. I have seen similar, but less severe occurrences of the disorder in other years, but would like to hear whether others are seeing it this year, or have knowledge of the causes and prevention. David Kollas Kollas Orchard Connecticut, USA [cid:EA50C707-49A2-4BBA-AC36-0B822B1841AC@hsd1.ct.comcast.net] _______________________________________________ apple-crop mailing list apple-crop@virtualorchard.com<mailto:apple-crop@virtualorchard.com> http://virtualorchard.net/mailman/listinfo/apple-crop -- Maurice Tougas Tougas Family Farm Northborough,MA 01532 508-450-0844
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