Marssonina Leaf Blotch

[chickenlittle]

Wondering who has seen Marssonina Leaf Blotch and on what varieties? We’ve had a wet year here in NY. I see it on a bunch of my columnar trees. It’s not easy to tell from scab until the leaves turn yellow. I first noticed it in 2018 which was a wet summer. I haven’t been to my orchard in a month so I’m not sure what might be happening there in PA.

info and pictures can be found here.

Apple Disease - Marssonina Blotch

Marssonina blotch, caused by Marssonina caronaria, is a foliar disease first identified in Pennsylvania in September 2017.

extension.psu.edu

 

[Natureboy]

Some of the apple trees in my orchard have been hit hard by the Marssonina Leaf Blotch this year. I also first noted the problem in 2018 and have had problems every year since with some of the varieties being fully defoliated by August/September. I have tried to keep up with fungicide sprays with only limited success. I noted that both Freedom and Golden Delicious trees were nearly void of leaves when I last sprayed Sept. 2nd. I will try to take an inventory of the condition of my trees during my next visit.

 

[Native Hunter]

I checked the trees in my yard and found just an occasional leaf with this, but nothing even close to being a problem. I found some leaves on Freedom, Caney Fork LT, and Myers LT, but all three trees had good apple crops this year.