Hi everyone,
I recently planted a Tropic Sweet and Golden Dorsett apple tree about 2 months ago, and have new growth. However, the trees have been thinning quite a bit. I’m very unfamiliar with plant diseases. Can someone help me out? This is what they look like before they fall off.
I get that to.
I could be this relative new apple leaf diseas, Marrsonina Leaf Blotch.
Much appreciated. I’m in North Florida if that’s of any help.
I spray with a mix of Captan and Myclobutanil. A brand called Immunox is easy to find at Lowe and Home Depot.
Spray twice in the summer. Unfortunately, it has rained so much this year in my area, the effectiveness has been less. Captan is washed off by the rain easily. Myclo stays longer but the mix is better than one product. I may spray one more time butI need to be careful because there is 14 days pre harvest interval of myclobutanil. Can’t eat any apples sprayed with it with 14 days of spray.
Solid advise 
Thank you!
I get that too. My biggest apple has defoliated '20 and '21 and loosing leaves now. I plan to spray it early next year with Immunox as well. I severely pruned it back last fall and it looked good until a few weeks ago.
Don’t know the variety. I ordered a plum and got an apple instead, about 19 years ago. Great tasting, large red apples. It’s why I haven’t offer to share scions from my apple trees.
The early fungicide spray in the spring will take care of cedar apple rush, scab, sooty blotch and fly specks, etc.
For Marrsonina Leaf Blotch, @alan suggested spray in the summer.
Is it too late in the summer to spray with immunox? The tree already has lost a lot of leaves so it would seem better to spray next year early in the summer. It would be hard to get a decent spray on the upper canopy
Where are you in zone 6.
If your tree has defoliated a lot already, I would skip spraying this year. What I did was raking up those infected leaves as much as possible. It is a part of orchard sanitation.
I am in NE Ohio. So Zone 6A. I bag the leaves every time I mow.
Marssonia defoliated an apple tree in 2021. Next year sprayed Captan in August and Sulfur in September. Trees were ok.
Hope this helps some
Welcome aboard! I’m in South Georgia; and if your rain has been anything like ours{ very,very high} foliar defects like that are all but certain. I’m seeing it here in just a few spots per leaf; or more commonly; attacking the leaf tips sort of like fireblight. But if you look both types show the splotchy patches too.
Usually when we get Fireblight; it takes a whole shoot.
