Tree disease

Asked July 23, 2017, 5:15 PM EDT

Two of my trees have issues. Looking for recommendations. Tree 1 is Cleveland pear. Leaves get orange brown spots and then dying off. Tree 2 is unknown but also getting spotted and dying. Photos of leaves from both trees attached. Thanks for any help.

Wayne County Michigan trees and shrubs pear trees

3 Responses

Hello,

The pear has a rust disease, probably European pear rust, also known as Trellis rust. The wet spring is when it begins, and we have had many reports this year. Here is info for homeowners---

http://www.ladybug.uconn.edu/FactSheets/pear-trellis-rust.php

The following articles have good information, and were written for tree care professionals, so they mention specific products- however this is not an endorsement by MSU or by Ask-an-Expert of these products or companies--

https://treedoctor.msu.edu/sites/default/files/docs/Aug16_TrellisMgmtUpdate.pdf

And, this update--

https://treedoctor.msu.edu/sites/default/files/docs/Sept15_TrellisRustUpdate.pdf

The second picture shows leaves partly crumbled away. Would you please attach another picture of 2-3 leaves that are whole, flattened out, and at least one that is still partly green. A picture of the overall tree or a close up of the branch showing the bark and how 3-4 leaves attach to it would be helpful.

If you would like a professional service to treat trees you can find them by searching here --- www.treesaregood.org

I will watch for your new pictures and try to help you with the second tree.

Thank you for using our service.


Hello again,

Thank you for the pictures. You have an ornamental crabapple tree. Crabapples this year have been hit very hard with apple scab disease. This happens every year to varying degrees. Even resistant varieties of crabapple trees have been affected this past spring. This is what you can do now:

Keep the fallen leaves raked up and discarded.

Keep the tree watered during times of drought.

Check and Redirect your sprinklers so that they do not hit the leaves and branches.

The tree may develop some new leaves this summer, but not many.


Here are a couple articles on how to manage the disease next year. If a fungicide is applied at the correct time, early next spring, and repeated as these article direct, you will prevent apple scab on the vast majority of the leaves next year.

https://www.extension.umn.edu/garden/yard-garden/trees-shrubs/managing-apple-scab/

http://msue.anr.msu.edu/news/crabapples_can_be_a_star_in_your_landscape

Thanks for using Ask an Expert.