Fire blight?

Question: Old crab apple tree was beautiful this spring - so many bees you could hear the tree buzzing. Then after blossoms fell one limb turned yellow and the brown like it had been burned.  Quickly had limb removed however noticing more leaves turning yellow with green and brown spots and falling. Not the whole tree but several limbs.  Bark peeling and weird- dog uncovered small section near ground and wood looks red. What should I do next?

responder: An Ask Extension Expert Replied June 26, 2023, 11:49 AM EDT
response: Hello,   Based on what I see in your images:   (The links will tell you how to manage these problems)  The one limb that turned yellow and brown like it had been burned is fire blight. Go to these links: https://www.canr.msu.edu/resources/fire_blight  https://www.canr.msu.edu/news/fire_blight_reported_in_landscape_crabapples#:~:text=Fire%20blight%20is%20traditionally%20thought%20of%20as%20a,been%20confirmed%20by%20Michigan%20State%20University%20Diagnostic%20Services.  You notice more leaves turning yellow with green and brown spots and falling. This is apple scab - Please read these articles at these links: https://www.canr.msu.edu/ipm/uploads/files/WoodyLandscape_PDFs/AppleScab.pdf  https://www.canr.msu.edu/news/why_is_my_crabapple_tree_losing_leaves  https://www.canr.msu.edu/news/crabapples_can_be_a_star_in_your_landscape  The area where the bark is peeling and looks weird, where your dog uncovered a small section near the ground and wood looks red. It appears there is an old wound at the base of the trunk, and this may be the entry point of rot, which can cause the cambium to die in that section of the trunk. Other causes could be pruning branches too closely- cutting into the main trunk, insect damage, or cankers on the trunk.  IMPORTANT - Please get a confirmed diagnosis from the MSU Diagnostic Plant & Pest Lab - Please email your digital image of the area where the bark is peeling and looks weird, where your dog uncovered a small section near the ground and the wood looks red. Prior to bringing or sending physical samples. The image can be sent to <personal data hidden>.   MAKE SURE IN THAT E-MAIL YOU INCLUDE YOUR NAME, ADDRESS, AND PHONE NUMBER!!   Be prepared. The lab may ask for more images - THE LAB WILL LET YOU KNOW IF A SAMPLE NEEDS TO BE SENT - There is a $20-25 dollar fee (if they need a sample sent).   Lab email: <personal data hidden>  Lab phone:<personal data hidden>  Hours of operation: Monday through Friday, from 8:00 AM to 5:00 PM.   PLEASE READ BELOW ON PREPARING YOUR SAMPLE (if the lab needs a sample)   From the lab: Please do not ship samples on Fridays. Due to the current COVID-19 circumstances, please allow additional processing time. They thank you for your patience and understanding.   Every sample must be accompanied by a completed submission form. Please place the form in a separate resealable bag to prevent it from getting damp or soiled. The form is at this link: https://www.canr.msu.edu/pestid/uploads/files/General_Sample_Submission_Form_May2022.pdf.   Complete details of submitting a sample are at this link: https://www.canr.msu.edu/pestid/submit-samples/   I hope this helps!

responder: The Question Asker Replied June 26, 2023, 3:37 PM EDT
response: Thank you. Will be following up asap.On Jun 26, 2023, at 11:49 AM, Ask Extension <<personal data hidden>> wrote:﻿

responder: An Ask Extension Expert Replied June 26, 2023, 6:50 PM EDT
response: You are welcome! Have a great day!