Q: Can you tell me what is wrong with my crab apple tree, and what I should do about it? The leaves started turning yellow earlier this summer and now there are hardly any leaves left. It looks awful.

There have been reports that 2024 has been a bad year for apple scab in both fresh-eating apples and crab apples. Apple scab infections on fruit start off olive-green and turn into a rough, cork-like ...

Apple scab is one of the most common apple and crabapple diseases that gardeners have to deal with. Apple scab is caused by the fungus Venturia inaequalis. It will attack any varieties of crabapple ...

This has been one of the worst years for disease that I can remember as a gardener. Both here at the Garden and throughout the Chicago area, I have noticed many crabapples as well as serviceberries ...

There are hundreds of choices when picking a crabapple tree from the nursery, but a Purdue University expert says only a handful are resistant to a widespread fungus or other serious diseases. After ...

Q: I have a white flowering crab that we’ve had for about 20 years. Can you tell me what could possibly be wrong that’s causing the leaf problems, and is there anything I can do? — Christine W. A: We ...

The wet weather and humidity has led to a very noticeable outbreak of apple scab, a fungal disease, on apple and crabapple trees in the area. Apple scab can result in severe defoliation on apple and ...

Q:Is it better to leave the leaves under an apple tree to create a winter mulch, or is it better to rake them up and compost them? A: It is a good idea to use a mulch under deciduous fruit trees, and ...

Q. The apples on our Prairie Magic tree have round black spots. At first I thought it was bruising from hail but it's also near the bottom of some fruit, where hail couldn't hit. What is this damage ...

More people than ever are gardening during the pandemic and you’re bound to have questions. Turn to Ask an Expert, an online question-and-answer tool from Oregon State University’s Extension Service.