Mainly, I am concerned about a apple tree (pictured) and a crab apple tree on...

Asked July 16, 2014, 4:07 PM EDT

Mainly, I am concerned about a apple tree (pictured) and a crab apple tree on my property. They have brown spots on the fruit and leaves and leaves are turning brown and falling off. Can you help me identify this disease and products and resources for treating the infected trees. Also, I have a few other trees, I believe the one pictured is an Ash? They have similar spots but are brown/yellow in nature.

Dakota County Minnesota

1 Response

You are seeing signs of apple scab. Apple scab seems to be rampant this year, thanks to our monsoon weather. As with most fungal diseases, the best treatment is good sanitation. There are also varieties that have better resistance. If scab continues to be an issue with your tree in future years, you can consider a fungal spraying program. It is too late to spray for scab this year. Please read here about apple scab:
http://www.extension.umn.edu/garden/yard-garden/fruit/apple-pest-management/apple-scab/

I don't see the ash you mentioned, but Mountain Ash (not a true ash) is also susceptible to apple scab:
http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/managing-apple-scab/