identify/treatment for orange/yellow spots

Asked June 6, 2018, 10:01 AM EDT

Hi. I apple trees that have developed orange/yellow spots. Can you identify what is the cause and how to treat it? Thanks,

Montgomery County Maryland

1 Response

Apples are very susceptible to pest and disease problems and eventually require a spray schedule for control. Based on your photo you are dealing with a rust disease.
See our publication on pome fruit for more information and our website for growing information as well as spray schedules. Look at the spray schedule from Va Tech on rust and you will have to spray based on the disease and timing of application.