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.

It is nearly time to begin spraying crab apples that are susceptible to apple scab (typically this disease affects older varieties of crab apples). If your tree's leaves become covered with black ...

Some crabapples are very susceptible to apple scab, and those not treated in spring may have lost many of their leaves. Their remaining leaves can be affected with black and yellow spots. Spraying at ...