Why do ornamental crabs have spots on the leaves? When is the best time to spray crabs, with what and how often?
Most ornamental crabs in our area are susceptible to a fungus called Apple Scab or Rust. This is what causes the black or brown spotting on the leaves. It is best to spray crabs every year with a systemic fungicide in the early Spring, with the first application at the pink bud stage. Two more applications are necessary at three week intervals. This will definitely improve and preserve the looks of the crab throughout the year. You can purchase fungicide at any local hardware or home improvement store. I have insects in the trees/shrubs/ ornamentals at my job site, what do I do? Deerpath Nurseries can help diagnose pest problems on any plants purchased from our nursery and will refer you to companies who specialize in pest management.
