Did you know that wet conditions fuel the spread of foliar diseases and pose a serious challenge to tree health? It’s why our certified arborists at American Tree Experts continue to prioritize protection against tree infections.
Apple scab is one of the most common and damaging diseases affecting trees.
“Apple scab persists in fallen foliage, leading to annual reinfection and cumulative harm to susceptible trees,” explains Dean Ziemienski, Vice-President of American Tree Experts. “Removing infected leaves is crucial to reducing next year’s disease.”
Apple scab typically affects ornamental and fruit trees in the rose family. Look for small, circular brown lesions on upper leaf surfaces; these can expand and cause defoliation. If conditions worsen, fungicide applications are recommended, particularly in spring when spores are prevalent.
Additional tree diseases to watch for:
- Rust – Impacts junipers and hardwood trees, like hawthorn and crabapples. This disease involves a complex life cycle where two different host species are needed to cause infection. The effect is mostly cosmetic, but rust will diminish a tree’s appearance.
- Leaf Spot – Exhibits distinctive brown spots or lesions in various dark colors (brown, black, tan, or red) and red or purple borders on leaves. Ash, maple, white oak, sycamore, and walnut are most susceptible, causing partial to complete defoliation.
- Needle Cast – Primarily includes dothistroma and diplodia (Austrian pines) and rhizosphaera needle cast (white and blue spruce). Look for needle loss on lower branches that move upward as the disease advances. Needles will turn from green to brown, sometimes appearing black and sooty. Grows in damp conditions and can spread to healthy trees.
It takes proper care to maintain the overall health and well-being of your trees. ATE’s Plant Health Care (PHC) Program involves a routine maintenance check to curb issues on your property and more.
Are you noticing signs of damage on your trees? Our certified arborists can diagnose and recommend treatment. Reach out to us for a consultation.
