Apple scab is a fungal disease caused by the fungus Venturia inaequalis, which affects leaves, fruit and twigs. While most common in apple trees, both pear and hawthorn are also frequently infected by the fungus. Outbreaks will be most severe following particularly wet and cool spring conditions.
The fungus overwinters on fallen leaves and begins to develop spores in the spring prior to bud break. The spores are then transported by wind, rain or other physical means to infect tender, developing leaves, twigs and fruit. Once the fungal infection is established in the newly forming tissues, more spores are produced and spread to other areas of the tree.
Infection is commonly evidenced first by brownish-green spots on the leaves or fruit. As the infection progresses, the spots on the fruit become darker and more prominent and take on a somewhat fuzzy texture. When infection is severe, leaves will turn yellow and drop off. Fruit will become deformed and/or drop off prior to ripening.
Info Source: Arborjet
Trees will recover from infestation and will be protected from this disease after the application of effective treatments offered by Joe’s Tree Care. We have certified arborists that can help you keep your trees healthy! Call us today! 512-215-1551