Sudden Death of Apple Trees

Identification

• Apple trees are susceptible to phytophthora root and crown rot caused by the Phytophthora fungi. The disease is prevalent in trees growing in poorly drained soil. Infected trees wilt and die rapidly within a single growing season. Symptoms accelerate in warm weather.

Damage

• Disease is characterized by foliage discoloration. Leaves start to yellow with red or purplish shades. Initially the symptoms are concentrated in certain areas. Disease gradually spreads throughout the tree. Bark starts to display dark, oozing areas. Inspection of inner bark reveals brown streaks.

Management

• Plant trees in a well-drained soil and avoid overwatering. Obtain healthy trees from reliable sources to minimize risk of infection.