Tree Diseases: Downy Mildew (Peronospora and Plasmopara)
Introduction Downy mildew is a plant disease that affects a bevy of economic and ornamental plants. Unlike powdery mildew, which is a true fungus, downy mildew infections are caused by…
Physiological Disorders of Trees: Blossom End Rot
Introduction Blossom end rot is a common physiological disorder of several important fruits and vegetables. It can often be observed in commercial nurseries and home gardens. Blossom end rot is…
Tree Diseases: Butternut Canker (Sirococcus clavigignenti-juglandacearum)
Introduction Butternut canker is a fungal disease that attacks Juglans cinerea, also known as butternut or white walnut. The disease is caused by the pathogen, Sirococcus clavigignenti-juglandacearum. S. clavigignenti-juglandacearum is…
Fall Tree Care: Identifying Common Tree Diseases in Fall, Part 5
This is the fifth part of a series on fall tree diseases and disorders. This article examines black rot of apple and dothistroma needle blight. Introduction During fall, the environment…
Fall Tree Care: Identifying Common Tree Diseases in Fall, Part 4
This is the fourth part of a series on fall tree diseases and disorders. This article examines bacterial wetwood and black knot. Introduction During fall, the environment undergoes a drastic…
Fall Tree Care: Identifying Common Tree Diseases in Fall, Part 3
This is the third part of a series on fall tree diseases and disorders. This article examines bacterial leaf scorch and bacterial leaf spot. Introduction During fall, the environment undergoes…
Fall Tree Care: Identifying Common Tree Diseases in Fall, Part 2
This is the second part of a series on fall tree diseases and disorders. This article examines armillaria root rot and apple scab. Introduction During fall, the environment undergoes a…
Fall Tree Care: Identifying Common Tree Diseases in Fall, Part 1
This is the first part of a series on fall tree diseases and disorders. This article examines annosum root rot and anthracnose. Introduction During fall, the environment undergoes a drastic…
Tree Diseases: Thousand Cankers Disease (Geosmithia morbida)
Introduction Thousand cankers disease (Geosmithia morbida) is a disease complex that affects walnut trees. The complex begins with the infestation of vulnerable walnut trees by the walnut twig beetle, Pityophthorus…
Insect Profiles: Peachtree Borer (Synanthedon exitiosa)
Introduction Peachtree borer (Synanthedon exitiosa) , also called peach crown borer, is the most destructive pest of cherry, peach, plum, and other stone fruits. The insect damages trees during its…