DiseasesPlant disease is defined as any physiological abnormality or significant disruption in the “normal” health of a plant. Diseases generally result from the continuous irritation by a pathogenic agent or environmental factor, which leads to the development of “symptom.” Thus, disease can be caused by living (biotic) agents, including fungi, bacteria, nematode, phytoplasma, virus and viroids or by environmental (abiotic) factors such as nutrient deficiency, drought, lack of oxygen, excessive temperature, ultraviolet radiation or pollution.
Plant disease can cause significant economic losses to yield, quality and aesthetic values in a production system. For that reason, plant diseases should be diagnosed as quickly as possible in order for the grower to take corrective measures (disease management or control tactics) to minimize losses on existing plants or future planting.
Fact sheets on common plant diseases:
- Downy Mildew
- Disease Diagnosis And Management
- Early Blight of Tomatoes
- Late Blight of Tomatoes
- Septoria Leaf Spot
- Tree Fruits
Fire Blight on Pome Fruit
Nutrient Defficiencies in Plants
Rhizophaera Needle Cast of Spruce
Preventing Winter Damage on Evergreens and Landscape Trees
- WVU Plant Diagnostic Clinic
- Disease Identification Guide (PDF) – Updated in 2009, this guide covers plant diseases common to West Virginia agricultural and ornamental crops.
Disease Identification Service
WVU Extension provides *disease identification service.You can download the WVU Plant Diagnostic Clinic Form (PDF) to submit a disease related sample for identification.