AUTHORS: Zhendong Zhu and Weidong Chen
SYMPTOMS
• Symptoms occur on all above-ground plant parts
• Leaf lesions are water-soaked, grayish, irregular or circular lesions, with a concentric ring pattern
• Stem lesions are initially fuzzy, gray lesions, later turn tan and girdle stem
• Pod lesions are initially irregular or circular, water-soaked, later turn tan and sunken
• Gray, fluffy mycelium are produced on lesions under conditions of high humidity
FIGURE 1 – Circular lesion with a concentric ring pattern on leaf
FIGURE 2 – Tan lesions covered with grayish mycelium on tendrils
FIGURE 3 – Tan lesions girdling stem
FIGURE 4 – Tan, sunken lesions covered with grayish mycelium on pods
FACTORS FAVORING DEVELOPMENT
• Cool and high humidity conditions
IMPORTANT FACTS
• Pathogen can survive in soil and plant debris or on growing plants
• Pathogen can be dispersed by splashing water, wind, or farm machinery
• Pathogen infests many plant species
• Resistant cultivars are not available
• Foliar fungicides can help manage disease