“Conditions have been favourable for infection by Didymella bryoniae, the causative agent of Gummy Stem Blight. Look for hot spots of stems with oozing lesions, and for distinctive patterns on the skin of butternut squash.”
“Powdery mildew pressure remains high. Infection with powdery mildew can reduce fruit quality including poor internal colour development, and infection of the petiole (Figure 5) can reduce marketability.”
Characteristic concentric lesions caused by Didymella bryoniae on butternut squash. Ridgetown ON, 2 Sept. photo by OnVegetables
