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OMAFRA: Anthracnose of garlic scapes confirmed in Ontario

October 26, 2022  By Fruit & Vegetable

Katie Goldenhar, horticulture pathologist with the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA), has reported the first confirmed case of of anthracnose of garlic scapes in Ontario. The disease is caused by the fungal pathogen Colletotrichum fioriniae, which has a wide host range.

Anthracnose of garlic has been reported to infect only garlic scapes and bulbils. The disease has been observed in multiple northern U.S. states, including New York, Maryland and Indiana; in early summer 2022, orange, sunken lesions were seen on garlic scapes in Ontario.

Temperatures from 25 to 30 C are optimal for disease development. Sporulation is triggered when at least 12 hours of leaf wetness have occurred. Spores are moved by splashing during rain or irrigation; spores can also be moved by people or equipment, and wind to a lesser extent.


C. fioriniae can overwinter as mycelium on infected plants. Bulbils can be infected and result in the spread of disease, and overwintered mycelium can infect scapes the following spring. |READ MORE

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