Downy Mildew

The downy mildews are a group of fungal diseases that cause destruction of the leaves, stems, flowers and fruits of many plants, including grapes, cucumbers and roses. Learn symptoms and controls in this factsheet.

Guignardia Leaf Spot

Guignardia leaf spot is a fungal leaf spot that affects vining plants such as Boston ivy and Virginia-creeper, and is associated with a leaf spot and fruit rot of grape called black rot. Learn more here.

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