Bacterial leafspot—Pseudomonas syringae
pv. maculicola
Infections of bacterial leafspot start as small, dark specks on leaves. As the disease develops, numerous
water-soaked leafspots appear. Leafspots remain small (0.125 inch in diameter). Older leafspots turn tan
and may or may not have a purple border around them. Leafspots are visible from both the top and bottom
sides of leaves.
Solutions
Bacterial leafspot occurs primarily in cooler regions such as the Pacific Northwest and in coastal areas.
The pathogen that causes the disease is seedborne and is splashed from plant to plant by rain and sprinkler
irrigation. Plant clean seed and disease-free transplants. Avoid sprinkler irrigation. Remove and discard
of any diseased plants.
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Bacterial
leafspot on cauliflower
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