Purple Blotch On Onions: Dealing With Purple Blotch In Onion Crops

By January 23, 2018Articles

Purple Blotch On Onions: Dealing With Purple Blotch In Onion Crops

By January 23, 2018Articles

Purple Blotch On Onions: Dealing With Purple Blotch In Onion Crops

By Amy Grant Have you ever seen purple blotches on your onions? This is actually a disease called ‘purple blotch.’ What is onion purple blotch? Is it a disease, pest infestation, or an environmental causal? The following article discusses purple blotch on onions, including what causes it and how to manage it. What is Onion Purple Blotch? Purple blotch in onion is caused by the fungus Alternaria porri. A fairly common disease of onions, it first manifests as small, water-soaked lesions that rapidly develop white centers. As the lesions progress, they turn from brown to purple with a halo of yellow. Often the lesions merge and girdle the leaf, resulting in tip dieback. Less commonly, the bulb becomes infected through the neck or from wounds. Fungal growth of spores of A. porri is fostered by temperatures of 43-93 F. (6-34 C.) with the most optimal temperature of 77 F. (25

Purple Blotch On Onions: Dealing With Purple Blotch In Onion Crops

By Amy Grant Have you ever seen purple blotches on your onions? This is actually a disease called ‘purple blotch.’ What is onion purple blotch? Is it a disease, pest infestation, or an environmental causal? The following article discusses purple blotch on onions, including what causes it and how to manage it. What is Onion Purple Blotch? Purple blotch in onion is caused by the fungus Alternaria porri. A fairly common disease of onions, it first manifests as small, water-soaked lesions that rapidly develop white centers. As the lesions progress, they turn from brown to purple with a halo of yellow. Often the lesions merge and girdle the leaf, resulting in tip dieback. Less commonly, the bulb becomes infected through the neck or from wounds. Fungal growth of spores of A. porri is fostered by temperatures of 43-93 F. (6-34 C.) with the most optimal temperature of 77 F. (25

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