Symptoms and Management of Purple blotch of Onion and Garlic

Alternaria blight, Purple blotch of Onion and Garlic

Symptoms and Management Alternaria blight/Leaf blotch/Purple blotch of Onion and Garlic Causal organism: Alternaria Porri . Origin The disease was first reported by Ajrekar from Bombay in 1921. Symptoms of Purple Blotch of Onion and Garlic 1. Symptoms first appear on leaves or seed stalks as small water-soaked lesions that quickly develop white centers. 2. Under favourable condition, these lesions enlarge, coalesce, become zonate and brown to purple that extend upward and downward. 3. In moist weather, the surface of the lesion, may be covered with black fruiting bodies of fungus. 4. The older leaves are more susceptible than younger leaves and younger leaves relatively more susceptible when they emerge close to bulb maturity. 5. Similar lesion may form on seed stalk, as a results seed either do not develop or are shriveled. The infected plants fail to develop bulbs. 6. Severely infected foliage of onion and garlic may exhibit dieback. 7. The bulb can also be affected at harvest when the fungus enters through the neck or injurious, causing storage rot. …

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List of microorganisms and their uses

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List of soil borne pathogens

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