Biological Management of Purple Blotch in Onion/Garlic - BigHaat
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A "blotch" is a word that describes a large irregular mark; in this case the blotch occurs on the leaves. Onion Purple blotch is a common disease, especially in hot humid countries. It is said to be the most common disease of onion . It occurs throughout the year, but damage is greater during the drier season when heavy dews occur. Losses are more than 40% , and are reported to be higher.