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Horticultural crops :: Vegetables:: Radish

Alternaria Blight: Alternaria raphani

Symptoms

  • The pathogen affects leaves, stem, pods and seeds.
  • Symptoms of the disease first appear on the leaves of seed stem in the form of small, yellowish, slightly raised lesions.
  • Lesions appear later on the stems and seed pods.
  • Infection spreads rapidly during rainy weather, and the entire pod may be so infected that the styler end becomes black and shrivelled.
  • The fungus penetrates in pod tissues, ultimately infecting the seeds. The infected seed fails to germinate.

Management

  • Spraying with Mancozeb 0.25 %

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