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Agricultural crops :: Oilseeds :: Groundnut

Alternaria leaf disease: Alternaria arachidis and A. tenuissima

Symptom
  • Lesions produced by A. arachidis are brown in colour and irregular in shape surrounded by yellowish halos.
  • Symptoms produced by A. tenuissima are characterized by blighting of apical portions of leaflets which turn light to dark brown colour.
  • In the later stages of infection, blighted leaves curl inward and become brittle.
  • Lesions produced by A. alternata are small, chlorotic, water soaked, that spread over the surface of the leaf.
  • The lesions become necrotic and brown and are round to irregular in shape.
  • Veins and veinlets adjacent to the lesions become necrotic. Lesions increase in area and their central portions become pale, rapidly dry out, and disintegrate.
  • Affected leaves show chlorosis and in severe attacks become prematurely senescent.
  • Lesions can coalesce, give the leaf a ragged and blighted appearance.

Management

  • Foliar application of Mancozeb (0.3%) or Copper oxychloride (0.3%) or Carbendazim(0.1%)



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