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Alternaria leaf disease: Alternaria arachidis and A. tenuissima

Groundnut
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%)
  • 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%)