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Horticultural crops :: Vegetables:: Musk melon and Water melon

Alternaria Blight: Alternaria cucumerina

Symptoms

  • It usually occurs on foliage during the middle of the growing season.
  • The disease starts as small, yellow spots which enlarge to form concentric rings on the upper leaf surfaces.
  • Muskmelons are more susceptible than other cucurbits to Alternaria blight. Often muskmelon vines will be almost completely defoliated by this disease.
  • The pathoegen also may cause fruit injury.
  • Alternaria cucumerina may be carried in and on seed and can also overwinter in diseased plant debris or cucurbit weeds.
  • Spores produced on infected foliage are spread by wind, rain, people, tools, etc.
  • Plants weakened by lack of proper fertilizer or poor soils are more likely to be attacked than young, vigorously growing plants.
  • Warm, wet weather favors development of Alternaria blight.

Management

  • To control Alternaria blight, plant disease-free seed in fertile, well-drained soil, practice crop rotation with unrelated crops, destroy cucurbit weeds.
  • Spray the crop with Mancozeb @ 2 g /lit.

 


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