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Agricultural crops :: Cash crops :: Cotton

Root rot: Rhizoctonia bataticola (Pycnidial stage: Macrophomina phaseolina)

Symptom

  • Germinating seedling shows black lesions on hypocotyls, girdling of stem and death of seedlings.
  • Affected basal stem becomes dark with bark shredding and scloretial bodies in the shredded bark.
  • The entire root system gets rotted, plants dried & can be easily pulled out.
Management
  • Treat the seeds with Trichoderma viride @ 4g/kg or Pseudomonas fluorescens
    @ 10g/kg of seed.
  • Treat the seeds with Carboxin or Thiram at 5 g or Carbendazim at 2g/kg.
  • Spot drench with 0.1% Carbendazim or 0.05% Benomyl.
  • Apply farm yard manure at 10t/ha or neem cake at 2.5t/ha.
  • Adjust the sowing time, early sowing (First week of April) or late sowing (Last week of June) so that crop escapes the high soil temperature conditions.
  • Adopt intercropping with sorghum or moth bean (Phaseolus aconitifolius) to lower the soil temperature. 

Root rot Bark shredding


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