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Soyabean Disease — Soybean D5

Soyabean

Charcoal rot, ashy or stem blight or dry root rot : Macrophomina phaseolina

Symptom
This disease occurs when the plants are under moisture stress or under nematode attack or through soil compaction or may be through nutrient deficiencies. It is a most common basal stem and root disease of the soybean plant. Lower leaves become chlorotic and wilting and drying is apparent. The diseased tissues generally develop grayish discolouration. The sclerotia look like black powdery mass hence the disease is known as charcoal rot. Blacking and cracking of roots is the most common symptom. The fungus survives in soil and crop debris in dry conditions. Dry conditions, relatively low soil moisture and nutrient and temperature ranging from 25o C to 35o C are favourable for the disease. Management Deep ploughing in summer. Ensure balanced fertilization of the crop. Rotate soybean with cereals. Maintain well drained field Destroy last years infected stubble. Seed treatment with T. viride @4g/kg or P. fluorescens @ 10g/ kg of seed or Carbendazim or Thiram 2g/kg of seed. Spot drenching with Carbendazim 1g/lit or P. fluorescens / T. viride 2.5 kg/ha with 50 kg FYM
  • This disease occurs when the plants are under moisture stress or under nematode attack or through soil compaction or may be through nutrient deficiencies.
  • It is a most common basal stem and root disease of the soybean plant.
  • Lower leaves become chlorotic and wilting and drying is apparent.
  • The diseased tissues generally develop grayish discolouration.
  • The sclerotia look like black powdery mass hence the disease is known as charcoal rot.
  • Blacking and cracking of roots is the most common symptom.
  • The fungus survives in soil and crop debris in dry conditions.
  • Dry conditions, relatively low soil moisture and nutrient and temperature ranging from 25o C to 35o C are favourable for the disease.

Management

  • Deep ploughing in summer.
  • Ensure balanced fertilization of the crop.
  • Rotate soybean with cereals.
  • Maintain well drained field
  • Destroy last years infected stubble.
  • Seed treatment with T. viride @4g/kg or P. fluorescens @ 10g/ kg of seed or Carbendazim or Thiram 2g/kg of seed.
  • Spot drenching with Carbendazim 1g/lit or P. fluorescens / T. viride 2.5 kg/ha with 50 kg FYM