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Agricultural crops :: Cash crops :: Cotton

Verticillium wilt : Verticillium dahliae


  • Affects the crop in square and boll formation stages
  • Bronzing of veins followed by interveinal chlorosis, yellowing and scorching of leaves
  • Leaves exhibit drying of leaf margins and areas between veins shows “Tiger stripe symptom”
  • Affected plants remain barren showing pinkish discoloration in stem and wood.
Survival and Mode of Spread
  • Survive in the infected plant debris and in soils as microsclerotia up to 14 years. Seeds also carry microsclerotia and conidia in the fuzz.
  • Primary spread through soil.
  • Secondary spread through the contact of diseased roots to healthy ones and through dissemination of infected plant parts through irrigation water and other implements.
Favourable Conditions
  • Low temperature of 15-200C, low lying and ill-drained soils.
  • Heavy soils with alkaline condition.
  • Heavy doses of nitrogenous fertilizers.
  • Remove and burn the infected plant debris in the soil after deep summer ploughing.
  • Apply farm yard manure or other organic manures @4 t/ac.
  • Follow mixed cropping with non-host plants to lower the soil temperature below 200C by providing shade.
  • Follow crop rotation by growing paddy or lucerne or chrysanthemum for 2-3 years.
  • Treat the acid-delinted seeds with Chlorothalonil at 4 g/kg of seed .
  • Treat seeds with Bacillus subtilis (10g/kg) or Trichoderma asperellum @ 4 g/kg.
  • Apply Trichoderma asperellum @ 1 kg/ acre, twice in the soil during sowing and 90 DAS . Multiply 1 kg of T. asperellum in 100 kg of Farm yard manure for 15 days before application.
Source of information
  • Online resources

Tiger Stripe Symptom

Updated on Apr 2023

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