Agricultural crops :: Cash crops :: Cotton
Boll Rot: Fungal complex
Fungal pathogens involved in boll rot are Fusarium moniliforme, Colletotrichum capsici, Aspergillus flavus, Aspergillus niger, Rhizopus nigricans, Nematosporanagpuriand Botryodiplodia sp.
Symptom
- Disease appears as small brown or black dots which later enlarge to cover the entire bolls.
- Infection spreads to inner tissues and rotting of seeds and lint occur.
- The bolls never burst open and fall off prematurely.
- Fruiting bodies of fungi are observed on the bolls .
Survival and Mode of Spread
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The fungi survive on the infected bolls in the soil.
- Primary spread is through infected bolls.
- Secondary spread is through air-borne conidia.
Favourable Conditions
- Heavy rainfall during the square and boll formation stage .
- Punctures caused by the insects
- Closer spacing
- Excessive nitrogen application.
Management
- Adopt optimum spacing.
- Apply the recommended doses of fertilizers.
- Spray Copper oxy chloride @1000 g/acre or Carbendazim @ 200 g /acre or Mancozeb @ 800 g / acre.
Source of information
- Online resources
- CPG 2020
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Boll Brown spot |
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Lint staining |
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Boll rot - Lint staining - 2 |
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Boll rot - Lint staining - 3.jpg |
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