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PEST MANAGEMENT DECISION GUIDE: GREEN LIST

Crown rot of groundnut

Aspergillus niger Collar rot of Groundnut, Aspergillus crown rot
  • Plant high quality seeds
  • Use Trichoderma viride/T. harizanum to treat seeds at 4g/kg of seed and soil application at 25-62.5kg/ha
  • Use organic fertilizers, such as alfalfa, castor cake, neem cake or mustard cake, at 500 kg/ha. Neem cake also has anti-fungal properties
  • Maintain adequate and uniform soil moisture during seedling stage as fluctuations in soil moisture can aggravate the disease.
  • Control root and stem boring insects whose feeding damage can also aggravate the disease
  • Do not plant near vegetables which show symptoms of Aspergillus (e.g. tomatoes, grapes, onions, mangoes, garlic, maize, banana, cotton) - the host range is very large
  • Control numbers of root and stem boring insects (e.g. lesser corn stalk borer), since feeding damage caused can encourage the development of crown rot
  • Minimise damage caused to seedlings by minimising the use of pesticides and the amount of soil thrown against plants during cultivation
  • Crown rot is a fungus which is found in the soil and lives on dead and decaying vegetation and leaves, compost piles and stored grain. It is spread via air, soil and water.
  • Monitor carefully for crown rot of germinating seedlings (damping off) at temperatures greater than 30°C
  • Infected areas of seedlings become watersoaked then light brown, and eventually are covered with black sporulating structures (fungus). Seedlings rapidly collapse and die
  • In moist soils, seeds may die due to rotting and when removed from soil, they show a black sooty cover
  • Mature plants show permanent wilt of branches, and/or wilting of entire plant. If dead and dried branches are pulled they will easily detach from the collar region
  • Root curling and deformation of upper plant parts
  • Pods have patches of black sooty spores
  • Remove the previous season's infected crop residues from the field and destroy to reduce source of infection

CREATED/UPDATED: December 2017
PRODUCED BY: Plantwise