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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Bacterial Blight of Cassava (CBB)

Xanthomonas axonopodis pv. manihotis
Ghana
  • The disease is transmitted through stem cuttings, use healthy planting materials obtained from plants without symptoms
  • Plant resistant varieties e.g. Bankyehemaa and Esam bankye sourced from RTIMP or MoFA Agricultural Stations
  • Disinfect farming tools in bleach (5 parts of bleach to 95 parts of water)
  • Remove old cassava plant debris from previous plantings and burn after harvest
  • Avoid planting on land with history of CBB. Fallow previous fields for a period of 3-5 years if pressure on land is low or rotate cassava with legume or grains
  • Avoid transferring planting materials from CBB endemic areas to new cassava fields
  • Monitor cassava field regularly (every week) after sprouting for symptoms of the disease such as dieback, angular brown or black blight lesions especially at the beginning of the wet season
  • Examine leaves for water soaked lesions and gummy exudates
  • Implement control when symptoms are seen at any stage of growth
  • Rogue and burn infected plants that have just appeared to prevent spread
  • At the first sign of the disease immediately harvest mature roots and destroy all remaining plants and plant debris by burning
  • There are no direct chemical controls for CBB
AUTHOR(S): Moses, E (CSIR-Crops Research Institute) and Woode, R (Ministry of Food and Agriculture)

CREATED/UPDATED: July 2014
PRODUCED BY: Plantwise

©CAB International. Published under a CC-BY-SA 4.0 licence.