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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Bacterial blight of cassava

Xanthomonas axonopodis pv manihotis (Syn. Xanthomonas campestris) Bacterial blight of cassava
  • Bacterial blight is a soil borne bacterial disease that spreads through water splashes, mechanical damage and insect feeding (e.g. grasshoppers).
  • Clean and disinfect farm tools before using them on another farm.
  • Infected farmlands must be allowed to fallow for 2-3 years before planting cassava again. During the fallow period, cereals, grains or legumes can be planted.
  • Use of healthy planting materials from research institutes e.g. International Institute for Tropical Agriculture and certified sales outlets.
  • Use of resistant varieties like TMS30572, TMS91/02316 and 94/0026.
  • Disinfect cuttings by immersing in hot water (roughly 60°C) for 20 minutes before planting.
  • Intercrop with maize, sorghum or coco yam.
  • Planting materials infected with bacterial blight must not be moved into other farming areas.
  • Quarantine: cassava varieties from other countries must be tested before importation.
  • In potassium-deficient soils, increase use of fertilizers to increase potassium content in leaves to reduce the potential disease severity.
  • Pre-planting: check stem cuttings at vegetative stage for small green spots and lesions, from a month after planting onwards.
  • Check for white oozing when stem slices are immersed in water. Discard infected cuttings.
  • At vegetative stage (2 months onward), check both upper and lower sides of leaves. Look for gummy exudates from wounded leaves and stems. Discard such plants.
  • Look for symptoms like scattered or grouped brown spots with yellow patches on leaves.
  • Observe moist regions around leaf spots.
  • Look for fallen infected leaves and emergence of new leaves down the stem.
  • Urgent action is required if 5-10 out of 60 cuttings are affected and 10-15 out of 100 plants in the field.
  • If you see candle appearance of stems with blackened tips the direct contol actions are too late.
  • Roguing of infected plants immediately after first few rains. When carrying infected plants out of the field, do not touch healthy plants so not to infect them.
  • When a bacterial blight outbreak occurs, harvest healthy root tubers and incorporate all residue deeply into the soil. Thereafter, rotate with cereals, grains or legumes for 2 seasons.
  • Dust leaves with a thin layer of wheat flour which when fed on by the grasshopper, gums up its mouth part and prevents its feeding activities.
  • Introduce chicken and guinea fowl to feed on disease carrying insects (12 - 24 birds/acre).
  • Long grain traps: get rid of grasshoppers and other pests by growing a patch of uncut grass.
  • There is no direct chemical control of cassava bacterial blight available at the moment.
AUTHOR(S): Abdulsalam Sulaiman, Olasupo, Ibraheem O., Sani Ibrahim; Chinese Academy of Agricultural Science, Beijing. +2348065376105, +2348052216990, +2347032202864, , Email:asulaiman@abu.edu.ng, toibraheem@gmail.com, ibrahim.bot@buk.edu.ng

CREATED/UPDATED: March 2019
PRODUCED BY: Plantwise

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