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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Black Sigatoka on bananas

Mycosphaerella fijiensis (Also known as Pseudocercospora fijiensis)
Malawi
  • Use disease free planting material
  • Use tolerant or resistant varieties e.g. TMBX and SH 3640, FHIA 02, FHIA 03, FHIA 17
  • Do not move infected plant material into an uninfected area
  • Use recommended spacing (2.5m apart) to ensure good air circulation which alllows the leaves to dry quickly after rains. Avoid too shade from trees
  • Ensure good drainage and plant in well drained soils - avoid clay soils
  • Weed frequently
  • Monitor the crop closely during wet or humid conditions as these are optimal conditions for the disease to spread
  • Early symptoms on leaves are small red/brown streaks (1-5mm long by 0.25mm wide) parallel to the veins on the underside of the 3rd or 4th young leaf
  • As the disease progresses the streaks expand and become noticeable on the leaf surface. Grey lesions develop with sunken centres they have black margins with bright yellow halos
  • The streaks join together forming bands of dead areas several cm wide and the leaves collapse and die
  • Take action as soon as the first symptoms are seen
  • Collect older infected leaves on a regular basis and take them out of the plantation and burn them
  • Alternatively heap the infected leaves on top of each other with the lower surface of the leaves facing downwards to reduce the spread of the disease
  • Use personal protective equipment when handling and applying pesticides, follow the label recommendations.
  • Do not eat, drink, smoke when mixing or applying pesticides.
  • Not recommended for small holder farmers. Larger scale/commercial banana producers may use the options below:
  • The FRAC has reported that M. fijiensis has a high risk of developing resistance to fungicides, so careful fungicide management is required
  • Mancozeb 800g/kg (Dithane M45 WP; Emthane M45; Mancozeb WP; Uthane 800 WP) at a rate of 2.5kg/100L of water (plus 4-5L of light/medium mineral oil) FRAC group: M3
  • WHO Classification U (Unlikely to present acute hazard in normal use) Spray when disease symptoms appear
  • Chlorothalonil 500g/L (Chloroflo 500 SC) 5.6L/ha FRAC group: M5
  • WHO Classification U (Unlikely to present acute hazard in normal use) Spray when disease symptoms appear and ensure thorough coverage of the leaves
  • Tebuconazole 250g/L (Folicur 250 EW; Tenazole 250 EW) apply at 750ml/ha FRAC group: 3
  • WHO Classification II (Moderately hazardous) Apply in 300L of water/ha. Spray as soon as symptoms appear and repeat as necessary
  • Mancozeb 64%+ Metalaxyl 8% WP at 2.5kg/100L of water (plus 4-5L of light/medium mineral oil) FRAC groups: M3 & A1
  • WHO Classification U (Unlikely to present acute hazard in normal use) and II (Moderately hazardous). Spray when disease symptoms appear
AUTHOR(S): Aggrey Sichimata (Mzuzu ADD, Ministry of Agriculture, Irrigation and Water Development)

CREATED/UPDATED: July 2018
PRODUCED BY: Plantwise

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