PEST MANAGEMENT DECISION GUIDE: GREEN LIST
Coffee leaf rust
- Hemileia vastatrix is a fungus which infects coffee trees, causing coffee leaf rust. The fungus is spread by spores between leaves, resulting is defoliation and dieback.
- Use recommended tree spacing of 3x3m to reduce humidity and fungal spread.
- Use of resistant varieties e.g. Catimor, S.73 or Bourbon.
- Use of organic manure to increase nutrients for plants, as low-nutrient trees are more susceptible to rust.
- Weeding and pruning of all unnecessary vegetation (important to do after harvest) to reduce the humid environment which supports fungal spread.
- Regularly monitor trees for rust fungus symptoms:
- Yellow/orange powdery spots on the underside of leaves with corresponding yellow patches on upper side. 2-3 mm diameter, will increase in size up to 4 cm.
- Centre of spots become necrotic and turn brown.
- Necrotic leaf area may spread until entire leaf is dead.
- Infection of leaves results in defoliation, this may be premature in some trees.
- Infection of tree may cause premature ripening of fruit, resulting in low quality coffee beans.
- Prune and burn heavily infected branches, this will open up the crop area and reduce favourable environment for fungus.
CREATED/UPDATED: April 2018
PRODUCED BY: Plantwise
©CAB International. Published under a CC-BY-SA 4.0 licence.