LOSE LESS, FEED MORE
Plantwise is a CABI-led global initiative.
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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST Bean rust Uromyces phaseoli; local name: Kutu ya maharagwe (Swahili) Bean rust spots on bean leaf
(Photo by AgrEvo)
Prevention
Monitoring
Direct Control
Direct Control
Restrictions
Practice two year crop rotation
with non-leguminous plants. Remove and burn old crop
residues since the disease can
live for one year on the material
left in the field. Plant resistant varieties like GLP-
X 1127 new mwezi moja, New
rose coco, Kutuless (J12). Use clean bean seeds originating
from non-diseased plants or from
certified seeds dealers. Deep plough to about 45 cm to
turn residues into the soil to
encourage rotting of the plant
remains and reduce the amount
of fungal disease carried over to
the next bean season. Plant bean seeds during the end
of the rainy season and not at the
start of rainy season because
bean rust thrives during the wet
conditions. Maintain weed free field in
particular remove alternate host
crops e.g. Oxalis spp.
Monitor for small
orange to yellow halo
like powdery pustules
on the upper side and
orange to red circular
pustules on the lower
leaf surface. Lesions are found on
the petioles, pods and
the stem but more
abundant on the
leaves. Consider applying
chemicals when two to
three leaves per plant
get affected.
Pick affected leaves,
place in a plastic bag
and destroy as soon as
possible to prevent
spores from spread Avoid walking through
the field during wet
weather to prevent
disease spread from
one plant to another. Pick affected leaves into
the polythene bags
(prevents spread) and
burn them.
Hexaconazole (e.g.
Anvil)
Slightly hazardous (WHO
Class III)
Chlorothalonil (e.g.
Daconil)
Unlikely to cause harm in
normal use (WHO Class U) FRAC mode of action 3. Toxic to aquatic organisms. Do not spray near surface
water or empty into water
drains.
Mancozeb
Unlikely to cause harm in
normal use (WHO Class U) FRAC mode of action 3. Toxic to aquatic organisms. Do not spray near surface
water or empty into water
drains.
General
Always use PPE and follow
the instructions on the
product label (dosage, timing
of application and pre-
harvest interval)
Kenya CREATED: July 2013
AU THORS: Eunice K. Ringera (KEPHIS), Miriam Otipa (KARI), MaryLucy Oronje (CABI) and Margaret Mulaa (CABI)
EDITED BY: Melanie Bateman (CABI) and Erica Chernoh (CABI)
