| dc.description.abstract | Bean rust caused by Uromyces appendiculatus (Per.
ex. per) Unger val'. appendiculatus is an important
disease of beans in Kenya. Work was carried out on'
this disease to investigate the variability of the
pathogen in Kenyan rust isolates and to evaluate bean
cultivars for resistance to rust.
Rust isolates from four different sites in Kenya
were differentiated using 20 differential cultivars.
Inoculation was done by spraying a urediospore
suspension onto the primary leaves of nine-day old
seedlings, which were then incubated for 24 hours in
the greenhouse. Host reactions were recorded 14 days
after inoculation. The host-pathogen interactions indicated
variability of Uromyces appendiculatus among the
isolates from the different sites. Seventy-seven
cultivars were evaluated for resistance to a mixture of
specific isolates from different sites. The cultivars
NB 2405 and NB 132 were immune and NB 123, NB , ", "' 14, NB
127,NB 225 and NB 63·'were highly resistant.
It was found that rust isolates from different
site's may cause different; react'ions on the same host
due to variability of the rust 'fungus, and the
cultivars identified as either immune or highly
resistant
resistance
were
in the
recommended as
varieties in Kenya.
development
possible
of resistant
sources of
bean | en |
