Experimental Agriculture



SCREENING COMMON BEAN ACCESSIONS FOR RESISTANCE TO CHARCOAL ROT (MACROPHOMINA PHASEOLINA) IN EASTERN KENYA


W.  SONGA a1p1, R. J.  HILLOCKS a2, A. W.  MWANGO'MBE a3, R.  BURUCHARA a4 and W. K.  RONNO a5
a1 Department of Agriculture, The University of Reading, Earley Gate, Reading RG6 6AT, UK
a2 Natural Resources Institute, University of Greenwich, Chatham Maritime, Kent ME4 4TB, UK
a3 University of Nairobi, Department of Crop Science, PO Box 30197, Nairobi, Kenya
a4 Centro Internacional de Agricultura Tropical (CIAT), East African Bean Research Network, PO Box 6247, Kampala, Uganda
a5 Kenya Agricultural Research Institute (KARI), National Dryland Farming Research Centre, Katumani, PO Box 340, Machakos, Kenya

Abstract

Common bean (Phaseolus vulgaris L.) germplasm was screened for resistance to charcoal rot (Macrophomina phaseolina) under field conditions at Kiboko and Katumani, eastern Kenya. Of the 313 bean accessions evaluated, 50 lines were resistant and six were tolerant to M. phaseolina, the charcoal rot incidence was less than 25% and between 25% and 50% for the resistant and tolerant lines respectively. Yields ranged from 135 to 1051 kg ha−1 compared with 55 kg for the susceptible control A464. Time to maturity did not seem to influence or affect the susceptibility or resistance to M. phaseolina of the various bean accessions.

(Accepted May 20 1997)


Correspondence:
p1 Present address: Kenya Agricultural Research Institute, National Dryland Farming Research Centre, Katumani, PO Box 340, Machakos, Kenya.