Sources of resistance in maize to stem borer in mid-altitude intermediate areas of Kenya.
1995
Gethi M.
In the present investigations, field experiments were conducted at Embu Regional Research Centre during the 1990/91 cropping seasons. Evaluation of possible sources of resistance to Chilo partellus (Swinhoe) and Busseola fusca (Fuller), were carried out on local germplasm, CIMMYT populations and breeder lines under natural infestation. Parameters used for evaluation were foliar damage, stalk tunnelling, borer exit and entry holes, and the number of stem borer larvae and pupae present. Results indicated that there were significant differences between cultivars in the components (parameters) of resistance that were measured. These differences were evident, not only on the relative indices for resistant components, but also in their overall resistance and susceptibility values. CIMMYT germplasm was found to be moderately resistant to stem borers. Single cross hybrids of SR 52 lines (line 7 and 11) and open pollinated cultivars (Embu 11 and 12) showed high overall resistance/susceptibility index (ORSI) reflecting high susceptibility for almost all the parameters used. From the data presented, I conclude that some of the parameters, especially foliar damage, will allow the identification of sources of resistance and may subsequently be used during selection.
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