Relative susceptibility of cowpea genotypes against spotted pod borer, Maruca vitrata Fabricius (Lepidoptera : Pyralidae)

摘要

Field experiments carried out for two consecutive kharif seasons (1996 and 1997) revealed that larval population of spotted pod borer, Maruca vitrata Fab. ranged from 0.67 (Pusa Phalguni) to 2.83 (GC 8949) per plant. Looking to the spotted pod borer damage, none of the genotypes was found to be resistant. Pusa Phalguni and GC 8968 were categorized as less susceptible genotypes while GC 1, GC 3, GC 8923, GC 8926, GC 8947, GC 8966 and GC 8968 were grouped into moderately susceptible category. Four genotypes viz., GC 8910, GC 8916, GC 8927 and GC 8929 were categorised as susceptible genotypes while GC 2, GC 8949 and GC 8956 were categorized as highly susceptible ones.