Comparison of some maize genotypes for resistance to the maize weevil, Sitophilus zeamais Motsch. (Coleoptera: Curculionidae) in Ethiopia
1995
Tadesse, A. | Medhin, T.G. | Hulluka, M.
Twenty five maize genotypes obtained from different local sources were evaluated for resistance to the maize weevil under uncontrolled laboratory conditions. Ninety grams of cleaned and disinfested grains of each genotype were put in a 350 ml glass jar and arranged in a randomized complete block design with four replications. Uninfested controls were also set up in the same manner. Twenty-six 3 to 15-day-old weevils were placed in each of the glass jars. After seven days, the weevils were removed and the grains were kept for progeny emergence. Progenies emerged, development time, indices of susceptibility, grain damage and percent weight losses were recorded. Results showed that the genotypes differed significantly in their susceptibility to the maize weevil. Four genotypes were consistently resistant, 6 were moderately resistant, 5 were highly susceptible and 10 were inconsistent in their category based on the different parameters used. Significant variations for resistance to weevil damage indicated that maize cultivars should be screened for susceptibility to weevils during their development in order to ensure that their storage characteristics are acceptable.
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