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Resistance in maize to the Larger Grain Borer,Prostephanus truncatus(Horn) (Coleoptera: Bostrichidae)

Journal of Stored Products Research
Publication Date
DOI: 10.1016/s0022-474x(01)00030-3
  • Plant Resistance
  • Prostephanus Truncatus
  • Zea Mays
  • Stored Products


Abstract Host plant resistance in maize can be a useful component of Integrated Pest Management (IPM) of the Larger Grain Borer (LGB), Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae). The germplasm bank of the International Maize and Wheat Improvement Centre (CIMMYT) has more than 14,000 maize accessions from all over the world. In 1993, from the seed regeneration nursery of Caribbean land races, 105 land races were selected using good plant type as the criterion. When grains of these land races were infested with LGB in the laboratory, 19 showed resistance as evidenced by the low amount of powder (chewed uneaten maize plus feces) formed 140 days after the infestation. Through a series of infestation, selection and inbreeding (self-pollination of land races) over four generations, S 3 maize ears were generated. These ears showed a high level of resistance as indicated by a low powder production relative to the susceptible control. The LGB reproduction was adversely affected on resistant ears as indicated by the small size of adult populations. Thus, antibiosis could be the mechanism of resistance operating within the S 3 progenies of selected land races. Such sources of resistance can be very useful in developing maize populations/hybrids for use in IPM of LGB.

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