Breeding for multiple resistance to temperate, subtropical, and tropical maize insect pests at CIMMYT.
1989
Smith M.E. | Mihm J.A. | Jewell D.C.
Since it began over 20 years ago, a major research objective of the CIMMYT maize improvement program has been to develop germplasm with resistance to the most important insect pest species. Early efforts in maize insect resistance focused on developing resistance to a single generation of a pest. Since maize is usually produced where there are more than a single insect or disease pest, CIMMYT has begun developing materials to screen for resistance to multiple generations and species of insects, in addition to improving resistance to disease pests. Such screening has been possible only recently, as capabilities for mass rearing and artificial infestations with the pests were developed in several key pest regions. This paper describes: (1) the inheritance and mechanisms of resistance; (2) the methodology used in developing maize populations with potential multiple resistance and good agronomic qualities for temperate, subtropical, and tropical growing areas; (3) results of international testing and evaluation of resistance to European corn borer (Ostrinia nubilalis), southwestern corn borer (Diatraea grandiosella), sugarcane borer (D. saccharalis), spotted sorghum stem borer (Chilo partellus), African maize stem borer (Busseola fusca), and fall armyworm (Spodoptera frugiperda; (4) how these resistance sources are being used in the breeding program to develop resistant cultivars (varieties and hybrids); and (5) complementary studies on sampling methodology and larval survival and development on resistant germplasm.
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