A maize breeding program for development of hybrids with resistance to multiple species of leaf-feeding and stalk-boring Lepidoptera.
1989
Overman J.L.
Resistance to the European corn borer (ECB), fall armyworm (FAW), and southwestern corn borer (SWCB) occurs in the whorl stage of the maize lines Mp705, Mp706, and Mp707. A breeding program is described for introgressing this multiple resistance into susceptible U.S. elite lines. The breeding cycle consists of selecting Mp X elite germplasm for FAW resistance in the S0 and S2 generations in the winter nursery in Florida, SWCB resistance in the S1 generation and ECB resistance in the S3 generation of inbred development at the summer nursery at Union City, Tennessee. All S0 and S2 selections for FAW resistance also showed enhanced resistance to the corn borers. Inbreds developed in this program have been crossed onto FAW-and SWCB-susceptible U.S. Corn belt lines. These hybrids were evaluated in infested and noninfested yield trials. The multiple-resistant hybrids showed a yield advantage over commercial hybrids in all infested yield trials. Many of these multiple-resistance hybrids were also fully competitive with the best commercial hybrids in the regular yield trials.
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