Management of maize insects with resistant cultivars in the Southern Region of the United States
1989
Rogers, C.E. (USDA Agricultural Research Service, Tifton, GA (USA). Insect Biology and Population Management Research Laboratory)
Maize serves as a nursery crop in the southern United States and produces large insect populations of the corn earworm Heliothis zea (Boddie), and fall armyworm, Spodoptera frugiperda (J.E. Smith), that either reinfest local crops or migrate and infect crops tens or hundreds of kilometers downwind. Numerous maize germplasm lines or inbreds with resistance to insect pests have been developed for southern latitudes. However, industry has not yet incorporated these lines or inbreds into commercial hybrids that reduce maize damage by pests in the southern United States. Tolerance to ear injury by H. zea and S. frugiperda, available in the form of long, tight husks, is of little value in reducing populations of these pests. Antibiosis is the resistance mechanism that the maize industry should strive for because of its negative effects on local pest populations and its potential for reducing the number of progeny available for long-range migration. This paper also discusses the pest status and resistance factors available for southwestern corn borer, Diatraea grandiosella Dyar, maize weevil, Sitophilus zeamais Motschulsky, and pink scavenger caterpillar, Pyroderces rileyi (Walsingham). New biotechnology techniques that may have an impact on host plant resistance research and the maize industry in the future are briefly presented.
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