Evaluating maize for resistance to tropical stem borers, armyworms, and earworms
1989
Mihm, J.A. (CIMMYT, Mexico, DF (Mexico). Maize Program)
The methods and techniques used at CIMMYT in the maize improvement program in evaluating germplasm for resistance to the sugarcane borer (Diatraea saccharalis Fabricius), the southwestern corn borer (D. grandiosella (Dyar)), the fall armyworm (Spodoptera frugiperda J.E. Smith), and the corn earworm (Heliothis zea (Boddie)) are presented. These include field plot design, methods of uniform artificial infestation, and methods of assessing the resultant plant damage, or lack of it, to determine categories of resistance or susceptibility, as well as preliminary indications of mechanism and basis(es) of resistance. These methods are useful in both screening efforts to identify potential sources of resistance and utilizing known sources in a resistance improvement program.
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