Identification of Resistance to the Corn Weevil (Sitophilus zeamais M.) in Mexican Maize Races (Zea mays L.)

Sitophilus zeamais (Motsch.) (Coleoptera: Curculionidae) has a global distribution and is one of the most important post-harvest pests maize (Zea mays L.). Some Mexican races could be novel source resistance against S. to improve commercial maize, generating lines, varieties, hybrids with pest. These are original from center origin have been exposed selection pressure other for thousands years, which probably resulted in some type resistance. We studied focusing on antixenosis, antibiosis, tolerance. Antibiosis reduces survival reproduction insect or prolongs time between generations, whereas antixenosis rate initial successive accumulation population. Obligate-antibiosis free-choice bioassays were performed, those experiments, traits consumption by measured. The resistant accession showed high adult mortality fewer adults 1st generation, where number emerged an ideal trait evaluate level Net (in grams) economically because it indicates gross amount lost store, while yield losses (percentage consumption) allow studying endosperm did influence resistance/tolerance zeamais. flint varieties significantly higher before entering seed, lower quantity first generation obligate-antibiosis bioassay, net percentage both bioassays. In general, Cristalino de Chihuahua, Apachito, Azul levels resistance, Cristalino-079 (flint) (floury) accessions also being tolerant, low Both used breeding programs reduce caused