Sitotroga cerealella (Oliv.) (Lepidoptera: Gelechiidae) is one of the most important post-harvest pests of maize Zea mays L. Some Mexican maize races (Z. mays) could be a novel source of resistance against S. cerealella to improve commercial maize varieties, lines and hybrids. We studied the resistance of Mexican maize races, recollected at Chihuahua State to S. cerealella. We focused on antibiosis and tolerance of maize to S. cerealella. Cristalino-079 maize race shows low level of consumption in grams and percentage, increased larvae mortality before to entering the seed. In addition, Cristalino-079 reduced first adult’s generation and show the largest biological cycle. Due to the small number of emerged adults, there was very little grain weight loss in resistant maize race. The compound that causes high mortality of larvae before to entering the grain is in the pericarp of resistant maize races. The compound that causes longest development time is in the endosperm and embryo. Cristalino-079 show the better level of resistance to S. cerealella infestation in almost all traits studied and this can be used as source of resistance for maize breeding.

Sitotroga grainella (Oliv.) (Lepidoptera: Gelechiidae) 是玉米收获后最重要的害虫之一Zea mays L. 一些墨西哥玉米品种 ( Z. mays ) 可能是一种新的抗S. grainella的来源以提高商业化玉米品种、品系和杂交种。我们研究了在奇瓦瓦州收集的墨西哥玉米品种对S. grainella的抗性。我们专注于玉米对S. grainella的抗菌和耐受性. Cristalino-079 玉米品种的消耗量（克数和百分比）较低，幼虫在进入种子前死亡率增加。此外，Cristalino-079 减少了第一成虫的世代并显示出最大的生物周期。由于出苗的成虫数量较少，抗性玉米品种的籽粒失重很少。在进入籽粒之前导致幼虫高死亡率的化合物存在于抗性玉米品种的果皮中。导致最长发育时间的化合物存在于胚乳和胚胎中。Cristalino-079 在所研究的几乎所有性状中都显示出更好的抗谷草属侵染性，这可用作玉米育种的抗性来源。