Susceptibility of different genotypes of rice to Sitophilus zeamais Motschulsky 1885 attack (Coleoptera: Curculionidae)

Rice (Oryza spp.), the most important cereal in the world, is grown and consumed in all continents. Brazil is among the top ten producing countries. Stored grains can be attacked by pests (rodents, insects, fungi and mites) that cause serious qualitative and quantitative losses. Because of these losses, one way to alleviate the problem caused by insects during rice storage is the use of resistant materials (grains). Thus, the aim of this study was to evaluate grains from nine different genotypes of rice, in order to identify the existence of materials less susceptible to the attack of Sitophilus zeamais, during 180 days of storage. The mean time of biological cycle (days), susceptibility index (IS) and the number of weevils emerged were evaluated. According to the results, grains of the genotypes IRGA 426 and Puita were the most susceptible and the genotypes BR-IRGA 409, IRGA 424, IRGA 425 and IRGA 427 were the least susceptible to the attack of Sitophilus zeamais.