This study aimed to identify peanut cultivars resistant to Spodoptera frugiperda by determining the degree of resistance through univariate and multivariate analyses. The genetic material under evaluation comprised cultivars of the upright growth habit (IAC 5, IAC 8112, IAC 22 and IAC Tatu ST) and runner growth habit (IAC 503, IAC 505, IAC 147, IAC 125, IAC Caiapó and IAC Runner 886), grown under field conditions. Individual first instar larvae were placed in Petri dishes, on humidified filter paper, and maintained under controlled conditions of temperature (25±2 °C), humidity (60±10%) and photophase (12 hours). Ten newly hatched caterpillars were arranged in a completely randomized design with five replications. New leaves previously washed with 1% sodium hypochlorite were provided daily. The duration (days), weight (mg) and viability (%) of larval and pupal periods, the sex ratio, adult longevity and adult female fecundity were evaluated. All data recorded were submitted to analysis of variance by F test, and treatments were compared by the Tukey test (p<0.05). Additionally, clustering and principal components analyses were performed. The cultivar IAC 22, of upright growth habit, and Runner IAC 886, of runner growth habit, were the least favorable substrates for the insect development, indicating resistance to S. frugiperda.
fall armyworm; Arachis hypogaea; cultivars; host plant resistance; multivariate analysis
