Antixenosis in soybean to Spodoptera cosmioides (Lepidoptera: Noctuidae) mediated by leaf color and trichome density

Abstract

The importance of Spodoptera cosmioides (Lepidoptera: Noctuidae) in soybean crops has been growing, mainly with the cultivation of transgenic Bt plants. The objective of this study was to evaluate antixenosis to S. cosmioides in soybean plants with different leaf colors and trichome densities. Antioxenosis was evaluated by non-preference for feeding and oviposition assays. The study was performed in no-choice and free-choice tests using the genotypes Anta 82, BMX Desafio, BMX Potencia, BRS 397, BRS GO 6970 IPRO, BRS 7270 IPRO, BRS 7470 IPRO, BRS 8170 IPRO, BRS 8482, BRS GO 7460, BRS GO Jatai, IAC 100, M 7739 IPRO, NA 5909, NS 7338 IPRO, NS 7447 IPRO, PI 227682 and PI 227687. The genotypes IAC 100, PI 227682 and PI 227687 showed antixenosis to S. cosmioides mediated by leaf color and trichome density. These genotypes could be appropriate for breeding programs aiming to incorporate sources of resistance to S. cosmioides. The cultivar M 7739 IPRO can be used by soybean producers as a control strategy for S. cosmioides due to moderate resistance.