Antixenosis in soybean to Spodoptera cosmioides (Lepidoptera: Noctuidae) mediated by leaf color and trichome density
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ORIGINAL ARTICLE
Antixenosis in soybean to Spodoptera cosmioides (Lepidoptera: Noctuidae) mediated by leaf color and trichome density Erielma B. de Queiroz & Franciele C. da Silva & Célio Borella Junior & Marcio S. Araújo & Edson Hirose & Flávio G. de Jesus Received: 15 April 2019 / Accepted: 13 August 2020 # Springer Nature B.V. 2020
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 Potência, BRS 397, BRS GO 6970 IPRO, BRS 7270 IPRO, BRS 7470 IPRO, BRS 8170 IPRO, BRS 8482, BRS GO 7460, BRS GO Jataí, 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. E. B. de Queiroz : M. S. Araújo University of Goias State, Campus de Ipameri, Ipameri, GO, Brazil F. C. da Silva : C. B. Junior : F. G. de Jesus (*) Federal Goiano Institute, Campus Urutaí, Rod. Prof. Geraldo Silva Nascimento, Km 2,5, CEP, Urutaí, GO 75790-00, Brazil e-mail: [email protected] E. Hirose EMBRAPA Soybean, Londrina, PR, Brazil
Keywords Plant resistance to insects . Non preference . Black armyworm . Glycine max
Introduction The soybean is the most important crop in Brazil due to its high production and diversity of uses such as vegetable oil, animal feed, human food and, biodiesel. (Carvalho et al. 2015; Andrea et al. 2016). Among the Spodoptera that attack soybeans, the black armyworm Spodoptera cosmioides (Lepidoptera: Noctuidae) occurs sporadically; however, infestations have become frequent in regions of the Brazilian Cerrado (Santos et al. 2010). Outbreaks are caused by several factors including the extensive area devoted to soybeans and cotton (Santos 2007; Santos et al. 2009; Boiça Júnior et al. 2015b), and the adoption of transgenic Bt plants that do not provide effective control of Spodoptera (e.g. those that express Cry1Ac). S. cosmioides causes direct damage to soybean leaves and pods (Bueno et al. 2011; Panizzi et al. 2012; Boiça Júnior et al. 2015a). S. cosmioides is usually controlled by chemical insecticide applications (Ávila et al. 2013); however, few commercial products are registered for this species in Brazil (AGROFIT 2018). Therefore, Integrated Pest Management (IPM) programs require strategies that can reduce insecticide use (Sosa-Gomez and Silva 2010; Bernardi et al. 2014; Bortolotto et a
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