Varietal resistance of creole Sweet corn to Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

• Autor(a) principal: Goedel, Aline Dapont
• Data de Publicação: 2021
• Outros Autores: Faita, Marcia Regina, Poltronieri, Alex Sandro
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Research, Society and Development
• Texto Completo: https://rsdjournal.org/index.php/rsd/article/view/21309
• topic: Lagarta-do-cartucho; Manejo integrado de pragas; Zea mays L.; Oruga de cartucho; Manejo integrado de plagas; Zea mays L.; Fall armyworm; Integrated pest management; Zea mays L.

The fall armyworm Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) is considered a key pest in the conditions of cultivation of sweet corn (Zea mays L.). It’s management is based on the use of broad-spectrum insecticides, whose use results in great environmental and human health impacts. In this sense, the use of varieties that are resistant to pest attack emerges as a less impactful management strategy. This study analyzed the performance of creole and commercial sweet corn varieties against the attack of S. frugiperda. The experiment was conducted under field conditions in randomized complete block design with four replications for each of the twenty sweet corn varieties tested, 19 of which were creole and one provided by the Instituto Agronômico de Campinas. The damages of S. frugiperda were evaluated according to the visual scale of notes and the monitoring of population fluctuation with use of Delta traps with synthetic pheromone. There was a significant difference in the level of damage at 42, 63, 70 and 77 days after sowing. Among the varieties tested, 66.7% had a low level of damage and 33.3% had a medium level. The population fluctuation of males of S. frugiperda remained below the level of economic damage throughout the study period. A possible resistance of the evaluated varieties associated with environmental factors and spraying with insecticides may have contributed to the behavior for the low level of damage caused by S. frugiperda.