Ação de clorantraniliprole e espinetoram sobre Spodoptera frugiperda no milho e clorantraniliprole e clotianidina sobre Melanagromyza sojae na soja via tratamento de sementes

• Ano de defesa: 2024
• Autor(a) principal: Cavallin, Lucas de Arruda
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; Brasil; Engenharia Agrícola; UFSM; Programa de Pós-Graduação em Engenharia Agrícola; Centro de Ciências Rurais
• Palavras-chave em Português: Spodoptera frugiperda; Melanagromyza sojae; Tratamento de sementes; Seed treatment; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA
• Link de acesso: http://repositorio.ufsm.br/handle/1/33491

Seed treatment is one of the main methods for controlling pests that occur during the early stages of crop establishment, such as the fall armyworm (Spodoptera frugiperda) in corn and the soybean stem fly (Melanagromyza sojae) in soybeans. Combined with seed treatment, the mixture of insecticides is an important alternative for increasing the efficiency of this tactic and consequently reducing crop damage. This thesis comprises two articles, with the following objectives: 1) to evaluate and characterize the effects of Chlorantraniliprole and Spinetoram in controlling Spodoptera frugiperda in corn, applied via seed treatment; and 2) to evaluate and characterize the effects of Chlorantraniliprole and Clothianidin on Melanagromyza sojae in soybeans, applied via seed treatment. In the first article, the objective was to assess the reduction of damage caused by S. frugiperda in corn through the application of a mixture of Chlorantraniliprole and Spinetoram via seed treatment. Five experiments were conducted during the 2022, 2023, and 2024 growing seasons, three in the field and two in greenhouse/laboratory settings. The experimental design was a randomized block with 4 replications and 10 treatments. Evaluations were performed at the V2, V3, V4, and V5 stages. The results indicate that the mixtures of Chlorantraniliprole (250 or 500 μg/seed) + Spinetoram (250 or 500 μg/seed) applied via corn seed treatment can be efficient alternatives for managing S. frugiperda in corn, protecting the plants during the first 20 days after sowing and delaying or reducing the need for foliar sprays on the crop. In the second article, the objective was to assess the reduction of damage caused by M. sojae in soybeans through the application of a mixture of anthranilic diamides and neonicotinoids via seed treatment. Three experiments were conducted during the 2021, 2022, and 2023 growing seasons. The experimental design was a randomized block with 4 replications and 7 treatments. Evaluations were performed at the V1, V2, V3, and V4 stages. The results show that the insecticide treatments containing Chlorantraniliprole at a dose of 62.5 g a.i./100 kg of seeds or Cyantraniliprole at 48.0 g a.i./100 kg of seeds were the most efficient in reducing damage and attacked plants, achieving the highest control of M. sojae in soybeans and obtaining the highest yields, regardless of being mixed with Clothianidin at 48.0 g a.i./100 kg of seeds or Thiamethoxam at 42.0 g a.i./100 kg of seeds.