Dissertação
Controle e danos de Melanagromyza sojae (Zehntner, 1900) (Diptera: Agromyzidae) em soja
Fecha
2023-04-19Autor
Ramon, Paulo Cesar
Institución
Resumen
Soybean is the main grain crop grown in Brazil, with great importance for world
food security. The soybean stem fly (SSF) Melanagromyza sojae (Diptera:
Agromyzidae) is an invasive pest recently identified and categorized in Brazil, which
has a great potential for damage to the soybean crop, especially in the second soybean
crop (sown from December 31th). The damage caused by the SSF is due to its feeding
process, as it forms galleries inside the stems of soybean plants, harming the
development of the crop. As it is a recent pest in Brazil, there is only one insecticide
registered for control via seed treatment. The objective of this work was to evaluate
the reduction of damage caused by SSF in soybean, by 15 insecticides registered for
soybean crop, regularly recommended for the management of other soybean pests.
Two experiments were conducted during the 2021 (first season) and 2022 (second
season) growing seasons, under different conditions of rainfall and SSF population
pressure. The experimental design used was completely randomized with split plots in
time with 16 treatments and 20 replications at 8 time levels in 2021 and 5 time levels
in the 2022 season. The results showed that in the two seasons evaluated, the best
treatments to reduce SSF damage were chlorpyrifos and cyantraniliprole applied
weekly. The lowest levels of protection against SSF damage were registered for the
methomyl treatment. The highest yields, in both years, were obtained in the treatments
with chlorpyrifos and cyantraniliprole, demonstrating correlation with the damage
reduction data by SSF. The results of this study point to a high potential for damage
by the soybean stem fly, which can be mitigated by the use of chemical insecticides,
as long as they are applied in the early stages of the soy crop