Tese
Integração de inseticidas biológicos e químicos e tecnologia de aplicação no controle de lagartas da soja
Fecha
2021-12-23Autor
Curioletti, Luis Eduardo
Institución
Resumen
The purposes of this thesis are to propose new strategies for the control of
caterpillars in soybean crops, integrating chemical and biological management, combining
aspects of application technology. This document comprises three scientific articles. The first
one entitled ‘’Use of ChinNPV and HaNPV in the control of Chrysodeixis includens (Hubner,
1858) (Lepidoptera: Erebidae) and Helicoverpa armigera (Hubner, 1805) (Lepidoptera:
Erebidae) in soybeans in Rio Grande do Sul”, aims to evaluate the effect and efficiency of
baculoviruses on caterpillar populations compared to chemical insecticides. Seven
experiments were carried out in commercial crops in different municipalities of RS, in the
2016/17 season. The results allow us to conclude the effectiveness and prolonged action of
ChinNPV and HaNPV in the control of caterpillars and crop protection. The second article,
entitled "Use of different management strategies in the control of Chrysodeixis includens in
soybean crops" aimed to quantify the effect of microbiological insecticides based on
baculovirus, ChinNPV, SfNPV and HaNPV, and Btk-based sprayed on a scheduled basis in
different combinations and application sequence compared to chemical program, producer
standard and control. The results allow us to conclude that the management of C. includens
was satisfactory, however, for the soybean caterpillar complex, it is essential to use monitoring
strategies to define the combination of microbiological insecticides and the moment of
application. In the third article, "Interaction between spray boom auxiliary mechanisms and
application times on the persistence and efficacy of ChinNPV baculovirus in the control of C.
includens in soybean crop", the aim of the study was to quantify the benefits of spray boom
auxiliary systems " canopy opener” and Vortex® system compared to the traditional system in
four different times, 9:30, 11:30, 14:30 and 17:30. The results indicate that the spray deposition
spectrum in the crop canopy is modified due to the spraying time and that the Vortex® spray
system was the most efficient in increasing the spray deposition in the lower segment of the
crop and together with the use of the “canopy opener” and the auxiliary spray boom systems
provided an increase in the efficiency of ChiNPV in the control of C. includens in the soybean
crop.