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Caracterização da suscetibilidade a inseticidas reguladores de crescimento de insetos em populações de Helicoverpa armigera e Spodoptera frugiperda (Lepidoptera: Noctuidae) do Brasil
| Content Provider | Semantic Scholar |
|---|---|
| Author | Amado, Douglas |
| Copyright Year | 2017 |
| Abstract | Characterization of the susceptibility to insect growth regulator insecticides in populations of Helicoverpa armigera and Spodoptera frugiperda (Lepidoptera: Noctuidae) from Brazil Insect growth regulators have been one of the most important group of insecticides recommended for controlling Helicoverpa armigera (Hübner) and Spodoptera frugiperda (J. E. Smith) in Brazil which are considered key pests of several crop production systems. To implement insect resistance management programs, the objective of this research was to characterize the susceptibility to insect growth regulators in H. armigera and S. frugiperda populations from Brazil. Baseline susceptibilities of H. armigera to lufenuron and methoxifenozide and S. frugiperda to methoxifenozide were conducted with artificial diet overlay bioassays using 3 instar larvae. There was low variability in the susceptibility of H. armigera to lufenuron, with LD50 ranging from 0.30 to 1.02 μg of a.i./cm 2 of diet, and to methoxifenozide, with LD50 of 2.61 to 8.02 μg of a.i./cm 2 of diet across populations collected in different agricultural regions in 2013/2014 growing season. The diagnostic doses, based on DL99, were 6.36 μg of a.i./cm 2 of diet for lufenuron and 31.10 μg of a.i./cm of diet for methoxifenozide. Geographic and temporal variations in susceptibility to lufenuron and methoxifenozide were observed in populations of H. armigera collected from 2013/2014 to 2016/2017 growing seasons; however, it was not possible to isolate resistant strains to these insecticides using F2 screen and massal selection approaches. There was also a low variability in the susceptibility of S. frugiperda to methoxifenozide across populations collected in the 2 crop season in 2016, with LD50 ranging from 0.5 to 2.1 μg of a.i./cm 2 of diet. The diagnostic dose (DL99) for monitoring the susceptibility to methoxifenozide in S. frugiperda populations was 6 μg of a.i./cm of diet. In the 2 crop season of 2016, the survival at diagnostic dose of S. frugiperda populations evaluated was low (< 10%). On the other hand, in the 1 crop season of 2017, there was a significant increase in the survival across the populations tested, with values reaching up to 62% at diagnostic dose. The laboratory-selected resistant strain of S. frugiperda to methoxifenozide showed a low resistance ratio (5 times). We confirmed the high susceptibility of H. armigera to lufenuron and methoxifenozide and S. frugiperda to methoxifenozide in Brazil. The information collected in this study will be important for implementing a proactive resistance management programs to these insecticides. |
| File Format | PDF HTM / HTML |
| DOI | 10.11606/D.11.2017.tde-05102017-100113 |
| Alternate Webpage(s) | https://teses.usp.br/teses/disponiveis/11/11146/tde-05102017-100113/publico/Douglas_Amado_versao_revisada.pdf |
| Alternate Webpage(s) | https://doi.org/10.11606/D.11.2017.tde-05102017-100113 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
