Compatibilidade de Heterorhabditis amazonensis (Rhabditida: Heterorhabditidae) isolado RSC-5 com diferentes carrapaticidas utilizados no controle de Rhipicephalus microplus(Acari: Ixodidae)

• Autor(a) principal: Monteiro, Caio Márcio De Oliveira
• Data de Publicação: 2014
• Outros Autores: Matos, Renata Da Silva, Prata, Márcia Cristina De Azevedo, Batista, Elder Simões [UNESP], Perinotto, Wendell Marcelo De Souza, Bittencourt, Vânia Rita Elias Pinheiro, Furlong, John, Carvalho, Vanessa Andaló Mendes De
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S1808-16572014000100002; http://hdl.handle.net/11449/212026
• topic: entomopathogenic nematodes; biological control; cattle tick; nematoides entomopatogênicos; controle biológico; carrapato dos bovinos

The aim of this study was to assess the viability of Heterorhabditiamazonensis strain RSC-5 after exposure to different acaricides used for Rhipicephalumicroplucontrol. Six treatment groups were formed, one for each product. Each group was composed of 75,000 nematodes in a 20 mL solution of different acaricides, at commercial concentration. The control group was formed by the same number of nematodes in 20 mL of distilled water. All the groups were kept in a climate-controlled chamber at 25°C. The percentage of survival and infectivity in Galleria mellonella caterpillars were determined 24 and 72 hours after the beginning of the experiment. The mortality of the caterpillars in the infectivity test was assessed 72 and 120 hours. After 24 hours of exposure, only the active ingredient deltamethrin did not significantly reduce the survival percentage of H. amazonensis RSC-5 (p > 0.05). The same was observed after 72 hours of exposure to the combination of chlorpyriphos + cypermethrin + piperonyl butoxide + citronellal. There was no survival of infective juveniles in the groups exposed to the combination of chlorphenvinphos + dichlorvos. The exposure to chlorphenvinphos for 72 hours resulted in 50% of mortality. The potential to infect G. mellonella caterpillars was only reduced in the group treated with the active ingredient chlorphenvinphos. Chlorphenvinphos and the combination of chlorphenvinphos + dichlorvos were not compatible with H. amazonensiRSC-5, causing a reduction in the survival and infectivity of juveniles of this nematode, while the other products were compatible, causing no reduction in the infectivity of this isolate.