Atividade inseticida do Spinosad sobre Alphitobius diaperinus em fezes de poedeiras comerciais naturalmente infestadas / Insecticidal activity of Spinosad against Alphitobius diaperinus in naturally infested excrements of commercial hens

RESUMO

Objetivou-se neste ensaio experimental avaliar a eficácia do Spinosad contra Alphitobius diaperinus desenvolvendo-se em fezes de galinhas poedeiras de ovos comerciais. Foi avaliada a presença de adultos e larvas de A. diaperinus, presentes no esterco localizado sob as gaiolas, nos dias 2 e 1, 1, 3, 6, 12, 19, 26, 33, 40, 47, 54 e 61 pós-tratamento. O Spinosad, na concentração de 250ppm, quando aplicado na dose de 0,126L/m2 mostrou-se ineficaz contra cascudinhos. As doses de 0,252L/m2 e de 0,504L/m2 (400ppm) mostraram-se igualmente eficazes contra adultos de cascudinhos até o 6ºDPT, atingindo percentuais de eficácia de 91,30% e 90,15%. Contra larvas de A. diaperinus, as diluições de 0,126L/m2 e de 0,252 L/m2 (Spinosad 400ppm) foram eficazes, respectivamente, até o 19ºDPT (96,71%) e 33ºDPT (85,70%). Período mais prolongado de eficácia contra A. diaperinus foi observado com Spinosad a 400ppm, na dose de 0,504L/m2 19DPT (89,55%) para adultos e 54DPT (92,72%) para larvas, demonstrando o período ativo deste tratamento, confirmando a hipótese de que o Spinosad apresenta potencial inseticida para controle de infestações de A. diaperinus infestando em fezes de poedeiras comerciais, representando uma alternativa para programas sanitários avícolas que utilizem a rotação de princípios ativos como forma de mitigar a seleção de resistência nas populações do coleóptero.

ABSTRACT

The objective of this experimental trial was to evaluate the efficacy of Spinosad against Alphitobius diaperinus developing in feces from laying hens of commercial eggs. The presence of adults and larvae of A. diaperinus, present in the manure located under the cages, on days –2 and –1, 1, 3, 6, 12, 19, 26, 33, 40, 47, 54 and 61 was evaluated after treatment. Spinosad, at a concentration of 250ppm, when applied at a dose of 0.126L / m2 was shown to be ineffective against “lesser mealworm”. The doses of 0.252L / m2 and 0.504L / m2 (400ppm) proved to be equally effective against adults of strawberries up to the 6th PDT, reaching efficacy percentages of 91.30% and 90.15%. Against A. diaperinus larvae, the dilutions of 0.126 L / m2 and 0.252 L / m2 (Spinosad - 400ppm) were effective, respectively, up to 19ºDPT (96.71%) and 33ºDPT (85.70%). The longest period of effectiveness against A. diaperinus was observed with Spinosad at 400ppm, at a dose of 0.504L / m2 19DPT (89.55%) for adults and 54DPT (92.72%) for larvae, demonstrating the active period of this treatment, confirming the hypothesis that Spinosad has potential insecticide to control infestations of A. diaperinus infesting in commercial laying faeces, representing an alternative for poultry health programs that use the rotation of active ingredients as a way to mitigate the selection of resistance in populations of the coleoptera.