Susceptibilidade do besouro rola-bosta africano a reguladores de crescimento de insetos / Susceptibility of African dung beetle to insect growth regulators

Verificou-se a ação dos reguladores de crescimento de insetos (IGR), diflubenzuron e methoprene, sobre o besouro rola-bosta africano, Digitonthophagus gazella (Fabricius), um inimigo natural da mosca-dos-chifres, Haematobia irritans irritans (Linnaeus). Casais de besouros foram colocados em baldes contendo terra úmida e alimentados com fezes bovinas contendo 1, 0,5 ou 0,2ppm de diflubenzuron e 0,2ppm de methoprene. Os insetos e sua prole foram recuperados com o auxílio de armadilhas pitfall. Diflubenzuron e methoprene não afetaram a sobrevivência dos adultos inicialmente expostos, mas interferiram na produção de descendentes. Diflubenzuron, nas concentrações de 1 e 0,5ppm, também afetou a duração do ciclo de vida dos besouros. Nenhum dos IGRs alterou a razão sexual dos descendentes obtidos. As concentrações testadas de diflubenzuron mostraram-se moderadamente nocivas ao besouro enquanto methoprene a 0,2ppm mostrou ser pouco nocivo, segundo os critérios da International Organization for Biological Control.

The effects of insect growth regulators (IGR), diflubenzuron and methoprene, on African dung beetle, Digitonthophagus gazella (Fabricius), a natural enemy of the horn fly, Haematobia irritans irritans (Linnaeus), was studied. Beetles were placed in buckets partially filled with humid soil and were fed bovine feces containing 1, 0.5, or 0.2ppm diflubenzuron and 0.2ppm methoprene. Insects and their progenies were recovered by pitfall traps. Diflubenzuron and methoprene did not affect the survival of the adults but reduced their progenies. Diflubenzuron 1 and 0.5ppm also affected the life cicle of the beetles. None of the IGR modified the gender ratio of the progenies. According to the IOBC criteria, diflubenzuron tested concentrations showed to be moderately harmful to the beetles, whereas methoprene 0.2ppm was slightly harmful.

Efecto de los inhibidores del desarrollo en insectos contra Culex quinquefasciatus (Diptera: Culicidae) / Effect to insect development inhibitors against Culex quinquefasciatus (Diptera: Culicidae)

Se realizó un estudio en condiciones de laboratorio donde se evaluó la efectividad de 2 reguladores del crecimiento de insectos, diflubenzuron y metopreno, contra larvas de Culex quinquefasciatus, un mosquito indicador de la presencia de aguas contaminadas, persistente picador nocturno en zonas urbanas y transmisor de filariasis humana. El diseño experimental contempló la realización de 3 bioensayos para cada cepa y producto, y la utilización de grupos controles y factores abióticos controlados. Los principales resultados mostraron que ambos productos fueron efectivos contra esta especie, destacándose el diflubenzuron por una mayor actividad biológica (p < 0,01). estos resultados posibilitan mejorar el saneamiento ambiental contra este mosquito mediante la inclusión de estos compuestos de programas de lucha integrada

Toxicity and effect of nicotine dust and methoprene on the fertility and fecundity of red cotton stainer dysdercus koenigii [fabr] [hemiptera: pyrrhocoridae] of KU strain

The adults of Dysdercus koenigii [Fabricius] were treated with different concentrations of nicotine dust and methoprene and the LD 50 was calculated as 60.00 micro g/adult and 6.8 micro g/adult, respectively and it was observed that methoprene has lesser LD50 as compared to nicotine dust but produces more abnormalities. It was also observed that both compounds increase the hatching period