[The biological activity of Ricinus communis on the housefly (Musca domestica)]. / Actividad biológica de Ricinus communis sobre mosca doméstica (Musca domestica).

The insecticide effect of a lectin obtained from Ricinus communis (castor-oil plant) on a population of houseflies from San José de Las Lajas was evaluated. Assays were performed with adults and larvae. Mortality was higher as the time f exposure to the extract increased DL50 was of 353.4 p.p.m. after 72 hours of exposure. It was observed a remarkedly significant reduction of the pupal development in the presence of the extract, which shows its insecticide activity.

[Mechanisms of resistance to organophosphate insecticides, carbamates, and pyrethroids in populations of Musca domestica L. (Diptera: Muscidae)]. / Mecanismos de resistencia a insecticidas organofosforados, carbamatos y piretroides en poblaciones de Musca domestica L. (Diptera: Muscidae).

Resistance to organophosphorus insecticides (malathion, chlorpyriphos, pyrimiphos-methyl); carbamates (propoxur); and pyrethroids (permethrin, deltametrine, cypermetrine, and lambda cialotrine) was studied in field populations of Musca domestica; results were compared with a susceptible reference strain. The method of topic application was employed in the bioassays; the synergist effect of the s,s,s tributyl phosphorotrioate and of the piperonyl butoxide (PB) was also tested. Biochemical microplate tests were also carried out to determine the presence of esterase and acetylcholinesterase enzymes in the three populations. Generalized resistance to malathion (FR = 264.6; 164.0; 154.7) was observed.