Primeiro registro das espécies de cigarrinhas-da-raiz da cana-de-açúcar Mahanarva spectabilis (Distant) e Mahanarva liturata (Le Peletier & Serville) atacando canaviais na região de Goianésia (GO), Brasil / First record of the sugarcane froghoppers Mahanarva spectabilis (Distant) and Mahanarva liturata (Le Peletier & Serville) infesting sugarcane plantations in the region of Goianésia (GO), Brazil

As formas jovens da cigarrinha-da-raiz da cana-de-açúcar sugam as raízes, e os adultos sugam as folhas e injetam toxinas, causando necrose nos tecidos foliares. A espécie de cigarrinha mais citada em trabalhos científicos é a Mahanarva fimbriolata. Adultos de cigarrinha foram coletados em canaviais da Usina Jalles Machado, em Goianésia (GO). Estes foram montados, identificados e depositados na coleção da Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS). A identificação foi feita pela genitália. Constatou-se tratar de Mahanarva spectabilis e Mahanarva liturata, consistindo-se no primeiro registro das espécies de cigarrinhas-da-raiz atacando os canaviais em Goianésia; no local, pensava-se que existia somente a espécie M. fimbriolata.(AU)

The young forms of the sugarcane froghopper suck the roots, and the adults suck the sap from leaves and inject toxins, thus causing necrosis in leaf tissues. The most cited species of sugarcane froghopper in scientific papers is Mahanarva fimbriolata. Adults of the froghopper were collected in sugarcane plant Jalles Machado, in Goianésia (GO). These have been put together, identified and deposited in the collection of Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS). Identification was conducted by the genitalia. We found there were Mahanarva spectabilis and Mahanarva liturata, consisting of the first record of this species of froghopper attacking sugarcane fields in Goianésia; in this place, only the species M. fimbriolata was considered to exist.(AU)

Susceptibility of non-target invertebrates to Brazilian microbial pest control agents.

Microbial pest control agents or entomopathogens have been considered an interesting alternative to use instead of chemical insecticides. Knowledge of ecotoxicity data is very important to predict the hazard of any product released in the environment and subsidize the regulation of these products by governmental agencies. In the present study four new Brazilian strains of Bacillus and one fungus were tested to evaluate their acute toxicity to the microcrustacean Daphnia similis, the snail Biomphalaria glabrata and the dung beetle Digitonthophagus gazella. The microcrustaceans and the snails were exposed to entomopathogens in synthetic softwater and the beetles were exposed directly in cattle dung. Obtained data reveal low susceptibility of the non-target species to tested microorganisms, with lethal concentrations being observed only at much higher concentrations than that effective against target insects. These results show that the tested strains are selective in their action mode and seem to be non-hazardous to non-target species.