No abstract

To determine the resistance of rubber tree clones (Hevea brasiliensis) to Leptopharsa heveae Drake and Poor (Heteroptera: Tingidae) a trial was held in Itiquira, MT, in 1994/95 by comparing the following clones: AVROS 2037, Fx 4037, GT 1, HARBEL, IAC 207, IAN 4493, IAN 717, IAN 873, RO 38, and RO 46. Free choice and no choice trials involving preference for oviposition and feeding were carried out under field and laboratory conditions. The symptoms caused by the insects, number of excrements, number of eggs/female/leaflet, mortality rate, and number of insects/leaflet were scored. The results showed that clones Fx 4037, RO 38 and RO 46 were resistant by nonpreference for feeding and oviposition, whereas GT and IAN 873 were the most susceptible.

Novos Registros de Fungos Patogênicos a Ácaros (Arachnida: Acari) no Brasil RESUMO -Relata-se o resultado de um inventário de patógenos de ácaros plantícolas e edáficos realizado através de um estudo da diversidade de ácaros de importância agrícola, principalmente no estado de São Paulo. Várias espécies de Eriophyoidea foram encontradas infectadas por espécies do fungo Hirsutella sp. Esporos de resistência de fungos Entomophthorales foram observados em ácaros das seguintes famílias: Ascidae, Phytoseiidae, Stigmaeidae, Tetranychidae e Tydeidae. Uma infecção do eriofiídeo Retracus johnstoni Keifer, associado à palmeira Syagrus romanzoffiana (Cham.) Glassman, por Cladosporium sp., também foi observada. Este fungo foi isolado e cultivado em meio artificial. Possíveis usos dos patógenos encontrados para fins de controle biológico são discutidos. PALAVRAS-CHAVE:Hirsutella, Cladosporium, Verticillium, Entomophthorales.ABSTRACT -During a study on the diversity of mites of agricultural importance, we made an inventory of pathogens infecting plant inhabiting and edaphic mites, mainly in the State of São Paulo, Brazil. Several species of Eriophyoidea were found to be infected by Hirsutella sp. Resting spores of Entomophthorales were observed in mites of the following families: Ascidae, Phytoseiidae, Stigmaeidae, Tetranychidae and Tydeidae. A Cladosporium sp. infection was noted in the eriophyid Retracus johnstoni Keifer, a pest of the palm tree Syagrus romanzoffiana (Cham.) Glassman. The fungus was isolated and cultured in artificial medium. The possible use of the observed pathogens for microbial control purposes is discussed.

No abstract