RESUMO -O presente trabalho teve por objetivo identificar as espécies e flutuação populacional de cigarrinhas em viveiro cítrico localizado em Mogi-Guaçu -SP. O levantamento foi realizado em mudas cítricas da variedade 'Pêra', enxertada sobre limão-'Cravo', iniciando-se em março de 1997 e finalizando-se em março de 1998. Utilizaram-se armadilhas adesivas amarelas, num total de 48 em todo o viveiro e 5 na periferia da mata. A principal espécie capturada foi Bucephalogonia xanthophis. Observaram-se também as espécies Carneocephala sp., Dilobopterus costalimai, Ferrariana trivittata, Lebaja mediana, Macugonalia leucomelas, Plesiommata corniculata e Sonesimia grossa pertencentes à tribo Cicadellini, e Acrogonia sp., Dechacona missionum, Molomea cincta e Oncometopia facialis pertencentes à tribo Proconiini. Durante todo o período de avaliações, foram capturadas cigarrinhas no viveiro, com exceção da primeira quinzena de setembro. As espécies da tribo Cicadellini predominaram em relação às da tribo Proconiini. A tendência da população no outono foi crescente até meados desta estação e, posteriormente, decrescente. No inverno, foi decrescente, na primavera, crescente e, no verão, a população manteve-se estável. Termos de indexação:Citrus sinensis, Proconiini, Cicadellini, armadilha adesiva amarela. SPECIES AND POPULATION DYNAMICS OF SHARPSHOOTERS IN NURSERY CITRUS, LOCATED AT MOGI-GUAÇU, SPABSTRACT -This research was an attempt to identify sharpshooter species and their population dynamic in citrus nursery located at Mogi-Guaçú, SP. The survey was performed in nursery trees of 'Pera' sweet orange budded on 'Rangpur' lime, from March 1997 to March 1998. Yellow stick traps were used to collect insects on nursery (48 units) and on adjacent vegetation (5 units). The most prevalent species was Bucephalogonia xanthophis. It was also observed Carneocephala sp., Dilobopterus costalimai, Ferrariana trivittata, Lebaja mediana, Macugonalia leucomelas, Plesiommata corniculata and Sonesimia grossa, which belong to Cicadellini tribe, and Acrogonia sp., Dechacona missionum, Molomea cincta and Oncometopia facialis, belonging to Proconiini tribe. During the whole period of evaluation, the sharpshooters were collected on nursery, except on the first part of September. The Cicadellini species were prevalent in relation to Proconiini ones. There was a tendency of population increase on autumn. On winter the population decreased, on spring increased and on summer the population was stable.

The purpose of this research was to study the population fluctuation of sharpshooters in young citrus groves. The sharpshooters population was monitored using yellow stick traps. The most abundant species was Bucephalogonia xanthophis (Berg). Low populations of Acrogonia sp., Dilobopterus costalimai Young and Oncometopia facialis (Signoret) were detected throughout the trial.

Citrus Variegated Chlorosis (CVC) is an economically important, destructive disease in Brazil and is caused by Xylella fastidiosa and transmitted by sharpshooter insects. In this study, the efficacy of the fungus Metarhizium anisopliae in controlling the sharpshooter Oncometopia facialis was studied by bioassay conditions. In the bioassay, insects were sprayed with a suspension containing 5 X 10 7 conidia mL -1. Adults captured in the field were treated in groups of 10 in a total of 11 replications per treatment. Significant differences between the natural mortality and the mortality of insects treated with the fungus were observed 6 days after inoculations (P<0.05). These significant differences increased until 10 days after treatment. The fungus caused 87.1% mortality, with the LT50 varying from 5 to 6 days. The LC50 was 1.2 X 10 6 conidia mL -1 , varying from 7.7 X 10 5 to 2 X 10 6 conidia mL -1 . The results showed that the sharpshooter O. facialis was susceptible to the entomopathogenic action of M. anisopliae in controlled condition during bioassay.