Análise faunística e flutuação populacional de cigarrinhas (Hemiptera: Cicadellidae) potenciais vetoras de Xylella fastidiosa em pomares de ameixeira nos estados do Rio Grande do Sul e São Paulo, Brasil / Faunistic analysis and seasonal fluctuation of sharpshooters (Hemiptera:Cicadellidae) that are potential vectors of Xylella fastidiosa in plum orchards in Rio Grande do Sul and São Paulo states, Brazil

AUTOR(ES)

Cristiane Muller

DATA DE PUBLICAÇÃO

2009

RESUMO

The plum leaf scald (PLF) is a major threat for plum production in Brazil. PLF is caused by the bacteria Xylella fastidiosa which is transmitted by sharpshooter leafhoppers (Hemiptera: Cicadellidae, Cicadellinae). In this investigation, we surveyed the Cicadellinae species associated with plum orchards located in Rio Grande do Sul (RS) and São Paulo (SP) states, Brazil, in order to identify potential vectors of X. fastidiosa in these regions. We also studied the seasonal fluctuation of predominant species determined by faunistic analysis. In each area, adult sharpshooters were sampled using yellow sticky cards (8,5 x 11,5 cm) in two orchards in Paranapanema (SP) and one in Bento Gonçalves and Farroupilha (RS), respectivelly. In all orchards, traps were spaced 35 m apart in 10 sample units. Vertical distribution was also evaluated by placing cards at 0.5 and 1.7 m above soil level in each sample unit. The survey was conducted during two years from September 2006 to September 2008, by removing sticky cards fortnightly. In plum orchards located in RS state, we collected a total of 1103 specimens of 27 sharpshooter species. Erythrogonia dorsalis (Signoret, 1853), Sibovia sagata (Signoret,1854), Spinagonalia rubrovittata Cavichioli, 2008, Macugonalia cavifrons Stål, 1862, Dilobopterus dispar (Germar, 1821), Bucephalogonia xanthophis (Berg, 1879) and Molomea lineiceps Young, 1968 were predominant in these orchards. We collected 293 individuals of 10 sharpshooter species in SP state, where Oncometopia facialis (Signoret, 1854) and Molomea consolida Schröder, 1959 were predominant. We found a lower diversity and abundance of Cicadellinae species in plum orchards located in SP when compared to RS state. The predominant species were more abundant from January to March in RS and, from October to January in SP, corresponding to plum harvest and pos-harvest periods in both regions. The lowest population of sharpshooters in plum orchards was observed during the plant dormancy period.

ASSUNTO(S)

bactérias fitopatogênicas cicadellinae ameixa cigarrinhas insect vectors xylella fastidiosa. insetos vetores. escaldadura da folha plum leaf scald seasonal fluctuation

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