AVALIAÇÃO DA ATRAÇÃO DE <em>Phyllocnistis citrella</em> (LEPIDOPTERA, GRACILLARIIDAE) A (Z,Z) E (Z,E)-7,11-HEXADECADIENAL EM POMARES DE CITROS NO BRASIL

Abstract

A atração do “minador-dos-citros” Phyllocnistis citrella Stainton, 1856 (Lepidoptera, Gracillariidae) ao composto (Z,Z)-7,11-hexadecadienal e ao seu isômero (Z,E)-7,11-hexadecadienal foi investigada em pomares de citros nas regiões de Casa Branca/SP e Taquarí/RS, Brasil. Os experimentos foram realizados utilizando-se armadilhas adesivas tipo Delta contendo fêmeas virgens ou septos de borracha com compostos feromonais sintéticos. No município de Casa Branca testou-se a atratividade de P. citrella a diferentes quantidades de (Z,Z)-7,11-hexadecadienal (1, 100 e 1000 mg/septo). No município de Taquari, avaliou-se a atratividade do minador ao (Z,Z) e (Z,E)-7,11-hexadecadienal na mesma quantidade (100 mg/septo). Os septos mais atraentes foram os de 100 mg, no entanto, a atratividade do “minador-doscitros” aos isômeros testados foi baixa, não diferindo significativamente. No município de Casa Branca, (Z,Z)-7,11-hexadecadienal foi responsável pela atração de 3,23% dos insetos capturados, em contraste com as armadilhas com fêmeas virgens, as quais capturaram 96,77%. Em Taquari, as percentagens de captura com os aldeídos (Z,Z) e (Z,E)-7,11-hexadecadienal não diferiram estatisticamente, com valores de 10,86 e 8,23%, respectivamente, contudo, houve uma diferença significativa de capturas nestes tratamentos em relação as armadilhas controle (0,63%). As implicações destes resultados na comunicação química de P. citrella são discutidas.
Palavras-chave: minador-dos-citros, Citrus sp., atrativo químico, armadilha.

ABSTRACT
Evaluation of Phyllocnistis citrella Stainton (Lepidoptera, Gracillariidae) attraction to (Z,Z) and (Z,E)-7,11-hexadecadienal in citrus orchards in Brazil
The attraction of the citrus leafminer, Phyllocnistis citrella Stainton, 1856 to sources of the synthetic aldehyde component (Z,Z)-7,11-hexadecadienal and its isomer, (Z,E)-7,11-hexadecadienal, was investigated in two field experiments in citrus groves orchards in Casa Branca/SP and Taquarí/RS, Brazil. The experiments were conducted in Delta traps with virgins’ females and treated rubber septum. In Casa Branca, the leafminer attractiveness was tested with different amount of (Z,Z)-7,11-hexadecadienal (1, 100 and 1000 mg/septum). In Taquarí, de P. citrella attractiveness was evaluated with both isomers in the same amount (100 mg/septum). Traps baited with 100 mg were the most attractive, however, the leafminer attractiveness to both isomers was low, with no significance difference. Citrus leaf miners were low attracted to (Z,Z) and (Z,E)-7,11-hexadecadienal. In Casa Branca (Z,Z)-7,11-hexadecadienal was responsible for attractiveness of 3.23% of all captured insects, in contrast to traps with virgin females (96,77%). In Taquari, the percentages of (Z,Z) and (Z,E)-7,11-hexadecadienal captures were not statistically different, with values of 10,86 and 8,23%, respectively. However, there was a significant difference of captures with baited traps comparing to control traps (0,63%). The results implications in the chemical communication of P. citrella are discussed.
Key words: leafminer, citrus, chemical attractant, trap.