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Publicação
Efeito de factores de natureza visual na localização de fontes de feromona pelos machos de cochonilha-algodão dos citrinos, Planococcus citri (Risso)
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Orientador(es)
Resumo(s)
This work is part of the Project POCI/AGR/57580/2004 and was aimed at studying the
influence of visual cues (colour and silhouette) in short-range attraction of the adult males of
the citrus mealybug, Planococcus citri (Risso), in response to a pheromone source, and
characterizing the internal morphology of its three pairs of simple eyes.
Colour preference was tested in field (with chemical stimuli) and laboratory (without
chemical stimuli), using four coloured sticky traps – white, green, yellow and red. The study
of the internal morphology of the eyes was carried out using Transmission Electron
Microscopy (TEM).
The attraction of mealybug males to red traps was significantly higher than to green and
yellow traps. Apparently, they were not able to distinguish trap silhouettes. The three pairs of
eyes have great resemblance with typical dorsal eyes. The characteristics of ventral eyes
suggest a higher light sensibility and a better resolution, relatively to the dorsal and lateral
pairs. The possible sensitivity of P. citri males to ultraviolet wavelengths and/or polarized
light is discussed.
The results suggest that the visual cues may be used to improve the effectiveness of
pheromone-based management tactics for pest mealybugs.
Descrição
Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia
Palavras-chave
citrus planococcus citri mealybugs colour traps pheromone insect vision cochonilhas feromona visão dos insectos