Reproductive behaviours and host plant selection mediated by semiochemicals in Neoleucinodes elegantalis (Lepidoptera: Crambidae) / Comportamento reprodutivo e seleção de hospedeiro mediada por semioquímicos em Neoleucinodes elegantalis (Lepidoptera: Crambidae)

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

27/07/2011

RESUMO

The searching behaviour in insects is important to acquire food, meeting mates, oviposition sites location and protect the insects against predators. Thus, the majority of herbivorous insects select their host plant and, in particular, the plants part, which it will feed and oviposit on, using, among other tools, host plants semiochemicals. This paper aims: (i) verify the role of host plant kairomones in calling and mating behaviours of N. elegantalis, (ii) investigate larval density effect on survivorship and larval development, (iii) investigate the role of chemical cues in general oviposition behaviour of N. elegantalis, (iv) Identify whether chemical cues are involved in discrimination by N. elegantalis females among different plant parts, (v) investigate whether chemicals extracted in hexane and ethanol solvents elicit different female oviposition responses, (vi) evaluate the behavioral response of N. elegantalis females to compounds emitted by tomato plants induced after herbivory. Some parameters of reproductive behavior have changed in the presence of kairomones of the host plant. The time spent calling as well as the mating duration, was lower in the presence of host-plant odors. Regarding the effect of larval density on the parameters of survival and development, pupae of lower weight were recorded in higher densities, as well as higher mortality rate of pupae and adults. The study of oviposition behavior mediated by chemical tools showed that when host plant volatile from flower, leaf and fruit are offered there is none oviposition preference, however in the presence of surface chemical compounds, females prefer to lay eggs on fruit extract compared with extracts of leaves and flowers of tomato. In addition, females recognize, through chemical cues, healthy fruits and fruit infested by larvae of conspecifics, and prefer to lay eggs on infested fruits.

ASSUNTO(S)

solanum lycopersicum cairomônios fitossanidade kairomones solanum lycopersicum

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