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Kairomonal response of the parasitoid Anagyrus spec. nov. near pseudococci to the sex pheromone of the vine mealybug
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Orientador(es)
Resumo(s)
The occurrence of a kairomonal response of the parasitoid
Anagyrus
spec. nov. near
pseudococci
(Hymenoptera: Encyrtidae) to (+)-(1
R,
3
R
)-
cis
-2,2-dimethyl-3-isopropenyl-cyclobutanemethanol
acetate (PcA, namely, planococcyl acetate) and (
S
)-(+)-lavandulyl senecioate (LS), the respective
female sex pheromones of its hosts, the citrus mealybug,
Planococcus citri
(Risso) and the vine mealybug,
Planococcus ficus
(Signoret) (Homoptera: Pseudococcidae) was investigated. Attraction to the
pheromones was tested by employing pheromone traps in field trials and by static air olfactometer
bioassays in the laboratory. Female wasps showed a significant response to LS, in both field and
olfactometer experiments. No significant response was registered to the sex pheromone of
P. citri.
Despite the similarity between the structures of LS and its analogue (
S
)
-
(+)-lavandulyl isovalerate
(LI), no significant response to the latter compound was observed. It seems that differences between
the structures of the carboxylate moiety of the respective molecules (LS and LI) markedly affect the
kairomonal attractiveness to the parasitoid. The kairomonal response of
Anagyrus
spec. nov. near
pseudococci
was neither influenced by the host habitat nor by the host species on which it developed. This suggested
innate behaviour of
Anagyrus
spec. nov. near
pseudococci
, possibly derived from evolutionary relationships
between the parasitoid and
P. ficus
. The practical implications of the results are discussed.
Descrição
Palavras-chave
host location chemical cue infochemical Hymenoptera Encyrtidae Planococcus citri Planococcus ficus citrus grapevine fig olfactometer pheromone trap
Contexto Educativo
Citação
"Entomologia Experimentalis et Applicata". ISSN 0013-8703. 126 (2008) 122-130
Editora
The Netherlands Entomological Society