Chemical Nature And Persistence Of The Oviposition Deterring Pheromone In The Tracks Of The Larvae Of The Two Spot Ladybird, Adalia Bipunctata (Coleoptera : Coccinellidae)
[en] Aphidophagous ladybirds are reluctant to oviposit in patches of prey where conspecific larvae are present. This is adaptive as larval cannibalism is a major threat to egg survival. Ladybirds avoid laying eggs in such patches by responding to a species specific oviposition deterring pheromone present in the tracks of larvae. This study revealed that the oviposition deterring
pheromone consists of a mixture of alkanes of which n-pentacosane is the major component (15.1%). These alkanes are likely to spread easily on the hydrophobic cuticle of plants and so leave a large signal. In addition, they are not quickly oxidized and therefore provide a long lasting signal. The latter was confirmed by the observation that 10 day old tracks still deterred oviposition.
Disciplines :
Entomology & pest control
Author, co-author :
Hemptinne, Jl.
Lognay, Georges ; Université de Liège - ULiège > Gembloux Agro-Bio Tech
Doumbia, M.
Dixon, Afg.
Language :
English
Title :
Chemical Nature And Persistence Of The Oviposition Deterring Pheromone In The Tracks Of The Larvae Of The Two Spot Ladybird, Adalia Bipunctata (Coleoptera : Coccinellidae)
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