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Advisor(s)
Abstract(s)
The vine mealybug (VM), Planococcus ficus (Signoret), is a worldwide pest
and affects mainly grapevine and figs. In Israel, (S)-lavandulyl senecioate
[(S)-LS] and (S)-lavandulyl isovalerate [(S)-LI] were identified from
VM reared for several generations on potato sprouts, when compared
with the identification of only (S)-LS from feral females. Racemic lavandulyl
senecioate (LS) can be used for fieldwork because the unnatural
enantiomer is benign and does not affect the activity of the pheromone.
Lures loaded with 200 lg of LS remained active for 24 weeks but it is
recommended to replace lures after 12 weeks to preserve constant and
high attractiveness. Delta sticky traps, baited with 50 or 200 lg of LS
were used to determine the daily flight pattern and the seasonal flight
activity including vine plant infestation. A positive correlation between
peak mealybug density and male capture was observed strengthening
the usefulness of the pheromone traps for monitoring the pest. Addition
of racemic or the two enantiomers of lavandulyl isovalerate (LI) to LS
decreased the capture of VM males. The level of inhibition varied during
2003–2004. Both enantiomers of LI displayed the same antagonistic
activity. Addition of (S)-lavandulol to the pheromone resulted in shutdown
of the traps. Inhibition by the antipode, (R)-lavandulol, was moderate
indicating a certain degree of chiral discrimination
Description
Keywords
Planococcus ficus enantiomeric activity pheromone seasonal and daily flight
Pedagogical Context
Citation
"Journal of Applied Entomology". ISSN 0931-2084. 132 (2008) 480-489