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Journal of Entomology

Year: 2004 | Volume: 1 | Issue: 1 | Page No.: 40-46
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Authors

N. Zouiten

A. Hilal

I. El Hadrami

Keywords

Research Article

3, 4-Dihydroxyphenylethanol, A Potential Repelling Compound Implicated in the Interaction of Olive Tree-Psyllid

N. Zouiten, A. Hilal and I. El Hadrami
Euphyllura olivina Costa (Psyllid) is a pest insect causing considerable wastes of crops by provoking the losses of young buds, flower buds and fruits in Olea europaea L. It seems that cultivars influence the oviposition performance of Psyllid. A certain degree of resistance to olive Psyllid in young and flower buds was associated with higher level of phenolic compounds and particularly the level of 3, 4-dihydroxyphenylethanol (3, 4-DHPE). In this study, analysis was performed on the evolution of the level of 3, 4-DHPE in young and flower buds infested or not by Psyllid and the effects of this compound on the oviposition performance and insect mortality on young buds as well as on their phenolic compounds. The infestation by Psyllid decreased the level of 3, 4-DHPE; this reduction is more pronounced in flower buds in comparison with the young buds (83.9 and 20%, respectively, after 30 days of treatment). The treatment with 3, 4-DHPE arrested the oviposition of Psyllid on young buds and induced a higher percentages of the insect mortality. No qualitative or quantitative changes of bud phenolics have been induced with 3, 4-DHPE treatment.
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