Both imidacloprid and S. carpocapsae in a chitosan formulation proved highly effective against R. ferrugineus in the field, and their efficacies did not significantly change when used in combination.
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The red palm weevil, Rhynchophorus ferrugineus (Olivier) (Coleoptera, Curculionidae), is an important pest of palms. It has recently colonized the Mediterranean Basin, where it is a serious problem on ornamental Phoenix canariensis (Chabaud) palms. The efficacy of Steinernema carpocapsae (Weiser) (Nematoda: Steinernematidae) in a chitosan formulation (Biorend R Ò ) against this weevil in a semi-field trial including both preventative and curative assays has been studied. Our results prove the potential of this nematode to control R. ferrugineus. Efficacies around 80% were obtained in the curative assay, and up to 98% in the preventative treatment. Applications repeated every 2-3 weeks during the critical flight periods could prove effective to protect palms from this weevil in the Mediterranean Basin.
h i g h l i g h t s Rhynchophorus species are polyphagous and some are pests of several palm species. We reviewed their natural enemies in both their native and introduced regions. More than 50 natural enemies have been reported to attack Rhynchophorus species. Fungi are the most promising ones for biological control.
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