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ISHS Acta Horticulturae 736: III International Date Palm Conference

OPTIMIZING TRAPPING OF PALM WEEVILS AND BEETLES

Author:   C. Oehlschlager
Keywords:   Oryctes rhinoceros, Rhynchophorus ferrugineus, Rhynchophorus palmarum, pheromone, kairomone
DOI:   10.17660/ActaHortic.2007.736.33
Abstract:
Oryctes rhinoceros is an economically important problem of young oil palm in South East Asia. The optimum trap for O. rhinoceros is a pheromone baited, elevated bucket trap containing vanes that protrude into the bucket. Trapping adults using 1 of these traps / 2 ha lowers damage by over 90% within a few weeks and is competitive with insecticide application. Rhynchophorus palmarum is most efficiently trapped using a small plastic container strapped to trees and baited with pheromone, ethyl acetate and food. In oil palm trapping R. palmarum at 1 trap / 5 ha lowers populations and associated damage by > 80% in one year. In coconut trapping of R. palmarum using one trap / ha lowers damage by > 80% over 1 year while in palmito palm the same trap will lower damage by 80% and increase yields by 58%. In the Middle East R. ferrugineus infestation of date palm is managed by periodic survey, treatment or removal of infested palms and trapping. There is strong evidence that trapping, in combination with spraying decreases infestation by 64% while smaller scale experiments indicate that trapping alone reduces infestation by 71%. Trapping is most efficient for all palm weevils if aggregation pheromone is combined with, ethyl acetate and moist. Trapping is made difficult by the requirement for replacement of water and food bait in traps. This paper reports that propylene glycol extends the effective life of trap food bait from 2 weeks to 7 weeks. This paper also describes a new natural food bait that is more effective than sugarcane in capture of R. palmarum in pheromone traps. Finally, tests of repellants that reduce captures of R. palmarum in pheromone traps by over 50% make possible push-pull strategies to improve management of palm weevils.

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