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A bait and trap method for sampling symphylid populations in pineapple

Marie Alphonsine P.A., Fournier P., Dole B., Govindin J.C., Quénéhervé P., Soler A.. 2011. In : Abdullah Hassan (ed.), Bartholomew Duane P. (ed.), Latifah Mohd Nor (ed.). Proceedings of the Seventh international pineapple symposium, Johor Bahru, Johor, Malaysia, July 13-15, 2010. Louvain : ISHS [Belgique], p. 357-362. (Acta Horticulturae, 902). International Pineapple Symposium. 7, 2010-07-13/2010-07-15, Johor Bahru (Malaisie).

We developed a standardized method to monitor the symphylids (Hanseniella sp.) populations in pineapple using bait and traps. Two methods for symphylid extraction and enumeration were tested. Two statistical methods, the "variance/mean" ratio and a spatial analysis (Moran and Geary indices) were used to describe the type of spatial distribution of the populations. This bait and trap method allows a good evaluation of the symphylid populations. The ratio between adults and larvae may be used as an indicator of the population growth statute. Data collected on a rotation crop for pineapple, Mucuna pruriens var. utilis, showed that symphylids populations are highly aggregated following a negative binomial distribution. Finally, the method has been validated in plots of 'MD-2' pineapple to monitor the symphylids populations at different stages of development of the crop.
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