Field parasitism of Marietta carnesi (Howard) (Hymenoptera:Aphelinidae) on Comperiella calauanica Barrion et al. (Hymenoptera:Encyrtidae) in Orani, Bataan, Philippines
2019
Amarinez, B.J.M. | Arce, S.N.S. | Busmente, E.A.B. | Labios, M.E.P. | Amalin, D.M.
Comperiella calauanica Barrion et al. is a native, highly specific encrytid endoparasitoid that is effective and efficient against the coconut scale insect, Aspidiotus rigidus Reyne. The aphelinid Marietta carnesi (Howard) and its hyperparasitism on C. calauanica has been reported earlier. So far, M. carnesi has been the only confirmed natural enemy of the aforementioned encrytid in the field. The hyperparasitism of M. carnesi on C. calauanica is here reported from samples collected in Orani, Bataan. Very low degrees of hyperparasitism were observed, with mean average values of 3.66%, 2.10%, and 1.70% recorded for three sampling periods. Correlation and regression analyses on the number of hyperparasitized scales against the number of parasitized scales seem to show a much lower degree of host density-dependence of hyperparasitism of M. carnesi compared to primary parasitism of C. calauanica on A. rigidus. These findings appear to strongly support the view that the occurrence of M. carnesi as hyperparasitoid would not have much implication on the efficacy of C. calauanica as biological control agent of A. rigidus.
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