Distribution of some aphid parasitoids and suitability of two Aphidiinae (Hymenoptera) and Tagalina sp. (Dermaptera) as natural enemies of Pentalonia nigronervosa Coq. (Hemiptera:Aphididae)
2004
Lomerio, E.O.
Nineteen aphid species were collected from 64 plant species belonging to 30 families. Aphid parasitization in the field ranged from zero to 100% in La Trinidad, Laguna, Albay, Bulacan and Davao with the following ranges of climatic conditions: temperature, 17.25-29.20 deg C, rainfall 0.00-340.40 millimetersand relative humidity 68-89%. Three Aphidiinae genera viz., Trioxys, Aphidius and Diaeretus associated with Encyrtid, Syrphosphagus sp, an Aphelinid and Torymus sp were found attacking aphids. Five species of Trioxys, temporarily designated as sp. 1, 2, 3, 4, and 5 and two Aphidius sp. viz., A. absinthii Marshall and A. rosae Haliday were identified and characterized. Two predators, Episyrphus balteatus De Geer and Chrysoperla carnea Stephens were also noted. Two promising parasitoids, T. (Binodoxys) communis Gahan and Aphidius absinthii Haliday successfully parasitized P. nigronervosa in the laboratory and greenhouse. An earwig, Tagalina sp. voraciously preyed on P. nigronervosa. A parasitic nematode species was also trapped from soil samples by using P. nigronervosa. Macroclimatic factors influenced the occurrence of aphids. Incidence of virus disease is dependent on the population dynamics and response of P. nigronervosa to changes in macroclimatic factors. However, analysis of the linear relationship using t-test was insignificant.
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