HomeInternational Rice Research Notesvol. 31 no. 1 (2006)

Record of a hyperparasitoid on Pseudogonatopus nudus Perkins (Dryinidae: Chrysidoidea) parasitizing Nilaparvata lugens (Stål) from Asia

S. Manickavasagam | A. Prabhu | R. Kanagarajan

Discipline: Biology, Agriculture

 

Abstract:

Plant- and leafhoppers of rice are well-recognized noxious pests and severe populations have often caused serious rice yield losses. Many natural enemies are reported on these hoppers in rice. Among the parasitoids, mymarids and trichogrammatids are the most common. The rest of the parasitoids, dryinids, pipunculids, strepsipterans, and vellids, are unstable but still contribute to the biological management of hoppers. In a routine attempt to collect dryinids, parasitized brown planthopper (BPH) and green leafhopper (GLH) nymphs and adults showing the larval sac protrusion symptom were collected during the 2004 Kuruvai crop (July-Sep). They were transferred to potted plants under greenhouse conditions and reared till IRRN 31.1 25 the matured dryinid larvae came out and pupated on the surface of the culm region. Surprisingly, from a few pupae of dryinids, instead of dryinid adults emerging, other parasitoids came out. Later, these parasitoids were identified as Cheiloneurus exitiosus (Perkins) [Echthrogonatopus nigricornis(Hayat) is a synonym] belonging to the family Encyrtidae. It is a larval-pupal parasitoid. This hyperparasitoid on dryinid (Pseudogonatopus nudus) Perkins, seems to be the fi rst record from Asia.