Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

New record of a dipteran endoparasitoid of Cricula trifenestrata Helfer on Som, Machilus bombycina.

Abstract

A preliminary investigation was conducted in Arunachal Pradesh, India, from March to mid-September 2005 to study the larval and pupal parasitoid of Cricula trifenestrata to develop a strategic biological control programme for the future. A large number of cocoons of C. trifenestrata of several generations were collected from randomly selected branches of randomly selected Som (Machilus bombycina) plants. Exorista sorbillans has been identified as pupal parasitoid of this pest (parasitizing approximately 13-14% pupae). Higher parasitization was observed during summer. Adults of these parasitoids oviposited on C. trifenestrata in caterpillars; eggs hatched and took their nourishment from the caterpillar's body up to their emergence as adults. Although parasitization started at the larval stage of C. trifenestrata, the insect died at the pupal stage; hence, the parasitoid could be regarded as a pupal parasitoid. This is thought to be the first report from Arunachal Pradesh against this endoparasitoid infesting Cricula trifenestrata.