Synomonal effect of nine varieties and one culture of rice on Trichogramma japonicum Ashmead and Trichogramma chilonis(Ishii) (Hymenoptera：Trichogrammatidae) 9个水稻栽培种和1个水稻组培种对稻螟赤眼蜂和赤眼卵蜂的互利作用.pdf

Abstract

Abstract：Bioassays of the hexane extracts of nine varieties v／z．。Pusa Sugandh-2，Pusa Basmati-1，Pusao 25 11．Pusa Basmati．370，Pusa．1077。Karnal I力cal，PRR-78，Jaya，Pusa一1238 and one culture of rice， Culture No．34 in vegetative and flowering phase were carried out in Petri dish。to observe their synomonal effect on mean parasitoid activity index(PAI)and mean percent parasitism by Trichogramma japonicum， Ashmead and Trichogramma chilonis(Ishii)．The hexane extracts of different rice varieties were subjected to gas liquid chromatography to determine the saturated hydrocarbons．Among these，leaf extracts from variety Pusa Sugandh．2 elicited maximum response in vegetative phase for both the parasitoids by way of mean percent parasitism．Whereas in flowering phase variet、，Pusa Basmati—l elicited maximum mean percent parasitism．Gas liquid chromatography of the leaf extracts from vegetative phase revealed that Pusa Sugandh-2 had two favorable hydrocarbons pentacosane(C，5)and nonacosane(C2q)．Gas liquid chromatography of leaf extract from flowering stage also revealed that Pusa Basmati一1 had three favorable hydrocarbons v／z．，pentacosane(C25)，hexacosane(C26)and nonacosane(C29)which could be ascribed to the highest response elicited by these varieties．