稻田周围植物上鳞翅目昆虫卵寄生蜂调查

本文报道稻田周围杂草上鳞翅目昆虫卵及其寄生蜂的种类。通过游草上鳞翅目昆虫卵寄生蜂发生动态的调查,初步明确了游草上鳞翅目昆虫卵及其寄生蜂种类大都与水稻相同,稻苞虫卵量尤多。是繁殖赤眼蜂的良好场所。赤眼蜂种群数量随寄主卵量而变化,其高峰期基本上与稻苞虫卵量一致或相差几天。7月初、10月和11月份赤眼蜂种群数量较多。还调查了稻田周围柑桔、白玉兰、香蕉和荸荠上部分鳞翅目害虫卵寄生蜂种类。这些害虫的卵上存在着与稻田相同的卵寄生蜂—拟澳洲赤眼蜂 Trichongrammaconfusum。不同生境香蕉弄蝶卵寄生蜂种类组成不同。

A Survey on the Egg Parasitoids of Lepidopterous Insects on Weeds and Others Around the Rice Field

The present paper gives a report on the species of lepidopterous eggs and their parasitoids on weeds and some other plants around the rice field.Particular attention had been paid to the fluctuation of abundance of eggs of skippers Parnara spp.and their parasitoids on cutgrass,Leersia japonica.The species of lepidopterous eggs and their parasitoids on cutgrass were mostly the same as those in the rice field.Several species of skip- pets of Parnara spp.had been found to lay a large number of eggs on the cutgrass.The population of Trichogramma spp.were rich on cutgrass and varied with the number of eggs of their hosts.The dates of high peaks of abundance for Trichogramma spp.were abundant in the early part of July,October and November.The species of egg parasitoids of some lepidopterous pests on citrus,yulan tree,banana and water chestnut were also observed.The population of a dominant parasitoid,Trichogramma confusum in the rice field were also rich on the above plants.The banana skipper(Erionota torus Evans (=E.thrax))eggs were heavily parasitized by Trichogramma confusum in the habitat near the rice field but not so in far distant places.