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榆兰叶甲啮小蜂(Tetrastichns sp.)属膜翅目(Hymenoptera)、姬小蜂科(Eulophidae),是榆兰叶甲〔Pyrrhalta(Galerucella)aenescens Fairm.〕卵的一种主要寄生蜂。榆兰叶甲广布于河北、河南、山东、山西、陕西、辽宁等省,近年来发生十分猖獗,严重影响榆树生长。尤其我省中部平原地区,榆树被食,片叶无存,群众不愿再种植。但我省南部地区由于啮小蜂的大量存在,此虫为害却不十分严重。1982年在我区发现此蜂,而且调查证实该蜂为控制榆兰叶甲大发生的主要天敌。为进一步繁殖和利用,我们对其生物学特性进行了初步研究,现报道如下。
The genus Tetrastichns sp. Belongs to Hymenoptera and Eulophidae and is a major parasitic wasp of the eggs of Pyrrhalta (Galerucella) aenescens Fairm. Elm leaf widely distributed in Hebei, Henan, Shandong, Shanxi, Shaanxi, Liaoning and other provinces, occurred very rampant in recent years, seriously affecting the elm growth. In particular, in the central plains of our province, the elms were eaten and the leaves were left blank, and the masses did not want to plant anymore. However, due to the large number of small bees in the southern part of our province, this pest is not very serious. The bee was found in our district in 1982, and the investigation confirmed that the bee was the main natural enemy that controls the leafhopper occurrence in the field. For further breeding and utilization, we conducted a preliminary study of its biological characteristics, are reported below.