Subterranean termites are an ancient group of social insects, broadly spread, known primarily as economically important pests for the destruction of wooden structures and also as agricultural pests. Many of the banned chlorinated hydrocarbon insecticides used to be recommended for the control of termites. Hence, it has become necessary to find alternative measures for termite control in the natural diverse habitats as well as in the cultivated soil to diminish use of these chemicals. Therefore, in the present study, 4 strains of entomopathogenic nematodes (EPN) belong to the genus Steinernema were assessed against Coptotermes heimi (Wasmann). These EPN included Steinernema pakistanense NNRC-AS.04, S. siamkayai NNRC-As.12, S. bifurcatum NNRC-As.65, and S. maqbooli NNRC-As.88. Virulence of all strains was determined at 3 different EPN inocula in plastic containers layered with sand. A significant nematode inoculum effect was detected for all the tested EPN species. NNRC-AS.04 and NNRC-As.65 showed the highest virulence effects of 95 and 100%, respectively at 150 IJs/ml.

中文翻译：

---

四种Steinernema物种作为控制白蚁Coptotermes heimi（Wasmann）（等翅目：犀牛科）的生物防治剂的毒力。

地下白蚁是一类古老的社会昆虫，广泛传播，主要被认为是破坏木结构的重要经济害虫，也被称为农业害虫。许多以前被推荐用于控制白蚁的被禁止的氯代烃杀虫剂。因此，有必要寻找替代措施以在自然多样的栖息地以及耕作的土壤中控制白蚁，以减少这些化学物质的使用。因此，在本研究中，针对Steinernema属的4株致病性线虫（EPN）菌株针对Coptotermes heimi（Wasmann）进行了评估。这些EPN包括Steinernema pakistanense NNRC-AS.04，S。siamkayai NNRC-As.12，S。bifurcatum NNRC-As.65和S. maqbooli NNRC-As.88。在3个不同的EPN接种物中，在铺有沙子的塑料容器中确定所有菌株的毒力。对于所有测试的EPN物种，均检测到明显的线虫接种效果。NNRC-AS.04和NNRC-As.65在150 IJs / ml时显示出最高的毒力效果，分别为95％和100％。