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１９９１￣１９９３年室内试验结果证明：芜菁夜蛾线虫的３个品系Ｂｅｉｊｉｎｇ、Ｍｅｘｃｉａｎ、Ｏｔｉｏ对八字地老虎和小地老虎两种地下害虫的幼虫有很高的侵染力．用Ｂｅｉｊｉｎｇ品系线虫处理八字地老虎３龄幼虫，幼虫死亡率随线虫剂量而增加，当剂量为８０条线虫／八字地老虎幼虫时．死亡率可达９３％以上．每头３龄小地老虎幼虫用８０条该线虫处理的死亡率为８０％，用同一剂量的Ｍｅｘｉｃａｎ品系，八字地老虎和小地老虎的死亡率分别为８６．６％和８５．１％．Ｏｔｉｏ品系对两种幼虫的致死率达７０％￣８３．３％．ＮＣ３２品系对八字老虎毒力较差．即使剂量增至１６００条线虫／虫，八字地老虎的死亡率仅为４０％，表明不同品系线虫对害虫毒力差异较大．
From 1991 to 1993, the results of laboratory tests showed that the three strains of verrucose-mite nematode Beijing, Mexcian and Otio are highly invasive to larvae of two underground pests, namely, The 3rd instar larvae of the tiger were treated with Beijing lineage nematodes. The mortality of larvae increased with the nematode dose when the dose was 80 nematodes / eighty-year-old tiger larvae. Mortality rate of 93% or more. The mortality of 80 adult nematodes per 3-instar larvae was 80%. The mortality of 86.80% and 85. 1% of T. gigas and T. parrot were the same with the same dose of Mexican strain. Otio strains of the two larvae mortality rate of 70% ~ 83.3%. NC32 strains of the tiger Toxic Tiger worse. Even though the dose increased to 1600 nematodes / worms, the death rate was only 40% for the eight-digit tiger, indicating that there is a large difference in virulence among different strains of nematodes.