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研究了5种昆虫病原线虫在无寄主（大蜡螟）存在和有寄主存在条件下的垂直与水平扩散能力及寄主搜索能力，结果表明，在沙柱中H．bacteriophora，S．glaseriNc34品系，S．feltiaeOtio品系，H．zealandica及S．carpocapsaeA24品系5种昆虫病原线虫分别可垂直扩散最远至30，30，25，20，15cm处。S．feltiae每条线虫平均垂直扩散距离最远（10．11±0．15cmn＝2740），显著地大于S．carpocapsae（5．03±0．06cmn＝2303），H．zealandica（7．13±0．10cmn＝4947），H．bacteriophora（8．31±0．22cmn＝1975）而与S．glaseri（9．86±0．29cm n＝1781）无显著差别。在沙柱中水平扩散能力研究表明，3d内S．glaseai，S．feltiae，H．zealandica，H．bacteriophora，S．carpocapsae分别可扩散最远至30，20，20，15，10cm处，H．zealandica与H．bacteriophora间、H．bacteriophora与S．carpocapsae间平均每条线虫水平扩散距离差异不显著，而其余各种间差异显著。寄主大蜡螟存在的情况下，显著提高了S．feltiae，S．glaseri，H．bacteriophora，H．zealandica的垂直扩散能力，表明该4种昆虫病原线虫可主动寻找寄主，而S．carpocapsae缺乏主动寻找寄主能力。
The vertical and horizontal dispersal ability and host search ability of five species of entomopathogenic nematodes without host (wax wax borer) and host presence were studied. bacteriophora, S. glaseriNc34 strain, S. feltiaeOtio lines, H. zealandica and S. CarpocapsaeA24 strains of five kinds of insect pathogenic nematodes were vertically spread up to 30,30,25,20,15 cm. S. The average vertical spread of feltiae per worm was the farthest (10.11 ± 0.15cmn = 2740), significantly greater than S. carpocapsae (5.03 ± 0.06 cmn = 2303), H. zealandica (7.13 ± 0.10cmn = 4947), H. bacteriophora (8.31 ± 0.22cmn = 1975) glaseri (9.86 ± 0.29cm n = 1781) no significant difference. Studies on the ability of horizontal diffusion in sand column showed that within 3 days, glaseai, S. feltiae, H zealandica, H bacteriophora, S. carpocapsae respectively spread as far as 30,20,20,15,10 cm, H. zealandica and H. Between bacteriophora, H. bacteriophora and S. There was no significant difference in the average diffusion distance of each nematode between carpocapsae, while the others varied significantly. In the presence of the host waxworm, S. is significantly increased. feltiae, S. glaseri, H. bacteriophora, H. The vertical dispersal capacity of zealandica indicated that the four kinds of entomopathogenic nematodes could actively search for hosts, Carpocapsae lack the ability to actively look for host.