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| Author(s): | Hui E., Webster J.M. |
| Year: | 1998 |
| Title: | The host-finding ability of Steinernema feltiae in the presence of insect larvae and plant root cues |
| Citation: | Journal of Nematology. 30:(4) 500-501. Abstract of the Society of Nematology 1998 Annual Meeting. |
Abstract:
Xenorhabdus and Photorhabdus, the bacterial symbionts of Steinernema spp. and Heterorhabditis spp., respectively, grow rapidly in the insect's hemocoel and provide nutrients in the dying and dead insect for nematode development. The integument-enclosed cadaver contains a highly nutritious medium that enables exceptional multiplication of the nematodes. Among, the secondary metabolites of the bacteria in culture are three nematicidal substances: ammonia, 3,5-dihydroxy-4- isopropyistilbene (ST), and a heterocyclic substance (HD). ST, at 100 g/ml in an immersion test, caused almost 100% mortality of Aphelenchoides rhyntium, Bursaphelenchus xylophilus, and Caenorhabditis elegans but had no effect on juveniles of Meloidogyne incognita and H. megidis. HD caused mortality of B. xylophilus and M. incognita at 250-500 g/ml, but only paralysis at lower concentrations. ST was present after 24 hours in nematode-infected Galleria mellonella larval cadavers at concentrations as high as 3,000g/g wet larval tissue. However, HD was not detectable in nematode-infected G. mellonella larvae |
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