Parasitism of the NematodeCriconemella xenoplaxby the FungusHirsutella rhossiliensis

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Abstract
H. rhossiliensis was commonly isolated from dead, surface-disinfested C. xenoplax extracted from peach orchard soils. Invasion of living nematodes followed attachment of spores to the nematode''s cuticle. After penetration of the cuticle directly beneath the adhering spore, a bulbous infection hypha formed from which secondary hyphae developed. Of the inoculated juveniles .apprx. 25% were penetrated and killed by the fungus under laboratory conditions; adult C. xenoplax were penetrated less often. Of the stressed adults .apprx. 50% (120 min incubation at 40.degree. C prior to inoculation) were invaded and killed by the fungus. H. rhossiliensis rapidly penetrated and colonized all adutls killed by 30 min of incubation at 60.degree. C prior to inoculation.

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