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Influence of nematophagous fungi, earthworms and dung burial on development of the free-living stages of Ostertagia (Teladorsagia) circumcincta in New Zealand.
- Source :
-
Veterinary parasitology [Vet Parasitol] 2002 Mar 01; Vol. 104 (2), pp. 119-29. - Publication Year :
- 2002
-
Abstract
- Biological options for nematode parasite control are being sought, as the long-term efficacy of conventional anthelmintics comes increasingly under threat from drug-resistant parasites. Three biological methods with the potential to reduce pasture contamination by parasitic nematode larvae were examined: (a) killing of larvae developing in dung by nematophagous fungi; (b) removal of dung through earthworm ingestion; (c) burial of dung in soil as might occur through the action of dung beetles. Field trials with the test bio-control agents were carried out in autumn and spring by adding dung from sheep infected with Ostertagia (Teladorsagia) circumcincta to pots of ryegrass/white clover. The factorial treatment structure included five fungal treatments (individual applications of Duddingtonia flagrans, Monacrosporium gephyropagum and Harposporium helicoides, a combination of all the three fungi together and an untreated control), two dung burial treatments (dung buried or deposited on the soil surface) and two earthworm treatments (earthworms present or absent). D. flagrans and H. helicoides, individually or in combination, reduced recovery of infective stage larvae in experiment 1, while only H. helicoides reduced recovery in experiment 2. In both the experiments, dung burial increased the total number of larvae recovered, while the number of infective larvae were reduced by the action of earthworms. Increased recovery following burial, along with the fact that larvae moved rapidly from soil onto herbage, suggests that soil may provide a protective reservoir for infective larvae infesting herbage.
- Subjects :
- Animals
Feces parasitology
Larva
Mitosporic Fungi growth & development
Nematode Infections prevention & control
Nematode Infections veterinary
New Zealand
Oligochaeta growth & development
Ostertagiasis prevention & control
Pest Control, Biological
Sheep
Sheep Diseases parasitology
Sheep Diseases prevention & control
Mitosporic Fungi physiology
Oligochaeta physiology
Ostertagia growth & development
Ostertagiasis veterinary
Subjects
Details
- Language :
- English
- ISSN :
- 0304-4017
- Volume :
- 104
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Veterinary parasitology
- Publication Type :
- Academic Journal
- Accession number :
- 11809331
- Full Text :
- https://doi.org/10.1016/s0304-4017(01)00629-x