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The capability of the predacious fungus Arthrobotrys oligospora (Hyphomycetales) to reduce numbers of infective larvae of Ostertagia ostertagi (Trichostrongylidae) in cow pats and herbage during the grazing season in Denmark

Published online by Cambridge University Press:  05 June 2009

J. Grønvold ,
P. Nansen ,
S. A. Henriksen ,
J. Thylin  and
J. Wolstrup
J. Grønvold
Affiliation:
Royal Veterinary and Agricultural University, Institute of Hygiene and Microbiology, 13, Bülowsvej, DK-1870 Frederiksberg C, Denmark
P. Nansen
Affiliation:
Royal Veterinary and Agricultural University, Institute of Hygiene and Microbiology, 13, Bülowsvej, DK-1870 Frederiksberg C, Denmark
S. A. Henriksen
Affiliation:
National Veterinary Laboratory, 27, Bülowsvej, DK-1870 Frederiksberg C, Denmark
J. Thylin
Affiliation:
Chr. Hansen's Bio Systems, 10–12, Bøge Alle, DK-2970 Hørsholm, Denmark
J. Wolstrup
Affiliation:
Royal Veterinary and Agricultural University, Department of Microbiology and Microbial Ecology, 21, Rolighedsvej, DK-1958 Frederiksberg C, Denmark
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Abstract

Artificially prepared cow pats containing Ostertagia ostertagi eggs were deposited on two pasture plots in May, June and July 1986. Half of the cow pats, placed on one plot, were inoculated with 2000 conidia per gram faeces of the predacious fungus Arthrobotrys oligospora. On the other plot fungus-free control cow pats were placed at the same time. In the faeces generally fewer infective O. ostertagi larvae developed in the inoculated than in the control cow pats. On the herbage around the control cow pats deposited in May, June and July a maxium concentration of infective larvae was found at the same time on the 6th of August 1986. At that time the herbage larval infectivity around inoculated cow pats deposited in May, June and July was subject to a reduction of 48%, 89% and 46%, respectively, compared with fungus-free control cow pats. This experiment indicates that a concentration of 2000 A. oligospora conidia per gram faeces results in a significant lowering of the herbage larval infectivity during the grazing season in Denmark.

Keywords

Ostertagia ostertagiTrichostrongylidaeArthrobotrys oligosporanematode-trapping fungicontrolcow patsecology
Type
Research Papers
Information
Journal of Helminthology , Volume 62 , Issue 4 , December 1988 , pp. 271 - 280
Copyright
Copyright © Cambridge University Press 1988

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References

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