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Survey of Nematophagous Fungi in South Africa

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Survey of Nematophagous Fungi in South Africa Onderstepoort Journal of Veterinary Research, 72:185–187 (2005) RESEARCH COMMUNICATION Survey of nematophagous fungi in South Africa D.T. DURAND1*, H.M. BOSHOFF2, L.M. MICHAEL3 and R.C. KRECEK4 ABSTRACT DURAND, D.T., BOSHOFF, H.M., MICHAEL, L.M. & KRECEK, R.C. 2005. Survey of nematophagous fungi in South Africa. Onderstepoort Journal of Veterinary Research, 72:185–187 Three hundred and eighty-four samples of leaf litter, soil, faeces from domestic and game animals, compost and aqueous cultures of infective nematode larvae contaminated with unidentified fungi were plated out on water agar, baited with pure infective larvae of Haemonchus contortus, incubat- ed and examined for the presence of nematophagous fungi. Duddingtonia flagrans was isolated from five samples, and 73 samples were positive for other nem- atophagous fungi. Keywords: Arthrobotrys oligospora, Duddingtonia flagrans, Haemonchus contortus, nematophagous fungi INTRODUCTION ance of one such parasite, Haemonchus contortus, to anthelmintics in South Africa and other parts of Pastures are continually contaminated by the free- the world, led to the formulation of alternative living stages of various species of parasitic nema- strategies for its control. Among these was the use todes which infect domestic livestock. The resist- of nematophagous fungi such as Duddingtonia fla- grans for biological control of infective larvae on pastures. * Author to whom correspondence is to be directed Chlamydospores of D. flagrans, fed to livestock, 1 Department of Veterinary Tropical Diseases, Faculty of Vet- erinary Science, University of Pretoria, Private Bag X04, survive the digestive processes and are viable when Onderstepoort, 0110 South Africa voided in the faeces. Parts of the fungal mycelium 2 Department of Veterinary Tropical Diseases, Faculty of Vet- growing from germinating chlamydospores become erinary Science, University of Pretoria, Private Bag X04, modified to form three-dimensional adhesive nets Onderstepoort, 0110 South Africa. Present address: P.O. Box 81989, Doornpoort, 0017 South Africa which trap and then feed on nematode larvae. On 3 Division of Parasitology, Agricultural Research Council, contaminated pastures, D. flagrans has been shown Onderstepoort Veterinary Institute, Private Bag X05, Onder- to be effective in reducing the number of infective stepoort, 0110 South Africa. Present address: Bayer (Pty) larvae of H. contortus and Trichostrongylus colubri- Ltd, P.O. Box 143, Isando, 1600 South Africa formis from sheep, Ostertagia ostertagi from calves, 4 Department of Veterinary Tropical Diseases, Faculty of Vet- strongyles from horses, and Oesophagostomum erinary Science, University of Pretoria, Private Bag X04, Onderstepoort, 0110 South Africa. Present address: Depart- dentatum and Hyostrongylus rubidus from pigs ment of Zoology and Entomology, Faculty of Natural and (Larsen 2000). Agricultural Sciences, University of Pretoria, Pretoria, 0002 South Africa The aim of this study was to find a South African Accepted for publication 24 January 2005—Editor strain of D. flagrans adapted to local environmental 185 Nematophagous fungi in South Africa conditions that could be used in an integrated worm transferred by means of sterile glass inoculation control programme. In addition (although not the pri- needles to corn meal agar (Difco® Laboratories) mary aim), the occurrence of other nematophagous plates, to purify the isolate. fungi in the study area was also recorded. Pure cultures of six isolates of nematophagous fungi were sent to the “Centraalbureau voor Schim- MATERIALS AND METHODS melcultures” in the Netherlands for expert identifi- cation, to either confirm our findings or identify iso- The modified sprinkling technique of Larsen, Wol- lates that were problematic. strup, Henriksen, Dackman, Grønvold & Nansen (1991) was used for the isolation of nematophagous Conidia and chlamydospores of D. flagrans were fungi. Soil, faeces, leaf litter and compost samples prepared for SEM as follows: 1 cm square blocks of collected from five provinces in South Africa (Gau- corn meal agar cultures were vapour-fixed in osmi- teng, Mpumalanga, North West, Limpopo and Free um tetroxide for 12 h and air-dried for 2 days. The State) were sprinkled in a cross configuration on air-dried blocks were mounted on aluminium stubs, individual plates of 2 % water agar containing sputter coated with gold and viewed in a Philips XL 0.02 % tetracycline hydrochloride to suppress bac- 20 scanning electron microscope. terial growth. Approximately 3 ml of aqueous cul- tures of infective nematode larvae contaminated with unidentified fungi were pipetted onto the surface of RESULTS plates containing the same medium. The plates were Five isolates of D. flagrans and 73 isolates of other incubated at 26 °C, baited at least twice a week for nematophagous fungi were obtained from 384 cul- 3 weeks with approximately 3 500 infective H. con- tures of soil, faeces, compost, leaf litter and aque- tortus larvae from a pure aqueous culture and exam- ous suspensions of infective larvae contaminated ined for signs of nematophagous activity every 2–3 with unidentified fungi. The samples were collected days. The conidia and chlamydospores of some within a 500 km radius of Pretoria, South Africa. nematophagous isolates were photographed using The localities included agricultural land, bushveld, light microscopy or scanning electron microscopy urban gardens, nature reserves and a commercial (SEM). Others were measured and, in some cases, compost processing plant. drawn to facilitate identification. Identification was based on the descriptions of type strains (De Hoog The most common nematophagous fungus isolated 1985; Rubner 1996). The criteria included the type was Arthrobotrys oligospora. The other nemato- of structure used to trap larvae, the shape, size and phagous fungi isolated were Arthrobotrys superba, numbers of conidia, the configuration of the conid- Arthrobotrys dactyloides, Arthrobotrys botryospora, iophore, and the presence or absence of chlamy- Arthrobotrys scaphoides and Monacrosporium dospores in mature fungal cultures. Conidia grow- gephyropagum. Two isolates of D. flagrans were ing from trapped larvae on water agar plates were isolated from compost and three from leaf litter. FIG. 1 SEM of conidia from a South African isolate of Dudding- FIG. 2 SEM of a chlamydospore from a South African isolate of tonia flagrans Duddingtonia flagrans 186 D.T. DURAND et al. DISCUSSION ACKNOWLEDGEMENTS Twenty percent of the samples cultured were posi- The authors wish to thank the following people and tive for nematophagous fungi and D. flagrans has organizations: Dr Michael Larsen and Dr Kobus van for the first time been isolated in Africa. This pro- der Merwe for their help and encouragement, Ms D. vides the opportunity to compare the local fungus Josling for the SEM preparations and photographs, with strains from elsewhere in the world as regards Just Nature Organics, Onderstepoort and Mr Hans their efficacy in reducing infective parasitic larvae Heilgendorff of the National Botanical Gardens (Pre- on pastures. The doses of D. flagrans chlamydo- toria) for their cooperation, the Food and Agricultural spores required to significantly reduce the number Organization, U.N, Virbac RSA, and the Department of infective larvae contaminating pasture, are in the of Veterinary Tropical Diseases, Faculty of Veteri- order of 105–106 chlamydospores per kilogram nary Science, University of Pretoria, for financial body mass per day (Peña, Miller, Fontenot, Gilles- support. pie & Larsen 2002) and the residual effect is limited to 2 days (Waller, Knox & Faedo 2001). Locally iso- lated strains of D. flagrans would need to be cultured REFERENCES in bulk to obtain sufficient quantities of chlamydo- DE HOOG, G.S. (Ed.) 1985. Taxonomy of the Dactylaria com- spores for further studies under African conditions. plex, IV–VI. Studies in Mycology, 26:1–122. FAEDO, M. 2001. Growth, trapping and genetic diversity of Duddingtonia flagrans grows well on cereals and Duddingtonia flagrans—a biological control agent of free-liv- approximately 250 000 chlamydospores have been ing larval stages of ruminant parasitic nematodes. Ph.D the- counted on the surface of a single grain of barley sis, Danish Centre for Experimental Parasitology, The Royal Veterinary and Agricultural University, Denmark. (Grønvold, Wolstrup, Nansen, Henriksen, Larsen & GRØNVOLD, J., WOLSTRUP, J., NANSEN, P., HENRIKSEN, Bresciani 1993). S.A., LARSEN, M. & BRESCIANI, J. 1993. Biological control of nematode parasites in cattle with nematode-trapping It has been shown that there is very little genetic fungi: a survey of Danish studies.Veterinary Parasitology, variation in isolates of D. flagrans from Denmark, 48:311–325. the United Kingdom, France, Germany, the United LARSEN, M. 2000. Prospects for controlling animal parasitic States of America, Australia, Malaysia and India nematodes by predacious micro fungi. Parasitology, 120: 121– 131. (Faedo 2001). Faedo (2001) suggests that it is pos- LARSEN, M., WOLSTRUP, J., HENRIKSEN, S.A., DACKMAN, sible that D. flagrans from countries in Europe was C., GRØNVOLD, J. & NANSEN, P. 1991. In vitro stress introduced to Asia and Australia in exported live- selection of nematophagous fungi for biocontrol of parasitic stock. The South African strains of D. flagrans had nematodes in ruminants. Journal of Helminthology, 65:193– 200. not yet been isolated at the time of Faedo’s study but the same hypothesis applies. Chlamydospores PEÑA, M.T.,
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