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Applied and Environmental Microbiology, July 2003, p. 4190-4191, Vol. 69, No. 7
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.7.4190-4191.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

A Selective Medium for Quantitative Reisolation of Trichoderma harzianum from Agaricus bisporus Compost

Josie Williams,1 John M. Clarkson,1,{dagger} Peter R. Mills,2 and Richard M. Cooper1*

Department of Biology and Biochemistry, University of Bath, Bath BA2 7AY,1 Department of Microbial Biotechnology, Horticultural Research International, Wellesbourne, Warwick CV35 9EF, United Kingdom2

Received 14 April 2003/ Accepted 17 April 2003

We adapted a selective medium, previously developed for reisolation of Trichoderma spp. from soil, for quantitative determination of growth of T. harzianum from commercial Agaricus bisporus composts. This medium enables comparisons of aggressive (sensu inhibition of A. bisporus yield) with nonaggressive T. harzianum groups. The resulting medium contains the antimicrobials chloramphenicol, streptomycin, quintozene, and propamocarb and was highly selective, allowing the recovery of T. harzianum, as viable conidia and hyphal fragments, in compact colonies with the absence of visible microbial contaminants.


* Corresponding author. Mailing address: Department of Biology and Biochemistry, University of Bath, Bath BA2 7AY, United Kingdom. Phone: 44 0 1225 383051. Fax: 44 0 1225 826779. Email: bssrmc{at}bath.ac.uk.

{dagger} Present address: Molecular Sensing plc, Melksham, Wiltshire SN12 8HL, United Kingdom.


Applied and Environmental Microbiology, July 2003, p. 4190-4191, Vol. 69, No. 7
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.7.4190-4191.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.