caa a22 4500 467929688 CHVBK 20180406152939.0 cr unu---uuuuu 170328e20060701xx s 000 0 eng 10.1007/s10658-006-9011-x doi (NATIONALLICENCE)springer-10.1007/s10658-006-9011-x Paecilomyces farinosus destroys powdery mildew colonies in detached leaf cultures but not on whole plants [Elektronische Daten] [Orsolya Szentiványi, Krisztina Varga, Rebecca Wyand, Hannah Slatter, Levente Kiss] Since 2001, several isolates of Blumeria graminis, the causal agent of cereal powdery mildew, maintained on detached leaves at the John Innes Centre, Norwich, UK, have spontaneously become infected with an unknown filamentous fungus whose mycelia have quickly overgrown the powdery mildew colonies and destroyed them completely. A total of five isolates of the contaminant were obtained and identified as Paecilomyces farinosus based on morphological characteristics and rDNA ITS sequence data. To determine whether these P. farinosus isolates can be considered as biocontrol agents (BCAs) of powdery mildews, we studied the interactions between P. farinosus and the following four powdery mildew species: B. graminis f.sp. hordei infecting barley, Oidium neolycopersici infecting tomato, Golovinomyces orontii infecting tobacco and Podosphaera fusca infecting cucumber. The powdery mildew colonies of all these four powdery mildew species were quickly destroyed by P. farinosus in leaf cultures but neither conidial suspensions nor cell-free culture filtrates of P. farinosus isolates could suppress the spread of powdery mildew infections on diseased barley, tomato, tobacco or cucumber plants in the greenhouse. It is concluded that P. farinosus cannot be considered as a promising BCA of powdery mildew infections although it can destroy powdery mildew colonies in detached leaf cultures and can be a menace during the maintenance of such cultures of cereal, apple, cucurbit and tomato powdery mildew isolates. Springer Science+Business Media, Inc., 2006 biocontrol nationallicence biological control nationallicence Blumeria graminis nationallicence cereal powdery mildew nationallicence detached leaf culture nationallicence fungal antagonist nationallicence Szentiványi Orsolya Plant Protection Institute of the Hungarian Academy of Sciences, P.O. Box 102, H-1525, Budapest, Hungary aut Varga Krisztina Central Service for Plant Protection and Soil Conservation, Budaörsi út 141-145, H-1118, Budapest, Hungary aut Wyand Rebecca John Innes Centre, Norwich Research Park, Colney, NR4 7UH, Norwich, UK aut Slatter Hannah John Innes Centre, Norwich Research Park, Colney, NR4 7UH, Norwich, UK aut Kiss Levente Plant Protection Institute of the Hungarian Academy of Sciences, P.O. Box 102, H-1525, Budapest, Hungary aut European Journal of Plant Pathology Kluwer Academic Publishers 115/3(2006-07-01), 351-356 0929-1873 115:3<351 2006 115 10658 https://doi.org/10.1007/s10658-006-9011-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10658-006-9011-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Szentiványi Orsolya Plant Protection Institute of the Hungarian Academy of Sciences, P.O. Box 102, H-1525, Budapest, Hungary aut NATIONALLICENCE 700 1- Varga Krisztina Central Service for Plant Protection and Soil Conservation, Budaörsi út 141-145, H-1118, Budapest, Hungary aut NATIONALLICENCE 700 1- Wyand Rebecca John Innes Centre, Norwich Research Park, Colney, NR4 7UH, Norwich, UK aut NATIONALLICENCE 700 1- Slatter Hannah John Innes Centre, Norwich Research Park, Colney, NR4 7UH, Norwich, UK aut NATIONALLICENCE 700 1- Kiss Levente Plant Protection Institute of the Hungarian Academy of Sciences, P.O. Box 102, H-1525, Budapest, Hungary aut NATIONALLICENCE 773 0- European Journal of Plant Pathology Kluwer Academic Publishers 115/3(2006-07-01), 351-356 0929-1873 115:3<351 2006 115 10658 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer