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The antagonistic effect of thirteen Pseudomonas aeruginosa and thirteen strains of other Pseudomonas species was studied on the soil-borne phytopathogenic Rhizoctonia solani and Fusarium solani fungi.  The inhibition of pathogen colony growth was tested with two different in vitro techniques using the same type of culture media. In case of the spread slant technique the antagonists induced a significantly stronger inhibition on the growth of pathogens than in case of spot transfer. Among the 26 investigated Pseudomonas strains, P. aeruginosa strains were generally more effective against the fungal pathogens. Rhizoctonia solani proved to be affected to a greater extent by the bacterial strains studied than the Fusarium solani representative. The possibility of in vitro strain selection of biocontrol microbes is being further discussed .

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. Voisard , C. et al., 1994 . Biocontrol of root diseases by Pseudomonas fluorescens CHA0: Current concepts and experimental approaches . In: Molecular Ecology of Rhizosphere Microorganisms: Biotechnology and the Release of

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HIPPS , J. M. , 2004 . Prospects and limitations for mycorrhizas in biocontrol of root pathogens . Canadian Journal of Botany . 82 . ( 8 ) 1198 – 1227 . Z AIDI , A

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biocontrol agents on growth and aflatoxin production by Aspergillus flavus infecting rice grains . Food Control . 2009 ; 20 : 173 – 178 . 10.1016/j.foodcont.2008.03.009 . 9. Toda , S

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. E LAD , Y. , C HET , I. & K ATAN , J. , 1980 . Trichoderma harzianum: A biocontrol agent effective against Sclerotium rolfsii and Rhizocionia solani . Phytopathology . 70 . 119 – 121

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-pathogenic strains. The future perspective of these findings is the use of potential non-pathogenic strains of Listeria as biocontrol in the food industry. Therefore, biofilm formation of the pathogenic Listeria could be inhibited by the application of non

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. et al., 2002. Testing methods affecting the antagonistic ability of Pseudomonas biocontrol strains. Agrokémia és Talajtan. 51. 107–114. Kátai, J., 2006. Changes in soil characteristics in a mono- and

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. Kuhlmann , U. and Van Der Burgt , A.C.M . ( 1998 ). Possibilities for biological control of the western corn rootworm, Diabrotica virgifera virgifera LeConte, in Central Europe . Biocontrol News and Information , 19 : 59N – 68N . Leconte , J

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