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Appl Environ Microbiol. 1994 August; 60(8): 2852-2857
Copyright © 1994, American Society for Microbiology. All Rights Reserved.

Effect of Population Dynamics of Pseudomonas cepacia and Paecilomyces lilacinus on Colonization of Polyfoam Rooting Cubes by Rhizoctonia solani

D. Kelly Cartwright* and D. M. Benson

Department of Plant Pathology, North Carolina State University, Raleigh, North Carolina 27695

ABSTRACT

Suspensions of Pseudomonas cepacia (strain 5.5B) and Paecilomyces lilacinus (isolate 6.2F) were applied to polyfoam rooting cubes for control of stem rot of poinsettia caused by Rhizoctonia solani. The populations of antagonists and colonization of rooting cubes by R. solani were monitored during a 3-week period. Colonization of cubes by R. solani was reduced in cubes treated with P. cepacia, but the population of P. cepacia decreased by as much as 97% during the test period. Increased colonization by R. solani was correlated with a decline in population of P. cepacia. P. lilacinus was more persistent than P. cepacia in cubes, with only a 21% reduction observed during the 3-week period. Colonization of the P. lilacinus-treated cubes by R. solani was significantly less than colonization of infested controls. No correlation existed between population of P. lilacinus and colonization of cubes by R. solani.

FOOTNOTES

* Corresponding author. Mailing address: Crops Research Laboratory, USDA/ARS/SAA, Oxford, NC 27565. Phone: (919) 693-5151, ext. 229. Fax: (919) 693-3870. Electronic mail address: Kelly Cartwright@ncsu.edu.

Appl Environ Microbiol. 1994 August; 60(8): 2852-2857
Copyright © 1994, American Society for Microbiology. All Rights Reserved.





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Copyright © 1994 by the American Society for Microbiology. All rights reserved.