Affiliation:
1. 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.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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