Effect of potting mix microbial carrying capacity on biological control of Rhizoctonia damping-off of radish and Rhizoctonia crown and root rot of poinsettia

ABSTRACT Potting mixes prepared with dark, highly decomposed Sphagnum peat, with light, less decomposed Sphagnum peat, or with composted pine bark, all three of which were colonized by indigenous microorganisms, failed to consistently suppress Rhizoctonia damping-off of radish or Rhizoctonia crown a...

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Bibliographic Details
Published in:Phytopathology 2001-11, Vol.91 (11), p.1116-1123
Main Authors: KRAUSE, Matthew S, MADDEN, Laurence V, HOITINK, Harry A. J
Format: Article
Language:English
Subjects:
Biological and medical sciences
Biological control
Control
Euphorbia pulcherrima
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Microbiology
Other methods
Phytopathology. Animal pests. Plant and forest protection
Raphanus sativus
Rhizoctonia
Trichoderma hamatum
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Summary:ABSTRACT Potting mixes prepared with dark, highly decomposed Sphagnum peat, with light, less decomposed Sphagnum peat, or with composted pine bark, all three of which were colonized by indigenous microorganisms, failed to consistently suppress Rhizoctonia damping-off of radish or Rhizoctonia crown and root rot of poinsettia. Inoculation of these mixes with Chryseobacterium gleum (C(299)R(2)) and Trichoderma hamatum 382 (T(382)) significantly reduced the severity of both diseases in the composted pine bark mix in which both biocontrol agents maintained high populations over 90 days. These microorganisms were less effective against damping-off in the light and dark peat mixes, respectively, in which populations of C(299)R(2) declined. In contrast, crown and root rot, a disease that is severe late in the crop, was suppressed in all three types of mixes. High populations of T(382) in all three mixes late during the cropping cycle may have contributed to control of this disease.
ISSN:0031-949X
1943-7684
DOI:10.1094/phyto.2001.91.11.1116