Relationships between inoculum density of Rhizoctonia solani, wirestem incidence and severity, and growth of cabbage

Rhizoctonia solani AG-4 was grown on cornmeal sand and added to nonsterile sandy loam soil at rates of 0, 0.5, 1.0, and 2.0% vol/vol. Ten 2-week-old seedlings of cabbage cv. Gourmet were transplanted individually into infested soil in cells of plug trays. Incidence and severity of wirestem increased...

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Bibliographic Details
Published in:Phytopathology 1995-12, Vol.85 (12), p.1487-1492
Main Author: Keinath, A.P. (Clemson University, Charleston, SC.)
Format: Article
Language:English
Subjects:
Biological and medical sciences
BRASSICA OLERACEA CAPITATA
CAROLINA DEL SUR
CAROLINE DU SUD
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
MORFOLOGIA FUNGICA
MORPHOLOGIE DE CHAMPIGNON
Pathology, epidemiology, host-fungus relationships. Damages, economic importance
PATOGENICIDAD
Phytopathology. Animal pests. Plant and forest protection
POUVOIR PATHOGENE
RHIZOCTONIA
RHIZOCTONIA SOLANI
VARIACION ESTACIONAL
VARIATION SAISONNIERE
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Summary:Rhizoctonia solani AG-4 was grown on cornmeal sand and added to nonsterile sandy loam soil at rates of 0, 0.5, 1.0, and 2.0% vol/vol. Ten 2-week-old seedlings of cabbage cv. Gourmet were transplanted individually into infested soil in cells of plug trays. Incidence and severity of wirestem increased nonlinearly (monomolecular model) and fresh plant weight decreased nonlinearly (exponential decay model) as the inoculum density was increased. Experiments to simulate cabbage seedbed conditions were conducted in nonsterile soil in flats in the greenhouse and in fumigated soil in the field. Sclerotia produced on autoclaved green beans were added to soil at 0, 1.25, 12.5, 125, and 1,250 sclerotia/kg. In two greenhouse trials, emergence was reduced significantly at the highest inoculum density. Both incidence of wirestem and area under the disease progress curve increased linearly with the base-ten logarithm of the inoculum density. In field trials in the spring and fall, emergence and plant fresh weight decreased quadratically and incidence of wirestem increased linearly with the base-ten logarithm of the inoculum density
ISSN:0031-949X
1943-7684
DOI:10.1094/Phyto-85-1487