Effect of Exchangeable Soil Aluminum and Alkaline Calcium Salts on the Pathogenicity and Growth ofPhytophthora capsicifrom Green Pepper
- 31 December 1979
- journal article
- research article
- Published by Scientific Societies in Phytopathology®
- Vol. 70 (12) , 1212-1214
- https://doi.org/10.1094/phyto-70-1212
Abstract
In greenhouse studies CaCO3 or Ca(OH)2, but not CaSO4 or CaCl2 significantly increased seedling blight caused in green pepper by P. capsici. This enhancement of disease is attributed to immobilization of exchangeable soil Al by CaCO3 and Ca(OH)2, but not by CaSO4 or CaCl2. There was no relationship between tissue Ca and disease. In vitro reduction in mycelial growth occurred in culture media amended with Al+3 at levels corresponding to natural levels in soil. P. capsici was recovered from all soils indicating that suppression was fungistatic rather than fungitoxic.Keywords
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