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Ecology and Epidemiology

Effect of Exchangeable Soil Aluminum and Alkaline Calcium Salts on the Pathogenicity and Growth of Phytophthora capsici from Green Pepper. J. J. Muchovej, Assistant professor, Departamento de Fitopatologia, Universidade Federal de Višosa, Višosa, 36 570, MG, Brazil; L. A. Maffia(2), and Rosa M. C. Muchovej(3). (2)Assistant professor, Departamento de Fitopatologia, Universidade Federal de Višosa, Višosa, 36 570, MG, Brazil; (3)Graduate student, Departamento de Solos, Universidade Federal de Višosa, Višosa, 36 570, MG, Brazil. Phytopathology 70:1212-1214. Accepted for publication 23 June 1980. Copyright 1980 The American Phytopathological Society. DOI: 10.1094/Phyto-70-1212.

In greenhouse studies CaCO3 or Ca(OH)2, but not CaSO4 or CaCl2 significantly increased seedling blight caused in green pepper by Phytophthora capsici. This enhancement of disease is attributed to immobilization of exchangeable soil aluminum by CaCO3 and Ca(OH)2, but not by CaSO4 or CaCl2. There was no relationship between tissue calcium 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.

Additional keywords: soil pH, soil fertility.