The relation between cation-ratio and host-resistance to certain downy mildew and root-knot diseases
Article Received: 17 June 1983 Revised: 15 March 1984 Summary
The (Ca+Mg)/K ratio was found to have a relationship with the resistance of various crops to downy mildew and root-knot diseases. Predisposing factors such as host nutrition, prior infection by other pathogens and plant age changed (Ca+Mg)/K ratio. (Ca+Mg)/K ratio calculated from the published data of other workers also exhibited this relationship. It appears to play a role in several host-pathogen systems.
Key words Cation-ratio Disease Nutrition Sclerophthora rayssiae var. zeae Pseudoperonospora cubensis Peronospora parasitica Meloidogyne incognita References
Bains S S and Jhooty J S 1978 Increased susceptibility of virus infected
. Plant Dis. Reptr. 62, 1043–1046.
Bains S S and Jhooty J S 1978 Relationship between mineral nutrition of muskmelon and development of downy mildew caused by
. Plant and Soil 49, 85–90.
Bains S S and Jhooty J S 1979 Mixed infections by
inflorescences and their control. Indian Phytopath. 32, 268–271.
Balasubramanian K A 1975 Influence of nitrogen and phosphorus fertilizers on the expression of downy mildew of sorghum. Plant and Soil 43, 621–626.
Boning Karl 1976 Relations between nutriton and susceptibility to parasitic and nonparasitic diseases in plants. Plant Research and Development 4, 24–33.
Brown J W and Wadleigh C H 1975 Influence of sodium bicarbonate on the growth and chlorosis of garden beets. Bot. Gaz. 116, 201–209.
Chapman H D and Pratt D F 1961 Methods of Analysis for Soils, Plants and Water. Univ. Calif. Div. Agric. Sci. Berkely.
Dekock P C and Hall A 1955 The phosphorus-iron relationship in general chlorosis. Plant Physiol. 30, 293–295.
Jackson M L 1968 Soil Chemical Analysis. Asia Publishing House, Bombay.
Sherwood R T and Huisingh D 1970 Calcium nutrition and resistance of alfalfa to
. J. Nematology 2, 316.
U. S. Salinity staff 1954 Diagnosis and improvement of saline alkaline soil, USDA Handbook 60.
Wallace J Kuc and Draught H N 1962 Biochemical changes in the water insoluble material of maturing applefruit and their possible relationship to disease resistance. Phytopathology 52, 1023–1026.
Google Scholar Copyright information
© Martinus Nijhoff/Dr W. Junk Publishers 1984