Plant and Soil

, Volume 81, Issue 1, pp 69–74

The relation between cation-ratio and host-resistance to certain downy mildew and root-knot diseases


  • S. S. Bains
    • Department of Plant PathologyPunjab Agricultural University
  • J. S. Jhooty
    • Department of Plant PathologyPunjab Agricultural University
  • N. K. Sharma
    • Department of EntomologyHimachal Pradesh Agricultural University

DOI: 10.1007/BF02206895

Cite this article as:
Bains, S.S., Jhooty, J.S. & Sharma, N.K. Plant Soil (1984) 81: 69. doi:10.1007/BF02206895


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-ratioDiseaseNutritionSclerophthora rayssiae var.zeaePseudoperonospora cubensisPeronospora parasiticaMeloidogyne incognita

Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1984