DESCRIPTION OF COURSES

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PL PATH 512 ECOLOGY OF SOIL-BORNE PLANT PATHOGENS                                                                                  (2L+1) III

Objective
To impart knowledge on soil-plant disease relationship.

Theory

UNIT I
Soil as an environment for plant pathogens, nature and importance of rhizosphere and rhizoplane, host exudates, soil and root inhabiting fungi. Types of biocontrol agents.

UNIT II
Inoculum potential and density in relation to host and soil variables, competition, predation, antibiosis and fungistasis.

UNIT III
Suppressive soils, biological control- concepts and potentialities for managing soil borne pathogens.

Practicals
Quantification of rhizosphere and rhizoplane microflora with special emphasis on pathogens; pathogenicity test by soil and root inoculation techniques, correlation between inoculum density of test pathogens and disease incidence, demonstration of fungistasis in natural soils; suppression of test soil-borne pathogens by antagonistic microorganisms. Isolation and identification of different biocontrol agents.

Suggested Readings