PATH-232

PATH-232: PRINCIPLES OF PLANT PATHOLOGY

Credits: 2(1+1)

THEORY:
Terms and concepts, survival and dispersal or plant pathogens: Survival – mode of perpetuation of pathogen, facultatism by dormant mycelium and sclerotia; perpetuation on alternate and collateral hosts; heteroecism, autocism, polymorphism, physiological specialization, Dispersal: continuous dissemination – autonomous dissemination, Role of air, wind, water, animals, birds, insects, nematodes and mites in dissemination of plant pathogens, Discontinuous dissemination – man, seed, soil and agricultural operations, Phenomenon of infection: pre-penetration, penetration and post penetration, Mechanism of infection and avenues of penetration, direct and indirect penetration, Pathogenesis: role of enzymes, toxins, growth regulators and polysaccharides, Defense mechanisms in plant: structural and biochemical (pre and post infection), Plant disease epidemiology and disease forecasting: remote sensing, Epidemiology – Definition, simple interest and compound interest diseases, essential conditions for epiphytotics, decline of epidemics, Plant disease forecasting: methods of disease forecasting, survey and surveillance, forecasting models, satellite imaginary forecasting; General principles of plant disease management: importance, principles- avoidance, exclusion, eradication, protection and resistance.

PRACTICAL:
Study of different groups of fungicides and antibiotics, Preparation of fungicides: Bordeaux mixture, Bordeaux paste and chestnut compound, Methods of application of fungicides: seed, soil, and foliar, Bioassay of fungicides: poisoned food techniques; inhibition zone technique; slide germination technique, Biocontrol of plant pathogens: Dual culture technique, Detection of seed microflora, Seed treatment, Visit to quarantine station and remote sensing laboratory, Soil solarization, Handling of plant protection equipments.

Practical (Experiments):
1) Study of different groups of fungicides and antibiotics.
2) Preparation of fungicides: Bordeaux mixture, Bordeaux paste and chestnut compound.
3) Methods of application of fungicides: Seed, soil, and foliar.
4) Bioassay of fungicides: poisoned food techniques.
5) Inhibition zone technique.
6) Slide germination technique.
7) Biocontrol of plant pathogens.
8) Dual culture technique.
9) Detection of seed microflora.
10) Seed treatment.
11) Visit to quarantine station and remote sensing laboratory.
12) Soil solarization.
13) Handling of plant protection equipments.