Plant Health & Disease Diagnostics — DU B.Sc. (Hons.) Botany Previous Year Question Papers

4. Discuss in detail (any three) (5x3-15) (a) Serological and histochemical methods for disease diagnosis (b) History of Plant Pathology in India citing major contributions of any five plant`pathologists (c) Disease Forecasting, its tools and significance (d) Late blight of Potato 5. (i) Write in detail about the rust of wheat (ii) Write a note on classification of plant disease. (iii) Integrated Disease Management. (5) Scheme/Mode : NEP: UGCF-2022 2. Attempt four questions in all including Question 3. All parts of a question must be answered together. 5. Draw well-labelled diagrams and write the botanical name wherever necessary. 1. (i) Name the causal organisms for the following : (a) Angular Leaf Spot of Cotton (b) Early Blight of potato . (c) Yellow Stripe Rust of Wheat (d) Yellow Vein Mosaic of Bhindi (e) Loose Smut of Barley (ii) Define the following (any five) (a) Haustoria (c) Disease cycle (iii) Expand the following (any two) (a) GIS (iv) Fill in the blanks (any thi.ee) (1x.5=5) (a) When a rust fungi requires two hosts to complete its life cycle it is called as ........ (b) The al]ility of the pathogen to infect a host plant is called its .............. (c) The first fungicide used was ................... (d) The scient.ific study of spread and control of disease is. termed as 2. Draw neat and well-labelled diagrams for the following (any three) (5x3=15) (i) Disease cycle of Citrus Canker (ii) T.S. of crucifer leaf showing asexual stages of white rust (iv) TS through Aecial cups of Pwccz.7!z.cz 3. Write short notes on the following (any five) (a) Significance of plant diseases (b) Koch's postulates (c) Biological control of plant diseases (d) Disease Triangle (f) Cultural methods of disease control