N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Botany, Part-I
PAPER-III
(Plant Pathology)
Annual Examination, 2016
Time 3 Hours. Full Marks 80
Answer any Five Questions. All questions carry equal marks.
1. Write short notes on any Four of the following
B. B. Mundkar Robert Koch
Inoculum potential Incubation and its significance
Isolation E. J. Butler.
2. What do you mean by toxin in relation to plant disease What are ultra structural changes
due to action of toxins in the host plant
3. What are Phytoalexins Describe different types of Phytoalexins and also discuss their
role in Host plant defencse.
4. What do you understand by the term resistance for a disease by plant Describe different
kinds of disease resistance found in the host plant.
5. Write short notes on any Four of the following
Eradication of alternate host Rouging
Mixed cropping Hot water treatment
Disease endurance Pre-disposing factors
6. Write short notes on the following
Soil amendment as a measure to reduce soil borne inoculums.
Crop rotation and control of soil-borne inoculums.
7. Give an account of Organic fungicides. What are qualities of good organic fungicides
8. What is rhizosphere micro flora Highlight important factors which supports the built up of
rhizosphere micro flora.
9. Write in short pathological notes on any Two of the following
Stem Rust of Wheat
Red Rot of Sugarcane
Late blight of Potato
Loose smut of wheat
10. Write short notes on any Two of the following
Etiology and Symptoms of Bunchy top of Banana
Hypertrophy and Hyperplasia
Etiology and symptom of die back of Chilli
Important diseases of Mustard with causal organism and relevant symptoms