M.Sc. (Semester III) (CBCS) Examination Nov/Dec-2018
Agrochemicals and Pest Management
DISEASES OF CROP PLANTS I
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
Draw neat labeled diagram wherever necessary.
Figures to the right indicate full marks.
Q.1 Rewrite the sentences by choosing correct answer from given alternatives: 14
Exclusion of plant disease by legislation is known as
Disease résistance Plant quarantine
Biological control of plant Cultural control
First plant parasitic bacteria were reported by
Needham T. J. Burrill
Louis Pasteur Leeuwenhoek
Fungi which can grow only on living host plant are called
Obligate saprophytes Facultative parasites
Saprophytes Obligate parasites
Wilt of pigeon pea is caused by
Fusarium udum Gibberella indica
Rhizopus nigricans Aspergillus flavus
For the effective control of wilt, pigeon pea should be intercropped with
Maize Pearl millet
Sorghum Green gram
Phytopathology is the study of
Algae Fungi
Plant diseases Pteridophytes
The classification of the plant diseases is based mainly on
The structure of vegetative mycelium
The asexual stage
The sexual reproductive stage
None of these
The name 'smut diseases' is given to those produced by Ustilago because

Its mycelium is black in color
It parasitizes cereals
The host becomes completely black
The fungus produces black sooty spore masses
The rusts are caused by
Ustilaginales Peronosporales
Uredinales Erysiphales
10) When two host species are required for completion of parasitic fungi lifecycle,
this condition is described as
Autoecism Autotrophic
Heteroecism Heterokaryotic
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SLR-VA-13
11) Wilt of Peas, Beans caused due to fungus
Uncinula necator Alternaria alternata
Alternaria solani None of these
12) Downy mildews are caused by the members of
Erysiphales Taphrinales
Ustilaginales Peronosporales
13) Which of the following diseases is caused by a fungus
Cholera Rust of wheat
T.B. Tetanus
14) Rice blast pathogen perfect stage is
Pyricularia oryzae Magnaporthe grisea
Helminthosporium oryzae Rhizoctonia solani
Q.2 Answer the following any four:-
1. Write any two symptoms of Blast of Rice disease.
2. Write causal organisms of Rust and Smut disease of Maize.
3. What is mean by causal organism?
4. Write any two symptoms of French bean disease.
5. Write causal organism of Downey mildew and GSD disease of Sugarcane.
08
Write notes on any two
1. Nature of damage and management in rust of Cotton.
2. Disease cycle of soybean rust.
3. Symptoms of Rust disease in Sunflower.
06
Q.3 Answer the following. (Any Two)
1. Write the symptoms and disease cycle in Blast of rice.
2. Write the nature of damage and management in Seedling blight of
mustard.
3. Disease cycle and symptoms of Powdery mildew of Sunflower.
08
Answer the following. (Any One)
1. Comment up on Rust of Sorghum with respect to symptoms, disease cycle
its control measures.
2. Comment up on Rust of Chickpea with respect to symptoms, disease cycle
and its control measures.
06
Q.4 Answer the following. (Any Two)
1. Write the disease cycle and management in Rust of castor.
2. Enlist the symptoms of Ergot of Bajara.
3. Explain disease cycle in Anthracnose of Soybean.
10
Answer the following. (Any One)
1. Enlist the symptoms and control measures of Leaf spot of sesame.
2. Enlist the symptoms and control measures of Root rot of legume.
04
Q.5 Answer the following. (Any Two) 14
Give details of Udbatta disease of Rice; with respect to causal organism,
disease cycle, symptoms control measures.
Give details Red rot of sugarcane; with respect to causal organism, disease
cycle, symptoms control measures.
Give details of Shank rot of tobacco; with respect to causal organism, disease
cycle, symptoms control measure.