M.Sc. (A.G.P.M.) (Semester-IV) (CBCS) Examination, 2017
DISEASES OF CROP PLANTS II
Day Date: Wednesday, 26-04-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
N.B. Attempt totally five questions.
Section-I is compulsory.
Attempt any two questions from Section-II and any
two questions from Section -III.
Figures to the right indicate full marks.
SECTION I
Q.1 Rewrite the following sentences by choosing the correct
alternative.
14
Erysiphe causes the disease
Powdery mildews Downy mildews
Covered smut Late blight of potato
Macrocyclic rust is the name given to some fungi
Which produces bigger spores
Where all the five spore stages are produced
Which completes its life-cycle on a single host
Which selects many hosts to complete its life-cycle
White rust of crucifer is caused by
Puccinia Utilago Cystopus Peziza
Fungus Alternaria solani belongs to class
Ascomycetes Deuteromycetes
Schizomycetes Oomycetes
A haustorium of a fungus is meant for
Fixing up to the mycelium to the host
Increasing the spread of the disease
Reproduction of the fungus
Absorbing nourishment from the host
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
Page 1 of 3
Wilt disease of tomato is caused by
Aspergillus Puccinia
Cercospora Fusarium
The name 'smut diseases' is given to those produced by Ustilago
because
Its mycelium is black in colour
It parasitizes cereals
The host becomes completely black
The fungus produces black sooty spore masses
White rust of crucifers is a pseudo-rust because
The disease is not caused by basidiomycetours members
The colour of the pustule is t red
The disease is seen on crucifers
The disease is not seen on wheat
10) Anthracnose of mango is caused by
Pythium Alternaria
Collectotrichum Fusarium
11) Downy mildews are caused by the members of
Erysiphales Taphrinales
Ustilaginales Peronosporales
12) The rusts are caused by
Ustilaginales Peronosporales
Uredinales Erysiphales
13) Which of the following diseases is caused by a fungus
Cholera Rust of wheat
T. B. Tetanus
14) Phytopathology is the study of
Algae Fungi
Plant diseases Pteridophytes
SECTION-II
Q.2 Describe the biology, nature of damage and control measure of
powdery mildew of Bhendi.
07
Explain any two diseases in Chrysanthemum studied by you;
with respect to causal organism, symptoms control measures.
07
Q3 Comment up on following diseases with respect to causal
organism, symptoms control measures.
07
Powdery mildew of Sisso
Seeding blights of Lacuna
Explain leaf spot disease in Chilies; with respect to causal
organism, symptoms control measures.
07
Page 2 of 3
Q4 Give details of Brown rot (storage) disease of Pomegranate;
with respect to causal organism, disease cycle, symptoms
control measures.
07
Comment up on foliage disease and fruit storage disease of Ber. 07
SECTION III
Q5 Write down the nature of damage caused by 'black scurf of
tubers' disease of Potato.
05
Write down the symptoms and control measures of Downy
mildews.
05
Enlist any four diseases of vegetable crop along with their
causal organism.
04
Q6 Write down causal organism and symptoms of 'Leaf sport' in
sugar beet.
05
Write down causal organism and control measures of 'Asterina
disease' in Santalum.
05
Enlist any four diseases of ornamental plants along with their
causal organism.
04
Q7 Write down general symptoms of fungal diseases. 05
Write down symptoms of black spot diseases on Guava. 05
Enlist any four diseases of forest trees along with their causal
organism.