M.Sc. (Semester IV) (CBCS) Examination Nov/Dec-2018
Agrochemicals and Pest Management
DISEASES OF CROP PLANTS II
Time: 2½ Hours Max. Marks: 70
Instructions: Attempt totally five questions.
Question no. 1 is compulsory (Section I).
Attempt any two questions from question no. 2 to 4 (section-II).
Attempt any two questions from question no. 5 to 7 (section-III).
Figures to the right indicate full marks.
SECTION I
Q.1 Rewrite the sentences by choosing correct answer from given alternatives: 14
White rust of crucifer is caused by
Puccinia Utilago
Cystopus Peziza
Erysiphe causes the disease
Powdery mildews Downy mildews
Covered smut Late blight of potato
Wilt disease of tomato is caused by
Aspergillus Puccinia
Cercospora Fusarium
White rust of crucifers is a pseudo-rust because
The disease is not caused by basidiomycetous members
The color of the pustule is not red
The disease is seen on crucifers
The disease is not seen on wheat
Downy mildews are caused by the members of
Erysiphales Taphrinales
Ustilaginales Peronosporales
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 it life-cycle
Fungus Alternaria solani belongs to class
Ascomycetes Deuteromycetes
Schizomycetes Oomycetes
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
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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.
10) Anthracnose of mango is caused by
Pythium Alternaria
Colletotrichum Fusarium
11) The rusts are caused by
Ustilaginales Peronosporales
Uredinales Erysiphales
12) Phytopathology is the study of
Algae Only fungi
Plant diseases Pteridophytes
13) Alternaria solani causes
Late blight of potato Wart of potato
Early blight of potato Leaf curl of potato
14) When two host species are required for completion of parasitic fungi lifecycle,
this condition is described as
Autoecism Autotrophic
Heteroecism Heterokaryotic
SECTION II
Q.2 Describe the biology, nature of damage and control measure of downy mildew
of peas.
Explain any two diseases in Rose studies by you; with respect to causal
organism, symptoms control measures.
07
07
Q.3 Comment up on following diseases with respect to causal organism
symptoms:-
Powdery mildew of Sisso
Seedling blights of Lacuna
Explain leaf spot disease in Chilies; with respect to causal organism,
symptoms control measures.
07
07
Q.4 Give detail of Brown rot (storage) disease of Pomegranate; with respect to
causal organism, disease cycle, symptoms control measures.
Comment up on foliage disease and fruit storage disease of Ber.
07
07
SECTION III
Q.5 Write down the causal organism and symptoms of powdery mildews of chilies. 05
Write down the causal organism and disease cycle of dry rot of sweet potato. 05
Write down the control measures of orange rot. 04
Q.6 Write down the causal organism and symptoms of Anthracnose of Grapes. 05
Write down the causal organism and disease cycle of fruit root of mango. 05
Write down the symptoms of leaf spots of banana 04
Q.7 Write down the causal organism and symptoms of flower blights of Gladiolus. 05
Write down the causal organism and disease cycle of star spot disease of
Bamboo.
05
Write down the control measure of Asterina disease of Santalum 04