M.Sc. (Semester IV) (CBCS) Examination Oct/Nov-2017
Agrochemicals And Pest Management
DISEASES OF CROP PLANTS II
Day Date: Friday, 24-11-2017 Max. Marks:70
Time: 02.30 PM to 05.00 PM
Instructions: Attempt totally five questions.
Question no. 1 is compulsory.
Attempt any Two questions from Q. 2 to 4 (Section II).
Attempt any Two questions from Q.5 to 7 (Section III).
All questions carry equal marks
Section I
Q.1 Rewrite the following sentences by choosing the correct alternative:- 14
Macrocyclic rust is the name given to some
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
Fungus Alternaria solani belongs to class
Ascomycetes Deuteromycetes
Schizomycetes Oomycetes
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.
Anthracnose of mango is caused by
Pythium Alternaria
Colletotrichum Fusarium
The rusts are caused by
Ustilaginales Peronosporales
Uredinales Erysiphales
Phytopathology is the study of
Algae Fungi
Plant diseases Pteridophytes
Alternaria solani causes
Late blight of potato wart of potato
early blight of potato leaf curl of potato
Page 2 of 2
SLR-MA-32
When two host species are required for completion of parasitic fungi lifecycle,
this condition is described as
Autoecism Autotrophic
Heteroecism Heterokaryotic
10) Fungal spores produced asexually at tips or side of hyphae are called as

Sporangiospores Anthrospores
Conidia Spores
11) Biological specialization is term used for fungus which
Can infect differential hosts Shows host specialization
Can grow in a variety of
substrata
Are biologically useful
12) Powdery Mildew of Grapes caused due to
Uncinula necator Cercospora sp.
Both and None of these
13) White rust of crucifer is caused by
Puccinia Utilago
Cystopus Peziza
14) Wilt of peas, Beans caused due to fungus
Uncinula necator Alternaria alternate
Alternaria solani None of these
Section II
Q.2 Describe the biology, nature of damage and control measure of downy
mildew of peas.
07
Explain any two diseases in Rose studied by you with respect to causal
organism, symptoms and control measures.
07
Q.3 Comment up on following disease with respect to causal organism,
disease cycle, and control measures:-
Black rot disease of sugar beet.
Fruit rot of cucurbits.
07
Explain Anthracnose of Mango; with respect to causal organism,
symptoms and control measures.
07
Q.4 Give details of Brown rot disease of Citrus; with respect to causal
organism, diseases cycle, symptoms and control measures.
07
Comment up on fruit decay disease in Figs. 07
Section III
Q.5 Write down the disease cycle of 'black scurf to tubers' disease of potato. 05
Write down the symptoms and control measures of Powdery Mildews. 05
Enlist any four Fruit trees disease of vegetable crops along with their
causal organism.
04
Q.6 Write down causal organism and diseases cycle of Wilt of Coconut. 05
Write down control measures of 'Fruit root of Mango'. 05
Enlist any four diseases of forest trees along with their causal organism. 04
Q.7 Write down general symptoms of powdery mildews diseases. 05
Write down symptoms of seedling blights diseases on Lacuna. 05
Enlist any two diseases of peas and beans along with causal organism 04