M.Sc. (Semester IV) (CBCS) Examination Mar/Apr-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 following sentences by choosing the correct alternative.
14
Fungus Alternaria solani belongs to class:
Ascomycetes
Deuteromycetes
Schizomycetes
Oomycetes
Obsorbing nourishment from the host
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
Alternaria solani causes
Late blight of potato
Wart of potato
Early blight of potato
Leaf curl of potato
Powdery mildew of Grapes caused due to
Uncinula necator
Cercospora sp.
Both and
None of these
Wilt of Peas, Beans caused due to fungus
Uncinula necator
Alternaria alternata
Alternaria Solani
None of these
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
Wilt disease of tomato is caused by
Aspergillus
Puccinia
Cercospora
Fusarium
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SLR-UA-24
10) 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.
11) 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
12) Anthracnose of mango is caused by
Pythium
Alternaria
Colletotrichum
Fusarium
13) Downy mildews are caused by the members of
Erysiphales
Taphrinales
Ustilaginales
Peronosporales
14) The rusts are caused by
Ustilaginales
Peronosporales
Uredinales
Erysiphales
Section II
Q.2
a)Explain the causal organism, nature of damage, symptoms and control measure of Blight disease of Tomato.
07
b)Explain the causal organism, nature of damage, symptoms and control measure of Anthracnose of Papaya.
07
Q.3
a)Comment up on following diseases with respect to causal organism, and control measures.
Black rot disease of sugar beet
Fruit rot of Cucurbits
07
b)Explain Anthracnose of Mango; with respect to causal organism, symptoms control measures.
07
Q.4
a)Give details of Brown rot disease of Citrus; with respect to causal organism, disease cycle, symptoms control measures.
07
b)Comment up on fruit decay disease in Figs.
07
Section III
Q.5
a)Write down the disease cycle of „black scurf of tubers‟ disease of potato.
05
b)Write down the symptoms and control measures of Powdery mildews.
05
c)Enlist any four Fruit trees diseases of vegetable crops along with their casual organism.
04
Q.6
a)Write down causal organism and disease cycle of Wilt of Coconut.
05
b)Write down control measures of „Fruit root of Mango‟.
05
c)Enlist any four diseases of forest trees along with their causal organism.
04
Q.7
a)Write down symptoms of black spot diseases on Guava.
05
b)Write down general symptoms of fungal diseases.
05
c)Enlist any two diseases of peas and beans along with their casual organism.