Sericulture Extension Officer • 2018 • Paper-III
Marginal scorching and yellowing of Mulberry leaf is due to deficiency of
A)
Moisture
B)
Oxygen
C)
Potassium
D)
Glucose
Potassium deficiency commonly causes marginal scorch/necrosis.
Sericulture Extension Officer • 2018 • Paper-III
Application of gypsum or ammonium sulphate is recommended for
A)
Magnesium deficiency
B)
Sulphur deficiency
C)
Zinc deficiency
D)
Calcium deficiency
Both are sources of sulphur used to correct sulphur deficiency.
Sericulture Extension Officer • 2018 • Paper-III
0.5% Dimecron should be applied twice at 15 days interval to control
A)
Leaf spot
B)
Leaf rust
C)
Powdery mildew
D)
Gall infestation
Dimecron is used in the cited sericulture schedule against gall infestation.
Sericulture Extension Officer • 2018 • Paper-III
Safe period for spraying of Bavistin
A)
5-10 days
B)
10 days
C)
15 days
D)
7-10 days
A typical safe interval given for Bavistin spray is about 7–10 days.
Sericulture Extension Officer • 2018 • Paper-III
Leaf blight diseases of mulberry is caused by
A)
Virus
B)
Bacteria
C)
Fungus
D)
Nematode
Mulberry leaf blights are fungal diseases.
Sericulture Extension Officer • 2018 • Paper-III
Symptoms of Alternaria blight in Castor plant
A)
Wilting plants
B)
Appearance of irregular spots on leaves
C)
Marginal necrosis
D)
Appearance of black spots on leaves
Alternaria commonly produces dark necrotic leaf spots.
Sericulture Extension Officer • 2018 • Paper-III
Causal organism of leaf spot disease
A)
Cercospora moricola
B)
Pseudomonas mori
C)
Meloidogyne incognita
D)
Phyllactinia corylea
Cercospora moricola is a known causal organism of mulberry leaf spot.
Sericulture Extension Officer • 2018 • Paper-III
Powdery mildew causing pathogens, Phylactinia corylea is an
A)
Parasite
B)
Endoparasite
C)
Ectoparasite
D)
None of these
Powdery mildew fungi are ectoparasites growing superficially on the host.
Sericulture Extension Officer • 2018 • Paper-III
Defoliation of young leaves with necrosis along the veins is due to
A)
Calcium deficiency
B)
Bromine deficiency
C)
Magnesium deficiency
D)
Iron deficiency
Calcium deficiency damages young tissues and can cause necrosis.
Sericulture Extension Officer • 2018 • Paper-III
Symptoms of root rot disease
A)
Decaying of root
B)
Sudden withering and defoliation of leaves
C)
Fail to sprout
D)
All of these
Root decay, sudden wilting/defoliation and failure to sprout are associated symptoms.
Sericulture Extension Officer • 2018 • Paper-III
Powdery mildew can be controlled by spraying
A)
0.3% Karathane
B)
O.5% Wetable Sulphur
C)
0.1% Carbendazim
D)
0.2% Copper Oxychloride
Carbendazim is a standard systemic fungicide used against powdery mildew.
Sericulture Extension Officer • 2018 • Paper-III
Serious pest of silkworm is
A)
Dermestid beetle
B)
Jassid
C)
Uzi fly
D)
Rats
Uzi fly is a major parasitoid/pest problem in silkworm rearing.
Sericulture Extension Officer • 2018 • Paper-III
Nuclear polyhedrosis in silkworm is commonly known as
A)
Grasserie
B)
Flacherie
C)
Muscardine
D)
Pebrine
NPV disease is commonly called grasserie.
Sericulture Extension Officer • 2018 • Paper-III
Causal organism of white muscardine in silkworm Bombyx mori is
A)
Nosema bombysis
B)
Streptococcus bombysis
C)
Bm CPV
D)
Beauveria bassiana
White muscardine is caused by Beauveria bassiana.
Sericulture Extension Officer • 2018 • Paper-III
Parasitoids that attacks Oak Tasar silkworm larvae
A)
Wasps
B)
Bugs
C)
Ants
D)
Preying mantis
Several hymenopterous parasitoids attack tasar larvae.
Sericulture Extension Officer • 2018 • Paper-III
Gattine is a disease caused by combination of
A)
Virus and Protozoa
B)
Fungi and Bacteria
C)
Virus and Bacteria
D)
Virus and Fungi
Gattine is associated with mixed infection, classically virus and protozoan components.
Sericulture Extension Officer • 2018 • Paper-III
Diseased larvae should be disposed in
A)
0.2% slaked lime
B)
5% bleaching powder
C)
0.2% bleaching powder
D)
3% slaked lime
Bleaching powder solution is used for safe disposal/disinfection of diseased larvae.
Sericulture Extension Officer • 2018 • Paper-III
Before starting Muga rearing, plantation site should be disinfect by dusting bleaching powder and lime in the ratio of
A)
1:9
B)
9:1
C)
8:2
D)
3:4
The recommended bleaching powder:lime ratio is 1:9.
Sericulture Extension Officer • 2018 • Paper-III
Chemical used for disinfection in Sericulture
A)
Formalin
B)
Bleaching powder
C)
Slaked lime
D)
All of these
Formalin, bleaching powder and slaked lime can all be used for disinfection.
Sericulture Extension Officer • 2018 • Paper-III
Which is not a silkworm disease?
A)
Grasserie
B)
Powdery mildew
C)
Flacherie
D)
Muscardine
Powdery mildew is a mulberry plant disease, not a silkworm disease.
Sericulture Extension Officer • 2018 • Paper-III
Tiger band disease in Oak Tasar Silkworm was caused by
A)
Bacteria
B)
Virus
C)
Nematode
D)
Protozoa
Tiger band disease is viral.
Sericulture Extension Officer • 2018 • Paper-III
Rectal protrution is the symptoms of
A)
Muscardine
B)
Flacherie
C)
Grasserie
D)
Pebrine
Rectal protrusion/diarrhoeal signs occur in flacherie.
Sericulture Extension Officer • 2018 • Paper-III
Management of viral disease
A)
Rearing under congenial conditions of environment and nutrition
B)
Lowering humidity and used bed disinfectant
C)
Mother moth examination
D)
All of these
Environmental management, bed disinfection and mother-moth examination all help control viral disease incidence.
Sericulture Extension Officer • 2018 • Paper-III
To avoid formation of clumps of eggs, the loose eggs are dipped for 10 mins in
A)
2% formalin solution
B)
2% formaldehyde solution
C)
0.5% potassium carbonate solution
D)
0.5% bleaching powder solution
Potassium carbonate treatment is used to prevent egg clumping and aid preparation.
Sericulture Extension Officer • 2018 • Paper-III
Recommended dosage of disinfectant for rearing house and appliances
A)
5% bleaching powder + 0.2% slaked lime
B)
3% bleaching Powder + 0.5% slaked lime
C)
5% bleaching powder + 0.3% slaked lime
D)
2% bleaching powder +0.3% slaked lime
This combination is a standard disinfection formulation cited in sericulture manuals.
