M.Sc. (Semester (CBCS) Examination Nov/Dec-2018
Agrochemicals and Pest Management
PLANT PATHOLOGY AND WEED MANAGEMENT
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
Draw neat labeled diagram wherever necessary.
Figures to the right indicate full marks.
Q.1 Rewrite the sentences by choosing correct answer from given alternatives: 14
Dodder (Cuscuta) is
Algal pathogen Fungal pathogen
Parasitic insect Parasitic plant
Mildew type diseases generally caused by
Algae Bacteria
Fungi Viruses
Papaya ring rot disease caused by
TMV SMV
BBTV PRSV
Crawn gall of grapes caused by spp.
Nitrosomonas Azatobactor
Xanthomonas Agrobacterium
Leaf curl disease of Chilli caused by
Fungi MLO's
Nematodes Viruses
Weeds that live for many years are called as weeds.
Annual Biennials
perennials None of these
Crop rotation is method of weed control.
Biological Physical
Chemical None of these
MLOs are plant pathogenic organisms.
Cell wall less Eukaryotic
Photosynthetic Both a b
are the green photosynthethic pathogens.
Algae Bacteria
Fungi Viruses
10) Cephaleuros viresense causes disease in Mango.
Wilt Smut
Rust mildew
11) Echornia spp. is type of weed.
Wasteland Aquatic
Coastal None of these
Page 2 of 2
SLR-VA-4
12) Most of plant viruses show as genetic material.
RNA DNA
Both a b All of these
13) Striga is
Bud Stem
Root Leaf
14) Hand weeding is method of weed control.
Biological Physical
Chemical None of these
Q.2 Answer the following any four:-
1. What is plant disease?
2. Write causal organism of GSD.
3. What is mean by causal organism?
4. Write any two symptoms of red rust of mango.
5. Define weeds.
08
Write notes on any
1. Chemical weapons of plant pathogens.
2. Physical method of weed control.
3. Symptoms of Crown gall of grapes.
06
Q.3 Answer the following. (Any Two)
1. Write the symptoms and disease cycle in red rust of Mango.
2. Properties of mycoplasma.
3. Disease cycle and symptoms of Wilt of Banana.
08
Answer the following. (Any One)
1. Comment up on Citrus greening with respect to symptoms, disease cycle
its control measures.
2. Comment up on Ergot of Bajara with respect to symptoms, disease cycle
and its control measures.
06
Q.4 Answer the following. (Any Two)
1. Write in brief Koch's postulates.
2. Enlist characteristics of fungi.
3. Explain disease cycle in Papaya ring spot.
10
Answer the following. (Any One)
1. Enlist the symptoms and control measures of Club root of cabbage.
2. Enlist the symptoms and control measures of leaf curl of chillies.
04
Q.5 Answer the following. (Any Two) 14
Define weeds? Give its classification, life cycle and dispersal mechanism.
Write an essay on Epidemiology.
Comment up on histochemical procedure in plant disease diagnosis.