Diseases of Vegetable, Ornamental and Spice Crops

QUESTIONS

Q.No. 1. Tick the correct answer
1) Bacterial wilt in tomato is caused by:

a) Ralstonia solanacearum b) Xanthomonas spp. c) Clavibacter spp. d) None

2) Drooping of petioles of leaves without yellowing are the characteristic symptoms of :

a. Bacterial wilt b) Canker c) Fusarium wilt d) Verticillium wilt

3) Excessive development of adventitious roots in tomato takes place due to infection of:

a. Bacterial wilt b) Canker c) Fusarium wilt d) Verticillium wilt

4) Bacterial wilt is favoured by:

a. Low soil moisture and high temperature b) High soil moisture and low temperature

c) Relatively high soil moisture and high temperature d) None

5) Ralstonia solanacearum is:

a. Gram –tive and rod shaped b) Gram +tive and rod shaped
c) Gram –tive rod shaped and motile with 1 to 4 polar flagella d) None

6) Bacterial spot in tomato is caused by:

a. Xanthomonas campestris pv. vesicatoria b) Xanthomonas capsici

c) Xanthomonas campestris d) Xanthomonas solanacearum

7) Bacterial canker is caused by:

a. Clavibacter michiganensis sub sp. michiganensis b) Clavibacter lycopersici
c) Clavibacter solanacearum pv. solanacearum d) None

8) Leaf curl in tomato is transmitted by :

a) Whitefly b) Thrips c) Aphids d) Leaf hopper

9) Tomato spotted wilt virus is transmitted by :

a) Whitefly b) Thrips c) Aphids d) Leaf hopper

Answers Q. No. 1: 1. a 2. a 3.a 4.c 5.c 6. a. 7. a 8. a 9. b

Q. 2. Fill in the blanks

1. Mechanical blockage of vascular bundles is caused by ------------------------------------- in
bacterial wilt.
2. Excessive development of adventitious roots takes place due to infection of ------------------ disease.
3. Bacterial wilt pathogen is ---------------------------- and --------------------- in nature.
4. Bacterial canker is caused by---------------------------------------------------.
5. ------------------------------ causes significant reduction in nodes and intermodal lengths.
6. Tomato leaf curl virus belongs to --------------------- group.
7. Tomato spotted wilt virus is transmitted by---------------------------------------.
8. Genome of Tomato spotted wilt virus is ---------------------.
9. Tomato mosaic virus is transmitted by -----------------------.
Answers Q. No. 2. 1. Polysaccharides 2. Bacterial wilt 3. Seed, soil borne 4. Clavibacter michiganensis pv. michiganensis 5. Leaf curl 6. Gemini Virus Group 7. Thrips 8. Single stranded RNA 9. Sap and Graft.

Subjective type Questions

1. Enlist the main viral diseases of tomato? Explain their symptoms.
2. Mention important bacterial diseases of tomato along with their causal organisms.
3. Write management practices for following diseases:

a. Viral diseases
b. Bacterial diseases