Diseases of Vegetable, Ornamental and Spice Crops

QUESTIONS

Q.No. 1. Fill in the blanks:

i. Sclerotia germinate at------------ temperature , and the fungus requires ------------------relative humidity.
ii. Soil amendment with -------------- reduces the incidence of crown rot disease.
iii. Symptoms of Botrytis spot are----------------, small to large spots appear with ------------margins which become -----------------during dry conditions.
iv. The mycelium of the Fusarium equiseti is -----------and produces-----------------, ------------------and------------.
v. Application of ------------------------at -----------is recommended to control Flower bud rot.

Answer key

I . 10- 35o C, > 99 per cent ii. oil cakes iii. water-soaked, brown, necrotic iv. septate, microconidia, macroconidia, chlamydospores v. Streptocycline , 150 ppm,

Q.No. 2. Choose correct answer from the following statements

1. Streptocyline is effective against

a. Bacterial diseases b. Mild mosaic c. MLO’s

2. Crown rot of tuberose is incited by

a. Fusarium sp. b. Botrytis sp. c. Sclerotium sp.

3. Propineb is quite effective to suppress the infection caused by disease in crossandra

a. Flower bud rot b. Leaf spot c. Crown rot

4.Most important viral disease in tuberose is

a. Little leaf b. Streak c. Mild mosaic

5.Scorching, necrosis and discoloration is observed in disease

a. Flower bud rot b. Stem rot c. Blight

Answers: 1 a 2 a 3 c 4 c 5 a

Q.No. 3 Write true or false against the statements

1. Flower bud rot of tuberose is caused by Corynebacterium sp.
2. Mild mosaic is an important disease of Tuberose
3. Humid weather and dry conditions are favourable for the spread of Grey mould
4. Antibiotics are useful against viruses
5. Crop rotation is a practice to control viral diseases

Answers: 1 F 2 T 3F 4 F 5 F

Q.No.4. Write short note on diseases of tuberose giving symptoms, etiology and control measures.

Q.No.5. Explain symptoms and control measures of following diseases

a.Stem rot b. Bortytis blight of tuberose