PAT 311 (2+1) Diseases of Field crops and their manangement Question paper

 

I. Fill in the blanks

1. Snake skin disease in paddy is also known as ____________

2. The ergot toxin produces a psychedelic compound ____________

3. The Great Bengal Famine epidemic was caused by Paddy Brown leaf spot disease during 1942–43 ____________

4. Sorghum ergot produces honey dew secretion which has asexual reproductive structure ____________ which later produces ____________

5. The monokaryotic (N) stage in the black stem rust of wheat is ____________ stage.

6. Black bundle disease is caused by the pathogen ____________

7. Foolish seedling disease symptom is caused by the hormone ____________

8. Pigeon pea sterility mosaic virus is transmitted by ____________

9. Transmission of rice ragged stunt virus by Nephotettix cincticeps in persistent manner ____________

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II. State True or False

1. Sclerotia in general causes primary infection

2. Bio control agents easily manage air borne diseases in general under tropical conditions

3. Entire head is smutted under Sphaeolotheca reliana infection in sorghum

4. Multiline resistance is a management practice followed for leaf rust in wheat

5. Leafhoppers/jassids transmit phytoplasma pathogens

6. Metalaxyl compounds in general manage powdery mildew group of pathogens

7. Compact heads are highly susceptible to grain molds in sorghum

8. Southern corn blight produces cigar shaped lesions

9. Vitavax compound controls smut diseases

10. Cyst composes of female and egg mass

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III. Match the following

A	B
1. Witch weed	a. Heterodera avenae
2. Race T	b. Plantvax
3. Cyst nematode	c. Southern corn leaf blight
4. Rust	d. Partial root parasite

(Mention A number against B)

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IV. Answer any Two questions

1. Difference between blast & brown spot disease of paddy

2. Difference between stem rust & leaf rust in wheat

3. Write four difference among the four different sorghum smut

4. Describe the symptoms and management of crinkle virus in urd bean

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V. Answer any three questions

1. Describe wheat rust (Pgt) disease cycle in detail along with the ploidy levels

2. Write in detail about any one viral disease in pigeon pea (Symptoms, pathogen, control, etc.)

3. Write in detail about fusarium wilt on chickpea (Symptoms, pathogen, control, etc.)

4. Write in detail about downy mildew disease in maize (Symptoms, pathogen, control, etc.)