• Nature and Classification of Plant Diseases (GATE)
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Nature and Classification of Plant Diseases (GATE)

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Number of Questions: 15
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Tags: Gat Nature and Classification of Plant Diseases
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Which of the following pairs of ‘cotton diseases - causing fungi’ is not correct?

  1. Lint contamination - Aspergillus flavus

  2. Powdery mildew - Oidiopsis gossypii

  3. Stem canker - Ramularia gossypii

  4. Black root rot - Chalara elegans

  5. Anthracnose - Colletotrichum gossypii

Show answer
Correct Option: C
Explanation:

Stem canker of cotton is caused by Phoma exigua fungus. Ramularia gossypii causes aereolate mildew disease in cotton.

Which of the following statements is/are not correct?

  1. Leaf streak disease of maize is caused by Stenocarpella macrospora.
  2. Stem rot of potato is caused by Sclerotium rolfsii.
  3. Athelia arachnoidea causes crater rot in carrot.
  4. Cercospora brachypus causes noble rot disease in grapes.

  1. Only 1

  2. 1 and 2

  3. 2 and 3

  4. 3 and 4

  5. Only 4

Show answer
Correct Option: E
Explanation:

Correct answer. Grey rot or Noble rot disease is caused by Botrytis cinerea in grapes. Mycosphaerella angulata and Cercospora brachypus cause angular leaf spot in grapes. Hence, the statement 4 is false.

Which of the following is the causative fungal agent for ‘Halo spot’ disease in barley?

  1. Pyrenophora teres f. teres

  2. Rhynchosporium secalis

  3. Blumeria graminis f. sp. hordei

  4. Puccinia hordei

  5. Pseudoseptoria stomaticola

Show answer
Correct Option: E
Explanation:

In barley, white to tan, small and semi-rectangular spot or blotch with a dark brown edge aligned along the veins of the leaf blade is known as Halo spot disease. The causative fungus of the said disease is Pseudoseptoria stomaticola.

Identify the false statement(s).

A. Tropical cotton rust of cotton is caused by Phakopsora gossypii. B. Puccinia striiformis causes scald disease in barley. C. The causative agent for cottony snow mold of wheat is Tilletia controversa.

  1. Only A

  2. Only B

  3. Only C

  4. A and B

  5. B and C

Show answer
Correct Option: E
Explanation:

The causative fungal agent for stripe yellow rust of barley is Puccinia striiformis. Scald disease of barley is caused by the fungus Rhynchosporium secalis. Cottony snow mold disease of wheat is caused by the fungus Coprinus psychromorbidus. Dwarf bunt of wheat is caused by Tilletia controversa. Hence, the statements B and C both are false.

Which of the following fungal causing pathogens is responsible for ‘Anthracnose’ in raspberry?

  1. Collectotrichum gloeosporiodes

  2. Collectotrichum autatum

  3. Elsinoe ampellina

  4. Elsinoe veneta

  5. Gloeosporium musarum

Show answer
Correct Option: D
Explanation:

In raspberry, Elsinoe veneta causes anthacnose disease.

Which of the following pairs is not one of the fungal diseases, caused by pathogens in sugarcane?

  1. Yellow leaf spot - Cercosporidium kopkei

  2. Black stripe - Peronosclerospora sacchari

  3. Stem canker - Cytospora sacchari

  4. Red rot - Cercosporidium falcatum

  5. Brown leaf spot - Cercosporidium longipes

Show answer
Correct Option: B
Explanation:

Black stripe disease in sugarcane is caused by Cercospora atrofiliformis. Peronosclerospora sacchari fungus causes downy mildew disease in sugarcane.

Which of the following is the fungal causing pathogen for ‘Pepper leaf spot’ disease in Alfalfa?

  1. Stemphylium botryosum

  2. Leptosphaerulina briosiana

  3. Leptotrochila medicaginis

  4. Cercospora medicaginis

  5. Rhizoctonia leguminicola

Show answer
Correct Option: B
Explanation:

Pepper leaf spot is caused by the fungus Leptosphaerulina briosiana in Alfalfa.

Match the items given in Group-I with those given in Group-II and choose the correct option ||| |---|---| |Group-I |Group-II| |P. Angular leaf scorch of grapes|1. Leptosphaeria sacchari| |Q. Ring spot of sugarcane|2. Phymatotrichopsis omnivore| |R. Collar canker of tea|3. Pseudopezicula tetraspora| |S. Cotton root rot of crucifer|4. Phomopsis theae|

  1. P - 1, Q - 3, R - 4, S - 2

  2. P - 2, Q - 3, R - 4, S - 1

  3. P - 3, Q - 4, R - 1, S - 2

  4. P - 3, Q - 1, R - 4, S - 2

  5. P - 4, Q - 3, R - 1, S - 1

Show answer
Correct Option: D
Explanation:

Correct answer. Pseudopezicula tetraspora is a fungus and causes angular leaf scorch in grapes. The causative fungus for ring spot in sugarcane is Leptosphaeria sacchari. Collar canker of tea is caused by Phomopsis theae. Cotton root rot of crucifer is caused by the fungus, Phymatotrichopsis omnivore.

Identify the incorrect pair about 'fungal diseases - causing pathogens’ in citrus.

  1. Whisker mold - Penicillium ulaiense

  2. Mal secco - Phoma tracheiphila

  3. Blue mold - Penicillium italicum

  4. Green fruit mold - Mucor paronychia

  5. Rootlet rot - Pythium rostratum

Show answer
Correct Option: D
Explanation:

Penicillium digitatum causes green fruit mold in citrus.

Among the following pathogens, the fungus associated with Tracheomycosis in coffee is

  1. Corticium koleroga

  2. Phoma costaricensis

  3. Gibberella xylarioides

  4. Cercospora coffeicola

  5. Fusarium solani

Show answer
Correct Option: C
Explanation:

Tracheomycosis is caused by the fungus Gibberella xylarioides in coffee.

Match the items given in Column-I with those given in Column-II and choose the correct option ||| |---|---| |Column-I
|Column-II | |P. Green fruit rot of almond|1. Monilinia fructicola| |Q. Twig blight of apricot|2. Ustulina deusta| |R. Clitocybe root rot of apple|3. Glomerella cingulata| |S. Collar rot of cacao|4. Armillaria tabescens| | |5. Sclerotinia sclerotiorum|

  1. P - 3, Q - 1, R - 5, S - 2

  2. P - 5, Q - 1, R - 4, S - 2

  3. P - 3, Q - 4, R - 5, S - 2

  4. P - 2, Q - 3, R - 4, S - 1

  5. P - 1, Q - 4, R - 5, S - 3

Show answer
Correct Option: B
Explanation:

Green fruit rot of almond is caused by Sclerotinia sclerotiorum. The causative agent for twig blight of apricot is Monilinia sp., like M. fructicola and M. laxa. Clitocybe root rot of apple are caused by the fungus Armillaria tabescens. Collar rot of cacao is caused by the fungus Ustulina deusta. Hence, the correct sequence of codes is P-5, Q-1, R-4, S-2.

Match the diseases in Column-I with causing pathogens in Column-II and select the correct answer using the codes given below.

Column-I Column-II
P. Tropical cotton rust 1. Phakopsora gossypii
Q. Powdery mildew of pea 2. Trametes versicolor
R. Wood rot of pear 3. Helminthosporium solani
S. Silver scurf of potato 4. Erysiphe pisi
5. Polyscytalum pustulans

  1. P - 1, Q - 4, R - 2, S - 3

  2. P - 2, Q - 4, R - 1, S - 5

  3. P - 4, Q - 1, R - 2, S - 3

  4. P - 1, Q - 4, R - 5, S - 2

  5. P - 5, Q - 4, R - 2, S - 3

Show answer
Correct Option: A
Explanation:

Tropical cotton rust is caused by the fungus, Phakopsora gossypii. The causing agent for powdery mildew in pea is Erysiphe pisi. Wood rot of pear is caused by the fungus, Trametes versicolor. Helminthosporium solani causes silver scurf disease in potato. Hence, the correct answer using the codes is P-1, Q-4, R-2, S-3.

Match the items given in Group-I with those given in Group-II and choose the correct option ||| |---|---| |Plant diseases
|Causing pathogens| |P. Stem rot of rice|1. Helminthosporium sp. | |Q. False eye spot disease of wheat |2. Magnaporthe salvini| |R. Gray spot of tea|3. Phyllosticta dusana| |S. Target blotch of sugarcane|4. Gibellina cerealis|

  1. P - 1, Q - 3, R - 4, S - 2

  2. P - 2, Q - 3, R - 4, S - 1

  3. P - 3, Q - 4, R - 1, S - 2

  4. P - 2, Q - 4, R - 3, S - 1

  5. P - 2, Q - 3, R - 1, S - 4

Show answer
Correct Option: D
Explanation:

Stem rot of rice is caused by Magnaporthe salvini and Sclerotium oryzae. False eye spot disease of wheat is caused by the fungus, Gibellina cerealis. Gray spot of tea is caused by Phyllosticta dusana. The causing agent for target blotch in sugarcane is Helminthosporium sp. Hence, the correct answer using the codes is P-2, Q-4, R-3, S-1.

Match the fungal diseases in Group-I with causative pathogens in Group-II.

 
Group-I
Group-II
P. Leaf spot of cherries and palms 1. Claviceps purpurea
Q. Ergot of barley 2. Taphrina deformans
R. Citrus greasy leaf spot 3. Blueriella sp.
S. Leaf curl of peach and apricot 4. Drechslera teres
5. Mycosphaerella citri

  1. P - 3, Q - 1, R - 5, S - 2

  2. P - 5, Q - 1, R - 4, S - 2

  3. P - 3, Q - 4, R - 5, S - 2

  4. P - 2, Q - 3, R - 4, S - 1

  5. P - 1, Q - 4, R - 5, S - 3

Show answer
Correct Option: A
Explanation:

Leaf spot of cherries and palms is caused by Blueriella sp. The causative agent for ergot disease in barley is Claviceps purpurea. Citrus greasy leaf spot is caused by the fungus Mycosphaerella citri. Banana leaf spot is caused by Mycosphaerella musicosa. Taphrina deformans causes leaf curl of peach and apricot. Hence, the correct sequence of codes is P-3, Q-1, R-5, S-2.

Match the diseases in List-A with causative fungal pathogens in List-B and select the correct answer using the codes given below.

List-A
List-B
A. Cottony snow mold of wheat 1. Sclerotium rolfsii
B. White leaf spot of crucifer 2. Coprinus psychromorbidus
C. Hull rot of almond 3. Rhizopus sp.
D. Southern blight of cotton 4. Pseudocercosporella capsellae

  1. A - 2, B - 4, C - 3, D - 1

  2. A - 3, B - 1, C - 4, D - 2

  3. A - 2, B - 4, C - 1, D - 3

  4. A - 1, B - 3, C - 2, D - 4

  5. A - 2, B - 1, C - 3, D - 4

Show answer
Correct Option: A
Explanation:

Cottony snow mold of wheat is caused by the fungus, Coprinus psychromorbidus. White leaf spot of crucifer is caused by Pseudocercosporella capsellae. Hull rot disease of almond is mainly caused by Rhizopus sp. Southern blight of cotton is caused by the fungal pathogen, Sclerotium rolfsii. Hence, the sequence of codes A-2, B-4, C-3, D-1 is correct.

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