• Important Diseases of Plants (GATE - XL)
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Important Diseases of Plants (GATE - XL)

Description: GATE
Number of Questions: 15
Created by:
Tags: GATE Bacteria and Viruses and Their Control Measures Diseases of Important Crops Caused by Fungi
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Which of the following a bacterial disease of peas?

  1. Brown spot

  2. Black leaf

  3. Gray mold

  4. Powdery mildew

  5. Wilt

Show answer
Correct Option: A
Explanation:

Brown spot of peas is caused by bacterium Pseudomonas syringae.

_______ is not caused by a fungus.

  1. Gumming disease

  2. Black stripe

  3. Pineapple disease

  4. Rind disease

  5. Black rot

Show answer
Correct Option: A
Explanation:

Gumming disease of sugarcane is caused by bacterium Xanthomonas axonopodis.

_________ is caused by a virus.

  1. False eyespot of wheat

  2. Wheat yellow leaf

  3. Pink seed of wheat

  4. Downy mildew of wheat

  5. Ergot of wheat

Show answer
Correct Option: B
Explanation:

Wheat yellow leaf virus is a wheat, barley, rye and oat pathogenic virus of the family Closteroviridae. 

White mold of pepper is caused by

  1. Botrytis cinerea

  2. Sclerotinia sclerotiorum

  3. Peronospora tabacina

  4. Stemphylium solani

  5. Macrophomina phaseolina

Show answer
Correct Option: B
Explanation:

White mold of pepper is caused by Sclerotinia sclerotiorum.

Northern corn leaf blight is caused by

  1. Puccinia sorghi

  2. Bipolaris maydis

  3. Exserohilum turcicum

  4. Puccinia polysora

  5. Cercospora zeae-maydis

Show answer
Correct Option: C
Explanation:

Northern corn leaf blight is caused by fungus Exserohilum turcicum.

Identify the mismatched pair of disease and its causative agent.

  1. Black root rot of cotton: Thielaviopsis basicola

  2. Black rot of crucifers: Xanthomonas campestris

  3. Gray mold of hemp: Agrobacterium tumefaciens

  4. Downy mildew of mustard: Peronospora parasitica

  5. Bottom rot of lettuce: Rhizoctonia solani

Show answer
Correct Option: C
Explanation:

The most important disease of hemp is gray mold.

_______ is caused by a bacterium.

  1. Corn smut

  2. Citrus canker

  3. Wheat leaf rust

  4. Red rot of sugarcane

  5. Potato late blight

Show answer
Correct Option: B
Explanation:

Citrus canker is a disease affecting citrus species.

Which of the following matchings is not correct?

  1. Coffee leaf rust: Hemileia vastatrix

  2. Ergot of rye: Claviceps purpurea

  3. Early blight of potato: Phytophthora infestans

  4. Crown rust of oats: Puccinia coronata

  5. Halo blight of beans: Pseudomonas syringae

Show answer
Correct Option: C
Explanation:

Early blight of potato is caused by the fungus Alternaria solani.

Wildfire of tobacco is caused by

  1. Agrobacterium rhizogenes

  2. Erwinia carotovora

  3. Pseudomonas syringae

  4. Ralstonia solanacearum

  5. Rhodococcus fascians

Show answer
Correct Option: C
Explanation:

Wildfire of tobacco is caused by Pseudomonas syringae.

Which of the following plant diseases are caused by fungi?

P. Black rot of crucifers Q. Downy mildew of rice R. Fire blight of pome fruits S. Red rot of sugarcane

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: D
Explanation:

 Downy mildew of rice and red rot disease of sugarcane are caused by the fungus Sclerophthora macrospora and Colletotrichum falcatum, respectively.

Powdery mildew of cucurbits is caused by

P. Erysiphe cichoracearum Q. Blumeria graminis R. Sphaerotheca fuliginea S. Erysiphe necator

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S

Show answer
Correct Option: B
Explanation:

Powdery mildew of cucurbits is caused by fungus Sphaerotheca fuliginea (syn. Podosphaera xanthii).

Which of the following are used as biocontrol agents?

P. Agrobacterium radiobacter Q. Pythium insidiosum R. Sclerotinia sclerotiorum S. Trichoderma harzianum

  1. P and Q

  2. P and S

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: B
Explanation:

This option is correct because Agrobacterium radiobacter is an effective, commercially applied, biological control agent for the prevention of crown gall disease.

Asian soyabean rust is caused by

P. Phakopsora pachyrhizi Q. Phakopsora meibomiae R. Puccinia purpurea S. Puccinia graminis

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: A
Explanation:

Soybean rust is a disease that affects soyabeans and other legumes.

Match the columns:

 
Column - I Column - II
A. Black rust 1. Puccinia triticina
B. Brown rust 2. Puccinia recondita
C. Yellow rust 3. Puccinia striiformis

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

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

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

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

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

Show answer
Correct Option: A
Explanation:

Correct matching is A - 1, B - 2, C - 3.

Match the columns:

 
Column - I Column - II
A. Loose smut of barley 1. Tilleta laevis
B. Covered smut of barley 2. Ustilago tritici
C. Loose smut of wheat 3. Ustilago hordei
D. Covered smut of wheat 4. Ustilago nuda

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

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

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

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

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

Show answer
Correct Option: C
Explanation:

Loose smut of barley is caused by Ustilago nuda. Covered smut of barley is caused by the fungus Ustilago hordei.

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