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Plant Diseases

Description: GATE Life Sciences Botany Plant diseases Fungus Bacteria Crop management Cultivation Agriculture Common Diseases and Their ControlPlant Breeding for Disease ResistanceInfectious Diseases
Number of Questions: 15
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Tags: GATE Life Sciences Botany Plant diseases Fungus Bacteria Crop management Cultivation Agriculture Common Diseases and Their Control Plant Breeding for Disease Resistance Infectious Diseases
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The plant disease which is caused by a bacteria is

  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 that is caused by the bacterium Xanthomonas axonopodis.

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, a rod-shaped, gram-negative bacterium with polar flagella. 

Which of the following is 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 bacteria Pseudomonas syringae.

Powdery mildew of cucurbits is caused by P. Erysiphe cichoracearum Q. Blumeria graminis R. Sphaerotheca fuliginea S. Erysiphe necator Select the correct answer using codes given below:

  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 two fungus: Sphaerotheca fuliginea (syn. Podosphaera xanthii) and Erysiphe cichoracearum (syn. Golovinomyces cichoracearum).

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, caused by the fungus botrytis cinerea. Crown gall of hemp is caused by agrobacterium tumefaciens.

__________ 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 of the family Closteroviridae. 

Which organism causes white mold of pepper?

  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.

Which sugarcane disease 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 bacteria xanthomonas axonopodis.

Asian soyabean rust is caused by P. Phakopsora pachyrhizi Q. Phakopsora meibomian R. Puccinia purpurea S. Puccinia graminis Select the correct answer using codes given below:

  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, also known as asian soybean rust, is a disease that affects soybeans and other legumes. It is caused by two types of fungi: phakopsora pachyrhizi and phakopsora meibomian.

Match the column – I (Disease) with column – II (Causative agent) and select the correct option.

Column – I Column – II
A. Loose smut of barley 1. Tilletia 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 - 4, B - 3, C - 2, D - 1

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

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

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

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

Show answer
Correct Option: A
Explanation:

Incorrect matching. Correct matching is Loose smut of barley - Ustilago nuda Covered smut of barley - Ustilago hordei Loose smut of - Ustilago tritici Covered smut of wheat - Tilleta laevis

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:

Agrobacterium radiobacter is an effective, commercially applied, biological control agent for the prevention of crown gall disease caused by many virulent strains of Agrobacterium tumefaciens and Agrobacterium rhizogenes. Trichoderma harzianum is an effective biocontrol agent against several fungal soil borne plant pathogens.

Match the column – I (Wheat leaf rust) with column – II (Causative agent) and select the correct option.

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 answer. Wheat leaf rust is fungal disease that affects wheat, barley and rye stems, leaves and grains. Puccinia triticina causes 'black rust'; puccinia recondita causes 'brown rust' and puccinia striiformis causes 'yellow rust'.

Which of the following matches of crop disease: causative agent 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 caused by the fungus alternaria solani. Phytophthora infestans is an oomycete that causes the serious potato disease known as late blight of potato.

What causes northern corn leaf blight?

  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.

Which of the following plant diseases are caused by fungus? P. Black rot of crucifers Q. Downy mildew of rice R. Fire blight of pome fruits. S. Red rots of sugarcane Select the correct answer using codes given below:

  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 is caused by the fungus sclerophthora macrospora. Red rot disease of sugarcane is caused by fungus colletotrichum falcatum.

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