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Plant Diseases (B.Sc. Agriculture)

Description: Plant diseases, Diseases related to plants, Plant disorders
Number of Questions: 15
Created by:
Tags: Plant diseases Diseases related to plants Plant disorders Plant Diseases
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Fire blight of pome fruits is caused by

  1. Cryphonectria parasitica

  2. Erwinia amylovora

  3. Cochliobolus heterostrophus

  4. Phytophthora parasitica


Correct Option: B
Explanation:

Erwinia amylovora bacterium causes fire blight of pome fruits.

Which disease does Magnaporthe grisea cause in rice?

  1. Leaf blight disease

  2. Blast disease

  3. Foot rot disease

  4. Brown spot disease


Correct Option: B
Explanation:

Magnaporthe grisea fungus causes blast disease in rice.

In which disease can purple brown mold be observed on leaf surface?

  1. Downy mildew

  2. Powdery mildew

  3. Bird's eye spot

  4. Scabs


Correct Option: A
Explanation:

Purple brown mold is apparent on the leaf surface in downy mildew.

Which plant is affected by black spot disease?

  1. Tulip

  2. Grape

  3. Rose

  4. Potato


Correct Option: C
Explanation:

Black spot is a common disease in roses. 

With which of the following conditions are Cytospora and Nectria genus of fungi associated?

  1. Rust

  2. Wilts

  3. Cankers

  4. Blight


Correct Option: C
Explanation:

Cytospora and Nectria genus of fungi are associated with cankers. 

What is the economic importance of fungus Trichoderma harzianum?

  1. Plant pathogen

  2. Biocontrol agent

  3. Nitrogen fixation

  4. Animal disease


Correct Option: B
Explanation:

Trichoderma harzinium is a fungus that is also used as a fungicide. 

Which form of infection turns grapes brown and hardens them into small black berries?

  1. Rot

  2. Mildew

  3. Canker

  4. Rust


Correct Option: A
Explanation:

Grapes infected with black rot turn brown, then harden into small, black, mummified berries.

Which genus causes foot rot disease in rice?

  1. Burkholderia

  2. Erwinia

  3. Xanthomonas

  4. Pseudomonas


Correct Option: B
Explanation:

Erwinia chrysanthemi causes foot rot disease of the rice.

Which of the following is a bacterial disease of wheat?

  1. Southern blight

  2. Head blight

  3. Spike blight

  4. Agropyron mosaic


Correct Option: C
Explanation:

Spike blight is a bacterial disease caused by Rathayibacter tritici.

Which of the following crops is/are affected by Stewart's wilt?

  1. Grapes

  2. Cabbage

  3. Corn

  4. Bean


Correct Option: C
Explanation:

The bacterial disease Stewart's wilt affects sweet corn crops.  

What is the infection by phytopthera on pepper, tomatoes and potatoes called?

  1. Early blight

  2. Late blight

  3. Fire blight

  4. Canker


Correct Option: B
Explanation:

Phytophthera infection is known as late blight. 

Which lifestyle is followed by Pratylenchus (a nematode parasite on plants)?

  1. Semi-endoparasite

  2. Migratory endoparasite

  3. Ectoparasite

  4. Sedentary endoparasite


Correct Option: B
Explanation:

Pratylenchus resides as migratory endoparasite. 

Which is the causative organism of bacterial wilt of potato?

  1. Pseudomonas fluorescens

  2. Dickeya solani

  3. Pectobacterium carotovorum

  4. Ralstonia solanacearum


Correct Option: D
Explanation:

Ralstonia solanacearum causes bacterial wilt of potato.

Which of the following diseases is etiologically different from the others?

  1. Leaf blister

  2. Corn smut

  3. Citrus canker

  4. Downy mildew


Correct Option: C
Explanation:

Citrus canker is a bacterial disease.

What can be the possible cause of tipburn leaves on conifers?

  1. Bacterial infection

  2. Sunburn

  3. Ozone pollution

  4. Salinity


Correct Option: C
Explanation:

The most possible cause of tipburn leaves on conifers is ozone pollution.

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