Microbiology and Plant Pathology-Major Plant Diseases [IFS (Forests Services) Botany (Mains)]: Questions 1 - 8 of 8

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Question number: 1

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Write short notes on the following: Tundu disease of wheat (Paper-1, Section-A)

Explanation

  • Tundu disease of wheat is also called as yellow Ear rot or Ear cockle.

  • Tundu is a minor disease problem worldwide.

  • It is quite common in north-west regions of India.

  • This disease of wheat was first reported by Hutchinson in 1917 from Punjab.

  • Now it is spread in many other parts of the country like Haryana, U. P. , Rajasthan, M. P. and Bihar.

  • This diseas

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Question number: 2

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Write short note on: Powdery mildew diseases in plants (Paper-1, Section-A)

Explanation

Definition:

  • Powdery mildew is a fungal disease of the foliage, stems and occasionally flowers and fruit where a superficial fungal growth covers the surface of the plant.

  • Powdery mildews are a group of related fungi which attack a wide range of plants, causing a white, dusty coating on leaves, stems and flowers.

How to Identify Powdery Mildew:

  • A plant

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Question number: 3

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Causal organisms, symptoms and control of wheat rusts in India (Paper 1, Section A)

Explanation

Three types of wheat rusts are known and all of them frequently occur in India.

  1. Black or stem rust

  2. Orange – Brown rust

  3. Yellow stripe rust

Black or stem rust:

Causal organism: Puccinia graminis tritici

Symptoms:

  • Symptoms are produced on almost all aerial parts of the wheat plant but are most common on stem, leaf sheaths and upper and lower leaf surfaces.

  • Pu

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Question number: 4

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Dissemination of pathogens by insects (Paper 1, Section A)

Explanation

  • Since the discovery by Waite that bees and wasps can transmit bacteria causing fire blight of apple and pear, Erwinia amylovora, much information has been accumulated on the role of insects and other small animals in the dissemination of plant-pathogenic viruses, bacteria and fungi.

  • Many small animals help in the dissemination of some pathogens occa

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Question number: 5

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Diseases caused by mycoplasma. (Paper 2)

Explanation

  • Mycoplasma is the smallest known aerobic prokaryotes without a cell wall.

  • In plants mycoplasma produce disease usually by upsetting the hormonal balance.

  • The imbalance is expressed in the form of symptoms such as dwarfness, loss of apical dominance and enlargement of floral buds and brunchy growth of newly formed sprouts.

  • In plants mycoplasma cause di

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Question number: 6

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Powdery mildew diseases in plants. (Paper 2)

Explanation

Disease

  • mildews is disease in with the pathogen grows mostly on the surface of the host and appears in the form of white, grey, brownn leaves, youngst and fruits.

  • When the spores are in the form of powdery layer on the host surface, they are called as powdery mildews.

Casual organism

  • Disease is caused by the member of Erysiphales. They are obligate par

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Question number: 7

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Explain Tundu disease of wheat (Paper 2)

Explanation

Disease

Tundu disease of Wheat

Casual organism

This disease is caused by Corynebacterium tritici which belong to actinomycetes group of bacteria.

Host

Triticum aestivum, Triticum dicoccum, Triticum turgidum

Symptoms-

  • In early time yellow ear rot or Tundu disease consist of parallel yellow or white streaks along leaf veins.

  • Alter sometime conspicuous yellow

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Question number: 8

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Describe briefly the symptoms and control measures of black stem rust of wheat. Name the causal organism. Why is it known as macro cyclic rust?

Explanation

Black rust of wheat

Causal organism- Puccinia graminis

Host- Triticum aestivum

Symptoms-

  • The black rust name is given to this rust due to its dark black colour telia.

  • Uredial pustules appear on stem, leaves, earhrads and leaf sheath but most affected area is stem.

  • The pustules are reddish-brown in colour and elongated in shape.

  • The rust spread faster in w

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