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Causes of plants pathology disease, Lecture notes of Plant pathology

Chaudhary Charan Singh UniversityPlant pathology

Causes of plants pathology disease

Typology: Lecture notes

2023/2024

Uploaded on 07/15/2025

kunal-jatwa
kunal-jatwa 🇮🇳

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Fundamentals of Plant Pathology Mr. Vikash Kumar
Course Name: Fundamentals of Plant Pathology
Course Code: 20013600
Mr. Vikash Kumar
(Assistant Professor)
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Download Causes of plants pathology disease and more Lecture notes Plant pathology in PDF only on Docsity!

Course Name: Fundamentals of Plant Pathology

Course Code: 20013600

Mr. Vikash Kumar (Assistant Professor)

Course Objectives

1: Name and identify different Diseases, nature of pathogens and

different strategies for management of plant diseases.

2: Outline concepts, nomenclature, classification and characters of

pathogens

3: Apply different principles and methods for plant disease

management.

4: Take a part in identification of diseases and marketing of relevant

pesticides.

5: Conclude methods to diagnose and manage a wide range of plant

diseases.

Pathogenesis: Pathogenesis is the chain of events that lead to development of disease

in the host (or) sequence of progress in disease development from the initial contact

between the pathogen and its host to the completion of the syndrome.

The word comes from the Greek pathos , "disease ", and genesis , "creation". There are

several chemical weapons secreted by pathogens that are utilized as they carry out

their activities. These weapons include enzymes, toxins, growth regulators and

polysaccharides.

Steps in pathogenesis

  1. Inoculation
  2. Penetration
  3. Infection
  4. Incubation
  5. Reproduction
  6. Survival

(4.) Incubation:-

Once inside the plant, pathogens may undergo an incubation period and remain latent

for a period of time before initiating disease.

(5.) Reproduction

Most pathogens especially fungi and parasitic higher plants invade and infect plant

tissues through the point of inoculation. Therefore, these pathogens can easily grow

and spread within the plant tissues until a certain limit or death occurs.

(6.) Survival:-

Plant pathogens have evolved so they can survive prolonged periods of unfavourable

weather conditions.

Causes of Plant Diseases

Plant diseases are caused by a variety of pathogens. The word pathogen can be

broadly defined as any agent or factor that incites ‘pathos’ or disease in an organism.

Thus in strict sense, the pathogens do not necessarily belong to living or animate

groups.

(1.) Abiotic (Inanimate) factors

They include mainly the deficiency or excess of nutrients, light, moisture, aeration,

abnormality in soil condition, atmospheric impunities etc.

(2.) Mesobiotic causes These are the disease incitants which are neither living nor non-living. They are:  (^) Viruses : They are infections agents made up of one type of nucleic acid (RNA or DNA) enclosed in a protein coat. Examples of viral diseases of plants are: potato leaf roll, leaf curl of tomato and chillies, and mosaic disease of many plants.  (^) Viroids : They are naked, infectious strands of nucleic acid. They cause diseases like potato spindle tuber, citrus exocortis, chrysanthemum stunt, cadang cadang of coconut palm, star crack of apple, etc.

(3.) Biotic (Animate) causes This category includes the pathogens which are animate or living or cellular organisms. They are:  (^) Fungi  (^) Bacteria  (^) Phytoplasmas  (^) Spiroplasmas  (^) Algae  (^) Nematode  (^) Parasitic flowering plants (Phanerogamic plant parasites): Dodder, Striga, Orobranche, Loranthus, Phoradendron, etc.

Thank You