Plant Pathology
The branch of science which deals with the study of nature, development and control of plant diseases is known as Plant pathology or Phytopathology.
De Bary is considered as "father of modern plant pathology".
Important terms related with plant pathology
Disease: Disease may be defined as morphological and physiological disturbance in the part caused by some external agencies.
Pathogen: An agent that generates a disease is called pathogen.
Host: Host is an organism attacked by a pathogen.
Infection: Infection is the establishment of pathogen in the host tissues.
Incubation: Incubation is the interval between infection and the appearance of a disease.
Susceptible: Host which are easily attacked by some pathogen.
Resistant: Resistant are the plants which are not attacked by Some pathogens.
Classification of Plant Diseases
I. Based on severity of infection and geographical distribution
1. Endemic diseases: A disease when more or less constantly present from year to year in a moderate to severe form is called endemic disease.
e.g. Wart disease of potato.
2. Epidemic (Epiphytic) diseases: When the disease is widespread and severe. It is known as epidemic disease.
e.g. Rust diseases of cereal crops.
3. Sporadic diseases: These are endemic disease which occurs at very irregular interval, locations and relatively in few instances.
e.g. Blotch disease of cucumber.
4. Pendemic diseases: Diseases which occure all over the world and cause mass mortality.
e.g. Late blight of potato.
II. Based on extent of infection on host
1. Localised disease: Such diseases are confined to a particular region.
e.g. only a part or organ is infected.
2. Systemic diseases: Such diseases spread on entire plant and associated with nearly every stage of its life cycle.
III. Based on nature of causal organism
1. Infectious or parasitic diseases: Such diseases are incited by living agent which are parasitic on the host. According to their causal organisms, these diseases can be mycoplasmal, viral bacterial, fungal etc.
e.g. Little leaf of brinjal (Mycoplasmal)
Leaf role of potato (Viral)
2. Non-infectious or non-parasitic diseases: Such diseases are incited by non living agent and thus non infectious. Unfavourable environment condition, deficiency of nutrients etc. are the causal factors of these diseases.
e.g. Tip burn of rice (due to high soil moisture content), Read leaf of mango (mineral deficiency)
De Bary is considered as "father of modern plant pathology".
Important terms related with plant pathology
Disease: Disease may be defined as morphological and physiological disturbance in the part caused by some external agencies.
Pathogen: An agent that generates a disease is called pathogen.
Host: Host is an organism attacked by a pathogen.
Infection: Infection is the establishment of pathogen in the host tissues.
Incubation: Incubation is the interval between infection and the appearance of a disease.
Susceptible: Host which are easily attacked by some pathogen.
Resistant: Resistant are the plants which are not attacked by Some pathogens.
Classification of Plant Diseases
I. Based on severity of infection and geographical distribution
1. Endemic diseases: A disease when more or less constantly present from year to year in a moderate to severe form is called endemic disease.
e.g. Wart disease of potato.
2. Epidemic (Epiphytic) diseases: When the disease is widespread and severe. It is known as epidemic disease.
e.g. Rust diseases of cereal crops.
3. Sporadic diseases: These are endemic disease which occurs at very irregular interval, locations and relatively in few instances.
e.g. Blotch disease of cucumber.
4. Pendemic diseases: Diseases which occure all over the world and cause mass mortality.
e.g. Late blight of potato.
II. Based on extent of infection on host
1. Localised disease: Such diseases are confined to a particular region.
e.g. only a part or organ is infected.
2. Systemic diseases: Such diseases spread on entire plant and associated with nearly every stage of its life cycle.
III. Based on nature of causal organism
1. Infectious or parasitic diseases: Such diseases are incited by living agent which are parasitic on the host. According to their causal organisms, these diseases can be mycoplasmal, viral bacterial, fungal etc.
e.g. Little leaf of brinjal (Mycoplasmal)
Leaf role of potato (Viral)
2. Non-infectious or non-parasitic diseases: Such diseases are incited by non living agent and thus non infectious. Unfavourable environment condition, deficiency of nutrients etc. are the causal factors of these diseases.
e.g. Tip burn of rice (due to high soil moisture content), Read leaf of mango (mineral deficiency)
posted by Mohd Sayeed Akhtar at
5:19 AM
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