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Questions and Answers
What distinguishes viral diseases from physiological diseases?
What distinguishes viral diseases from physiological diseases?
Which of the following is a characteristic of physiological diseases in plants?
Which of the following is a characteristic of physiological diseases in plants?
What are endemic diseases characterized by?
What are endemic diseases characterized by?
What does the term 'epiphytotic' specifically refer to?
What does the term 'epiphytotic' specifically refer to?
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Which of the following represents a common aspect of parasitic diseases?
Which of the following represents a common aspect of parasitic diseases?
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What is a key difference in symptoms between physiological and parasitic diseases?
What is a key difference in symptoms between physiological and parasitic diseases?
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Which of the following is NOT a factor leading to physiological diseases in plants?
Which of the following is NOT a factor leading to physiological diseases in plants?
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The decline phase of an epiphytotic disease is characterized by what?
The decline phase of an epiphytotic disease is characterized by what?
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What type of diseases are characterized by their occurrence at irregular intervals and affecting only a few plants?
What type of diseases are characterized by their occurrence at irregular intervals and affecting only a few plants?
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Which type of disease affects only a specific part of the host plant?
Which type of disease affects only a specific part of the host plant?
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What type of diseases perpetuate within seeds and become active during seed germination?
What type of diseases perpetuate within seeds and become active during seed germination?
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Which classification of plant diseases spreads through the soil and can infect roots?
Which classification of plant diseases spreads through the soil and can infect roots?
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Which disease typically infects the entire plant body rather than a specific part?
Which disease typically infects the entire plant body rather than a specific part?
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Which type of disease is disseminated through wind?
Which type of disease is disseminated through wind?
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Which of the following is NOT a classification based on the symptom of plant diseases?
Which of the following is NOT a classification based on the symptom of plant diseases?
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What is a common characteristic of water borne diseases?
What is a common characteristic of water borne diseases?
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Which type of plant disease cannot be transmitted between plants?
Which type of plant disease cannot be transmitted between plants?
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What is a common cause of non-infectious diseases in plants?
What is a common cause of non-infectious diseases in plants?
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Which of the following is an example of an infectious disease?
Which of the following is an example of an infectious disease?
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Animate diseases are primarily caused by which of the following?
Animate diseases are primarily caused by which of the following?
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How are non-infectious diseases often characterized?
How are non-infectious diseases often characterized?
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What type of injury is caused by unfavorable oxygen conditions in plants?
What type of injury is caused by unfavorable oxygen conditions in plants?
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Which of the following diseases is specifically related to a deficiency of boron?
Which of the following diseases is specifically related to a deficiency of boron?
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Which of the following options is NOT a component of plant disease classification?
Which of the following options is NOT a component of plant disease classification?
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Study Notes
Plant Disease Classification
- Plant diseases are classified based on various factors like causal agents, spread, severity, host part affected, and symptoms.
Classification Based on Causes
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Non-infectious diseases (inanimate): Not caused by living organisms, rather by environmental or physiological problems. Examples include freezing injury, heat injury, and nutrient deficiencies. These aren't contagious, as they're caused by environmental factors and aren't transmittable.
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Infectious diseases (animate): Caused by living organisms (bacteria, fungi, viruses, etc.). These can spread from diseased to healthy plants.
Classification Based on Spread and Severity
- Endemic diseases: Confined to a specific region or area, consistently occurring with varying intensity.
- Epidemic/Epiphytotic diseases: Widespread and severe, affecting large plant populations. They occur periodically.
- Sporadic diseases: Occur irregularly and affect only a small number of plants, randomly.
Classification Based on Host Part Affected
- Localized diseases: Affect a specific part of the plant (roots, stems, leaves, etc.).
- Systemic diseases: Affect the entire plant body.
Classification Based on Perpetuation and Dispersal
- Seed-borne diseases: Carried within the seed or attached to it. They can affect the whole plant on germination.
- Soil-borne diseases: Propagated through the soil. Pathogens survive in the soil, infecting roots.
- Water-borne diseases: Spread through water.
- Air-borne diseases: Spread by wind, carrying pathogens through the air.
Classification Based on Symptoms
- Diseases are also categorized based on noticeable symptoms like leaf spots, blights, wilts, rots, etc.
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Description
Test your knowledge on the classification of plant diseases based on causes, spread, and severity. Understand the differences between infectious and non-infectious diseases, as well as endemic, epidemic, and sporadic diseases. Perfect for students studying plant pathology or agriculture.
