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Questions and Answers
What is an example of a sign of a plant disease?
What is an example of a sign of a plant disease?
- Wilts
- Deficiency diseases
- Chemical factors
- Mycelia (correct)
Which of the following is not a cause of plant diseases?
Which of the following is not a cause of plant diseases?
- Insects
- Fungi
- Nematodes
- Abiotic factors (correct)
What type of plant disease is caused by non-living factors?
What type of plant disease is caused by non-living factors?
- Abiotic (correct)
- Infectious
- Biotic
- Parasitic
What is an example of a plant disease symptom?
What is an example of a plant disease symptom?
Which of the following is not a type of plant disease based on the causal agent?
Which of the following is not a type of plant disease based on the causal agent?
What is the difference between biotic and abiotic causes of plant diseases?
What is the difference between biotic and abiotic causes of plant diseases?
What is the main definition of plant pathology?
What is the main definition of plant pathology?
What are the major objectives of plant pathology?
What are the major objectives of plant pathology?
Which of the following is an example of a plant disease that had a significant impact on society?
Which of the following is an example of a plant disease that had a significant impact on society?
How did the coffee rust disease impact human food habits?
How did the coffee rust disease impact human food habits?
Which of the following forest tree diseases caused great economic losses in America?
Which of the following forest tree diseases caused great economic losses in America?
What is the main reason for studying plant diseases?
What is the main reason for studying plant diseases?
What caused the Irish potato famine in the mid-1800s?
What caused the Irish potato famine in the mid-1800s?
What is a symptom of a plant disease?
What is a symptom of a plant disease?
Which of the following is an example of a plant disease symptom?
Which of the following is an example of a plant disease symptom?
How can plant pathogens interfere with plant physiology?
How can plant pathogens interfere with plant physiology?
What is the difference between a symptom and a sign of a plant disease?
What is the difference between a symptom and a sign of a plant disease?
Why was the Irish population at risk of famine in the mid-1800s?
Why was the Irish population at risk of famine in the mid-1800s?
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Study Notes
Signs and Symptoms of Plant Diseases
- A sign is the visible presence of the pathogen, such as a fruiting body or discharge associated with the disease
- Examples of signs: Mycelia masses of fungal threads, Pycnidia minute fungal asexual fruiting structures, Rhizomorphs oozing mass of juices composed of host and parasite substances
Causes of Plant Diseases
- Living (biotic) factors: infectious, include pathogens (fungi, nematodes, bacteria, and viruses), insects, and other animals
- Non-living (abiotic) factors: non-infectious, caused by chemical, physical, or mechanical factors
Plant Pathology
- Defined as the study of the nature, cause, and prevention of plant diseases
- Objectives: study biotic and abiotic causes of diseases, mechanisms of disease development, plant-pathogen interaction, and management of plant diseases
Importance of Plant Diseases
- Reduce quality and quantity of plant produce
- Certain diseases have had significant impacts on society, e.g., Phytophthora late blight causing the Irish potato famine in 1845
- Changes agricultural patterns, food habits, and economies
Plant Diseases in History
- Examples: Dutch elm disease, chestnut blight, coffee rust disease
- Historical impact: The Irish potato famine (1845) and changes in food habits
Disease and Symptom Definitions
- Disease: disturbance from plant pathogen or environmental factor that interferes with plant physiology
- Symptom: physical expression of a change in the appearance and function of the plant
- Examples of symptoms: blights, cankers, galls, rots, necrosis, spots
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