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20 Cards in this Set
- Front
- Back
Draw the disease triangle.
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you must have all 3 to have a plant disease
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What is the importance of plant diseases?
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1) reduces quantity and quality of plant produce
2) limits the kinds of plants and area industries 3) makes plants poisonous to humans and animals 4) causes financial losses |
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What is the geographic impact of plant disease?
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Africa has the highest impact with almost 50% of produce lost, with Asia second, then S. America
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What is plant pathology?
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pathos=suffering
logos=study of |
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What is plant disease?
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The series of invisible and visible responses of plant cells and tissues to a pathogenic organism or environmental factor that result in adverse changes in the form, function or integrity of the plant and may lead to a partial impairment or death of plant parts or entire plant
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What is a symptom?
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indication of disease by a reaction of host
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What is a sign?
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indication of disases from the direct observation of a pathogen or its parts
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What are some biotic causes of plant diseases?
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fungi, bacteria, viruses and viroids, nematodes, protozoa
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What are some abiotic causes of plant diseases?
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heat, drought, mineral toxicities, nutritional deficiencies, excess moisture
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What are examples of symptoms?
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root rot, gall, wilt, leaf spot, lesion, canker, blight
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What are examples of signs?
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Fungi--mycelium, spores, sclerotia
Bacteria--ooze Nematode--eggs, juveniles, adults Viruses--inclusions, virus particles |
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What are Koch's postulates?
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1. Suspect causal agent must be present in all diseased specimen.
2. Isolate pathogen. 3. Inoculate healthy host. 4. Reisolate. |
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Explain 3 past plant disease epidemics.
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1) Rust epidemic-rust on wheat and barley in 2000-700 BC and people offered prayers and sacrifices for it to end.
2) Ergot epidemics-on rye, caused hallucinations, Salem witch trials, St. Anthony's Fire 3) Chestnut blight 3) |
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List 3 current plant disease epidemics.
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1) sudden oak death
2) citrus canker 3) lethal yellowing of coconut palms |
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What was spontaneous generation?
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microorganisms and their spores were the result rather than the cause of disease
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Who was Anton deBary?
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Father of Plant Pathology b/c he proved that potato late blight was caused by a fungus
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What is the germ theory?
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microorganisms were produced from pre-existing microorganisms and that most infectious diseases were caused by germs
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Who created the germ theory of disease?
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Louis Pasteur
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Who developed artificial media for culturing microorganisms?
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Petri
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What did Koch do?
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Established the postulates for demonstrating that a microorganism was the cause of a particulat disease using Anthrax bacilli
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