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what is the oldest plant pathogen known? when is it from?
- wheat rust, 1300 BCE
- biotroph
- airborne
- requires moisture
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What did Aristotle do for pathology?
described crop devistation and attributed it to warm vapors
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What did Theophrastus do for pathology?
Meticulous description of rust disease and noticed it was common in legumes and cereals.
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when was ergotism linked to rye? by whom?
Thuillier in 1670, fungus discovered in 1853 by Tuslane
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The dawn of microbiology:
Who defined animacules
who defined cells
- Van Leeuwenhoek
- Robert Hook
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Who disproved the sopntaneous generation of bacteria? Describe his experiment
- Louis Pasteur (1870)
- Boiled nutrient broth, covered one with a filter one with no filter and one with a long curved tube, only the uncovered one grew germs.
- hypothesised that spores blew in on dust.
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Who was Robert Koch?
He isolated anthrax bacteria from blood in cattle
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What are the 4 Koch's postulates
- 1. Organism is foind in diseased, but not healthy hosts
- 2. Isolate the organism in pure culture
- 3. Culture causes disease when introduced into a healthy host
- 4. same organism can be isolated from second host.
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What disease was the first proven by Koch's postulates?
Late blight of potatoes
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Who proved wheat rust with koch's postulates? and also proved wheat rust?
Anton De Bary
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What are the general steps, in order, of the diesase cycle?
- 1. inoculation
- 2. attachment
- 3. penetration
- 4. infection
- 5. colonization & growth
- 6. reproduction & insemination
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Define Inoculation
introduction of pathogen onto susceptible tissue
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What is a primary inoculum vs a secondary inoculum?
- primary- produced on a dormant structure that survives the unfavorable season (starts initial infections)
- secondary- continues to infect throughout the growing season
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