PCA - Plant Pathogens Latest Questions with Correct Solutions

PCA - Plant Pathogens Latest Questions with
Correct Solutions


Three components of disease triangle - Correct Answer-Causal agent,
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| environment, host |




Role of each component of disease triangle - Correct Answer-All three must
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| be present for disease to occur. Environment must favor causal agent. Host
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| must favor causal agent.
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How humans impact each component of disease triangle - Correct Answer-
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| Manipulate the environment, host-plant resistance,
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| preventative/suppressive/erradicative pesticides |




Impact of epidemic when one component of disease triangle does not come
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| into contact with the other two components - Correct Answer-Slows
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| epidemic to a halt. Disease spread needs all three components interacting
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Management strategy to break environment component - Correct Answer-
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| Alter planting dates, remove alternative hosts, alter harvest
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,Plant Disease Definition - Correct Answer-Abnormal physiological
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| processes caused by a causal pathogen| | | | |




Economic significance of plant diseases - Correct Answer-Losses of yield,
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| crops, inputs, land
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Pathogen - Correct Answer-Causal agent of disease
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Signs of disease - Correct Answer-Structures of the pathogen
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Symptoms of disease - Correct Answer-Plant response to pathogen infection
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Abiotic factors of plant disease - Correct Answer-Air pollution, temperature,
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| nutrients




Biotic factors of plant disease - Correct Answer-Living organisms (fungi,
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| bacteria, viruses) |

,Obligate parasite - Correct Answer-unable to grow outside of a living host
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Facultative saprophyte - Correct Answer-prefers living organic matter as a
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| source of nutrition but can adapt to the use of dead organic matter under
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| certain conditions
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Facultative parasite - Correct Answer-A pathogen that prefers dead
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| inorganic material, but can also obtain nourishment from living organic
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| material




Biotroph - Correct Answer-Any parasite that cannot survive in a dead host
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| and therefore keeps it alive
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Necrotroph - Correct Answer-Parasite that kills host cells
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Koch's Postulates - Correct Answer-series of guidelines used to identify the
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| microorganism that causes a specific disease | | | | |




Management strategy to break host component - Correct Answer-Alternate
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| crop, host-plant resistance
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, Management strategy to break causal agent component - Correct Answer-
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| Pesticide applications|




How can knowledge of plant disease triangle be used in diagnosis? - Correct
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| Answer-Can rule out different pathogens based on host and environment.
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Epidemiology - Correct Answer-Branch of medical science concerned with
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| the incidence, distribution, and control of diseases that affect large numbers
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| of people.
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Environmental factors that affect epidemics - Correct Answer-Temperature,
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| humidity, moisture, soil ph, nutrient availability, air movement
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Importance of time in the development of an epidemic - Correct Answer-
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| Epidemics develop very quickly if conditions are favorable. It is critical to
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| reduce the rate of infection during susceptible life stages of the plant
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