PCA - Plant Pathogens Latest Questions with
Correct Solutions
Three components of disease triangle - Correct Answer-Causal agent,
| | | | | | | |
| environment, host |
Role of each component of disease triangle - Correct Answer-All three must
| | | | | | | | | | |
| be present for disease to occur. Environment must favor causal agent. Host
| | | | | | | | | | |
| must favor causal agent.
| | |
How humans impact each component of disease triangle - Correct Answer-
| | | | | | | | | |
| Manipulate the environment, host-plant resistance,
| | | |
| preventative/suppressive/erradicative pesticides |
Impact of epidemic when one component of disease triangle does not come
| | | | | | | | | | |
| into contact with the other two components - Correct Answer-Slows
| | | | | | | | |
| epidemic to a halt. Disease spread needs all three components interacting
| | | | | | | | | |
Management strategy to break environment component - Correct Answer-
| | | | | | | |
| Alter planting dates, remove alternative hosts, alter harvest
| | | | | | |
,Plant Disease Definition - Correct Answer-Abnormal physiological
| | | | | |
| processes caused by a causal pathogen| | | | |
Economic significance of plant diseases - Correct Answer-Losses of yield,
| | | | | | | | |
| crops, inputs, land
| |
Pathogen - Correct Answer-Causal agent of disease
| | | | | |
Signs of disease - Correct Answer-Structures of the pathogen
| | | | | | | |
Symptoms of disease - Correct Answer-Plant response to pathogen infection
| | | | | | | | |
Abiotic factors of plant disease - Correct Answer-Air pollution, temperature,
| | | | | | | | |
| nutrients
Biotic factors of plant disease - Correct Answer-Living organisms (fungi,
| | | | | | | | |
| bacteria, viruses) |
,Obligate parasite - Correct Answer-unable to grow outside of a living host
| | | | | | | | | | |
Facultative saprophyte - Correct Answer-prefers living organic matter as a
| | | | | | | | |
| source of nutrition but can adapt to the use of dead organic matter under
| | | | | | | | | | | | |
| certain conditions
|
Facultative parasite - Correct Answer-A pathogen that prefers dead
| | | | | | | |
| inorganic material, but can also obtain nourishment from living organic
| | | | | | | | |
| material
Biotroph - Correct Answer-Any parasite that cannot survive in a dead host
| | | | | | | | | | |
| and therefore keeps it alive
| | | |
Necrotroph - Correct Answer-Parasite that kills host cells
| | | | | | |
Koch's Postulates - Correct Answer-series of guidelines used to identify the
| | | | | | | | | |
| microorganism that causes a specific disease | | | | |
Management strategy to break host component - Correct Answer-Alternate
| | | | | | | |
| crop, host-plant resistance
| |
, Management strategy to break causal agent component - Correct Answer-
| | | | | | | | |
| Pesticide applications|
How can knowledge of plant disease triangle be used in diagnosis? - Correct
| | | | | | | | | | | |
| Answer-Can rule out different pathogens based on host and environment.
| | | | | | | | |
Epidemiology - Correct Answer-Branch of medical science concerned with
| | | | | | | |
| the incidence, distribution, and control of diseases that affect large numbers
| | | | | | | | | |
| of people.
|
Environmental factors that affect epidemics - Correct Answer-Temperature,
| | | | | | |
| humidity, moisture, soil ph, nutrient availability, air movement
| | | | | | |
Importance of time in the development of an epidemic - Correct Answer-
| | | | | | | | | | |
| Epidemics develop very quickly if conditions are favorable. It is critical to
| | | | | | | | | | |
| reduce the rate of infection during susceptible life stages of the plant
| | | | | | | | | | |
Correct Solutions
Three components of disease triangle - Correct Answer-Causal agent,
| | | | | | | |
| environment, host |
Role of each component of disease triangle - Correct Answer-All three must
| | | | | | | | | | |
| be present for disease to occur. Environment must favor causal agent. Host
| | | | | | | | | | |
| must favor causal agent.
| | |
How humans impact each component of disease triangle - Correct Answer-
| | | | | | | | | |
| Manipulate the environment, host-plant resistance,
| | | |
| preventative/suppressive/erradicative pesticides |
Impact of epidemic when one component of disease triangle does not come
| | | | | | | | | | |
| into contact with the other two components - Correct Answer-Slows
| | | | | | | | |
| epidemic to a halt. Disease spread needs all three components interacting
| | | | | | | | | |
Management strategy to break environment component - Correct Answer-
| | | | | | | |
| Alter planting dates, remove alternative hosts, alter harvest
| | | | | | |
,Plant Disease Definition - Correct Answer-Abnormal physiological
| | | | | |
| processes caused by a causal pathogen| | | | |
Economic significance of plant diseases - Correct Answer-Losses of yield,
| | | | | | | | |
| crops, inputs, land
| |
Pathogen - Correct Answer-Causal agent of disease
| | | | | |
Signs of disease - Correct Answer-Structures of the pathogen
| | | | | | | |
Symptoms of disease - Correct Answer-Plant response to pathogen infection
| | | | | | | | |
Abiotic factors of plant disease - Correct Answer-Air pollution, temperature,
| | | | | | | | |
| nutrients
Biotic factors of plant disease - Correct Answer-Living organisms (fungi,
| | | | | | | | |
| bacteria, viruses) |
,Obligate parasite - Correct Answer-unable to grow outside of a living host
| | | | | | | | | | |
Facultative saprophyte - Correct Answer-prefers living organic matter as a
| | | | | | | | |
| source of nutrition but can adapt to the use of dead organic matter under
| | | | | | | | | | | | |
| certain conditions
|
Facultative parasite - Correct Answer-A pathogen that prefers dead
| | | | | | | |
| inorganic material, but can also obtain nourishment from living organic
| | | | | | | | |
| material
Biotroph - Correct Answer-Any parasite that cannot survive in a dead host
| | | | | | | | | | |
| and therefore keeps it alive
| | | |
Necrotroph - Correct Answer-Parasite that kills host cells
| | | | | | |
Koch's Postulates - Correct Answer-series of guidelines used to identify the
| | | | | | | | | |
| microorganism that causes a specific disease | | | | |
Management strategy to break host component - Correct Answer-Alternate
| | | | | | | |
| crop, host-plant resistance
| |
, Management strategy to break causal agent component - Correct Answer-
| | | | | | | | |
| Pesticide applications|
How can knowledge of plant disease triangle be used in diagnosis? - Correct
| | | | | | | | | | | |
| Answer-Can rule out different pathogens based on host and environment.
| | | | | | | | |
Epidemiology - Correct Answer-Branch of medical science concerned with
| | | | | | | |
| the incidence, distribution, and control of diseases that affect large numbers
| | | | | | | | | |
| of people.
|
Environmental factors that affect epidemics - Correct Answer-Temperature,
| | | | | | |
| humidity, moisture, soil ph, nutrient availability, air movement
| | | | | | |
Importance of time in the development of an epidemic - Correct Answer-
| | | | | | | | | | |
| Epidemics develop very quickly if conditions are favorable. It is critical to
| | | | | | | | | | |
| reduce the rate of infection during susceptible life stages of the plant
| | | | | | | | | | |
