PCA - Plant Pathogens Latest Questions with
Correct Solutions| Already Graded A| Ace Your
Grades.
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| Already Graded A| Ace Your
Grades.
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
