PCA-PLANT PATHOGENS EXAM-ACTUAL EXAM-
LATEST UPDATE |COMPLETE QUESTIONS WITH
CORRECT DETAILED AND VERIFIED ANSWERS-
MOSTLY TESTED QUESTIONS| RATED 100%
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A+
Plant Disease Definition - ...(ANSWERS)....Abnormal physiological processes
caused by a causal pathogen
Economic significance of plant diseases - ...(ANSWERS)....Losses of yield, crops,
inputs, land
Pathogen - ...(ANSWERS)....Causal agent of disease
Signs of disease - ...(ANSWERS)....Structures of the pathogen
Symptoms of disease - ...(ANSWERS)....Plant response to pathogen infection
Abiotic factors of plant disease - ...(ANSWERS)....Air pollution, temperature,
nutrients
Biotic factors of plant disease - ...(ANSWERS)....Living organisms (fungi, bacteria,
viruses)
,Obligate parasite - ...(ANSWERS)....unable to grow outside of a living host
Facultative saprophyte - ...(ANSWERS)....prefers living organic matter as a source
of nutrition but can adapt to the use of dead organic matter under certain
conditions
Facultative parasite - ...(ANSWERS)....A pathogen that prefers dead inorganic
material, but can also obtain nourishment from living organic material
Biotroph - ...(ANSWERS)....Any parasite that cannot survive in a dead host and
therefore keeps it alive
Necrotroph - ...(ANSWERS)....Parasite that kills host cells
Koch's Postulates - ...(ANSWERS)....series of guidelines used to identify the
microorganism that causes a specific disease
Three components of disease triangle - ...(ANSWERS)....Causal agent,
environment, host
Role of each component of disease triangle - ...(ANSWERS)....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 -
...(ANSWERS)....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 - ...(ANSWERS)....Slows epidemic to a
halt. Disease spread needs all three components interacting
Management strategy to break environment component - ...(ANSWERS)....Alter
planting dates, remove alternative hosts, alter harvest
Management strategy to break host component - ...(ANSWERS)....Alternate crop,
host-plant resistance
Management strategy to break causal agent component -
...(ANSWERS)....Pesticide applications
How can knowledge of plant disease triangle be used in diagnosis? -
...(ANSWERS)....Can rule out different pathogens based on host and environment.
Epidemiology - ...(ANSWERS)....Branch of medical science concerned with the
incidence, distribution, and control of diseases that affect large numbers of
people.
, Environmental factors that affect epidemics - ...(ANSWERS)....Temperature,
humidity, moisture, soil pH, nutrient availability, air movement
Importance of time in the development of an epidemic -
...(ANSWERS)....Epidemics develop very quickly if conditions are favorable. It is
critical to reduce the rate of infection during susceptible life stages of the plant
How does type of reproduction cycle affect development of an epidemic -
...(ANSWERS)....Polycyclic epidemics can develop much more rapidly than
monocyclic epidemics because of secondary inoculum production.
How does dissemination affect development of an epidemic -
...(ANSWERS)....Conditions that increase dissemination will accelerate
development of epidemics
Monocyclic disease - ...(ANSWERS)....Disease that only has a primary infection
cycle
Polycyclic disease - ...(ANSWERS)....Disease that produces a secondary inoculum,
and has a secondary infection cycle in addition to a primary infection cycle
Why are monocyclic diseases less likely to result in serious epidemics? -
...(ANSWERS)....Controlling primary inoculum is much easier than controlling
primary and secondary inoculum. Once primary inoculum is controlled and
dissemination is controlled, the disease essentially stops developing.
LATEST UPDATE |COMPLETE QUESTIONS WITH
CORRECT DETAILED AND VERIFIED ANSWERS-
MOSTLY TESTED QUESTIONS| RATED 100%
CORRECT!! GUARANTEED PASS!! ALREADY GRADED
A+
Plant Disease Definition - ...(ANSWERS)....Abnormal physiological processes
caused by a causal pathogen
Economic significance of plant diseases - ...(ANSWERS)....Losses of yield, crops,
inputs, land
Pathogen - ...(ANSWERS)....Causal agent of disease
Signs of disease - ...(ANSWERS)....Structures of the pathogen
Symptoms of disease - ...(ANSWERS)....Plant response to pathogen infection
Abiotic factors of plant disease - ...(ANSWERS)....Air pollution, temperature,
nutrients
Biotic factors of plant disease - ...(ANSWERS)....Living organisms (fungi, bacteria,
viruses)
,Obligate parasite - ...(ANSWERS)....unable to grow outside of a living host
Facultative saprophyte - ...(ANSWERS)....prefers living organic matter as a source
of nutrition but can adapt to the use of dead organic matter under certain
conditions
Facultative parasite - ...(ANSWERS)....A pathogen that prefers dead inorganic
material, but can also obtain nourishment from living organic material
Biotroph - ...(ANSWERS)....Any parasite that cannot survive in a dead host and
therefore keeps it alive
Necrotroph - ...(ANSWERS)....Parasite that kills host cells
Koch's Postulates - ...(ANSWERS)....series of guidelines used to identify the
microorganism that causes a specific disease
Three components of disease triangle - ...(ANSWERS)....Causal agent,
environment, host
Role of each component of disease triangle - ...(ANSWERS)....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 -
...(ANSWERS)....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 - ...(ANSWERS)....Slows epidemic to a
halt. Disease spread needs all three components interacting
Management strategy to break environment component - ...(ANSWERS)....Alter
planting dates, remove alternative hosts, alter harvest
Management strategy to break host component - ...(ANSWERS)....Alternate crop,
host-plant resistance
Management strategy to break causal agent component -
...(ANSWERS)....Pesticide applications
How can knowledge of plant disease triangle be used in diagnosis? -
...(ANSWERS)....Can rule out different pathogens based on host and environment.
Epidemiology - ...(ANSWERS)....Branch of medical science concerned with the
incidence, distribution, and control of diseases that affect large numbers of
people.
, Environmental factors that affect epidemics - ...(ANSWERS)....Temperature,
humidity, moisture, soil pH, nutrient availability, air movement
Importance of time in the development of an epidemic -
...(ANSWERS)....Epidemics develop very quickly if conditions are favorable. It is
critical to reduce the rate of infection during susceptible life stages of the plant
How does type of reproduction cycle affect development of an epidemic -
...(ANSWERS)....Polycyclic epidemics can develop much more rapidly than
monocyclic epidemics because of secondary inoculum production.
How does dissemination affect development of an epidemic -
...(ANSWERS)....Conditions that increase dissemination will accelerate
development of epidemics
Monocyclic disease - ...(ANSWERS)....Disease that only has a primary infection
cycle
Polycyclic disease - ...(ANSWERS)....Disease that produces a secondary inoculum,
and has a secondary infection cycle in addition to a primary infection cycle
Why are monocyclic diseases less likely to result in serious epidemics? -
...(ANSWERS)....Controlling primary inoculum is much easier than controlling
primary and secondary inoculum. Once primary inoculum is controlled and
dissemination is controlled, the disease essentially stops developing.
