PCA - Plant Pathogens Exam 2026 Question
and Answer | Complete Study Guide | A+
Verified
• plant pathogens can be -✓✓a factor in integrated pest management for
controlling insects and mites
• powdery mildews are caused by -✓✓funguses
• which of the following is a sign of a disease -✓✓white mycelium on
twigs and fruit
• some abiotic factors that cause plant disease are -✓✓air pollutants
• which of the following biotic factors contribute to plant diesease -
✓✓viroids and viruses
• a non obliate parasite -✓✓can live on either a living or a dead hosts
• kotch postulates are readily implemented for -✓✓fungi
• an example of human impact in the development in plant disease is -
✓✓the use of preventative fungicide applications
• anthracnose diseases cannot occur without -✓✓the presence of the
pathogen in the soil
• the use of pathogen free propagated material -✓✓only helps if
environmental conditions favorable for disease development are not
present
, • plant disease triangle is used for the diagnosis because it allows you to
discount disease that -✓✓wounldn't occur under existing environmental
conditions
• which of the following factors affects epidemics -✓✓the virulence of
the pathogens
• dominant environmental factor in development in most epidemics
caused by fungi is -✓✓moisture
• in addition to host pathogen and environment another component that
affects the development of an epidemic is -✓✓the age of the host plants
• which type of pathogen decimation method is responsible for most
frequent and most wide spread plant disease epidemics -✓✓air borne
• most soil born diseases are -✓✓single cycled diseases
• serious epidemics are more likely to occur from a multiple cycled
disease rather than a single cycled disease because -✓✓multiple cycled
diseases produce secondary inoculum that can cause secondary
infections
• sanitation practices are often a more effective management tool for
single cycled diseases then multi cycled diseases because -✓✓in a
single cycled disease the primary incoculum is the only inocuclum
available for the entire season
• a race of a pathogen refers to -✓✓a group of pathogens within a
species that infects only certain varieties of a host plant
• the time between host penetration and the first appearance of
symptoms is called the -✓✓incubation period
and Answer | Complete Study Guide | A+
Verified
• plant pathogens can be -✓✓a factor in integrated pest management for
controlling insects and mites
• powdery mildews are caused by -✓✓funguses
• which of the following is a sign of a disease -✓✓white mycelium on
twigs and fruit
• some abiotic factors that cause plant disease are -✓✓air pollutants
• which of the following biotic factors contribute to plant diesease -
✓✓viroids and viruses
• a non obliate parasite -✓✓can live on either a living or a dead hosts
• kotch postulates are readily implemented for -✓✓fungi
• an example of human impact in the development in plant disease is -
✓✓the use of preventative fungicide applications
• anthracnose diseases cannot occur without -✓✓the presence of the
pathogen in the soil
• the use of pathogen free propagated material -✓✓only helps if
environmental conditions favorable for disease development are not
present
, • plant disease triangle is used for the diagnosis because it allows you to
discount disease that -✓✓wounldn't occur under existing environmental
conditions
• which of the following factors affects epidemics -✓✓the virulence of
the pathogens
• dominant environmental factor in development in most epidemics
caused by fungi is -✓✓moisture
• in addition to host pathogen and environment another component that
affects the development of an epidemic is -✓✓the age of the host plants
• which type of pathogen decimation method is responsible for most
frequent and most wide spread plant disease epidemics -✓✓air borne
• most soil born diseases are -✓✓single cycled diseases
• serious epidemics are more likely to occur from a multiple cycled
disease rather than a single cycled disease because -✓✓multiple cycled
diseases produce secondary inoculum that can cause secondary
infections
• sanitation practices are often a more effective management tool for
single cycled diseases then multi cycled diseases because -✓✓in a
single cycled disease the primary incoculum is the only inocuclum
available for the entire season
• a race of a pathogen refers to -✓✓a group of pathogens within a
species that infects only certain varieties of a host plant
• the time between host penetration and the first appearance of
symptoms is called the -✓✓incubation period
