PCA PLANT PATHOGENS ACTUAL FINAL EXAM | WITH COMPLETE
QUESTIONS AND ANSWERS | 2025/2026 LATEST UPDATED | 100 %
RATED AND VERIFIED SOLUTIONS | GET AN A+
plant pathogens can be - (ANSWER)a factor in integrated pest management for controlling
insects and mites
powdery mildews are caused by - (ANSWER)funguses
which of the following is a sign of a disease - (ANSWER)white mycelium on twigs and fruit
some abiotic factors that cause plant disease are - (ANSWER)air pollutants
which of the following biotic factors contribute to plant diesease - (ANSWER)viroids and
viruses
a non obliate parasite - (ANSWER)can live on either a living or a dead hosts
kotch postulates are readily implemented for - (ANSWER)fungi
,an example of human impact in the development in plant disease is - (ANSWER)the use of
preventative fungicide applications
anthracnose diseases cannot occur without - (ANSWER)the presence of the pathogen in the soil
the use of pathogen free propagated material - (ANSWER)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 -
(ANSWER)wounldn't occur under existing environmental conditions
which of the following factors affects epidemics - (ANSWER)the virulence of the pathogens
dominant environmental factor in development in most epidemics caused by fungi is -
(ANSWER)moisture
in addition to host pathogen and environment another component that affects the development of
an epidemic is - (ANSWER)the age of the host plants
,which type of pathogen decimation method is responsible for most frequent and most wide
spread plant disease epidemics - (ANSWER)air borne
most soil born diseases are - (ANSWER)single cycled diseases
serious epidemics are more likely to occur from a multiple cycled disease rather than a single
cycled disease because - (ANSWER)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 - (ANSWER)in a single cycled disease the primary incoculum is
the only inocuclum available for the entire season
a race of a pathogen refers to - (ANSWER)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 -
(ANSWER)incubation period
a mushroom is an example of a - (ANSWER)basidocarp
, most fungal disease that attack flowers are favored by - (ANSWER)wet weather
fungi penetration the host plant by directly penetration of - (ANSWER)open wounds
obligate fungal parasites - (ANSWER)are unable to feed on dead cells
at times it is difficult to determine the casual agent of a disease because various agents result in
similare symptoms. which of the following symptoms are similare - (ANSWER)wilts
(verticillium and fusarium)
bacterial plant pathogens are - (ANSWER)prokaryotes
bacterial canker in tomatoes is commonly spread by all of the following execpt? -
(ANSWER)leaf hoppers
environmental conditions that commonly favor the development of bacterial blights are -
(ANSWER)warm and humid conditions
QUESTIONS AND ANSWERS | 2025/2026 LATEST UPDATED | 100 %
RATED AND VERIFIED SOLUTIONS | GET AN A+
plant pathogens can be - (ANSWER)a factor in integrated pest management for controlling
insects and mites
powdery mildews are caused by - (ANSWER)funguses
which of the following is a sign of a disease - (ANSWER)white mycelium on twigs and fruit
some abiotic factors that cause plant disease are - (ANSWER)air pollutants
which of the following biotic factors contribute to plant diesease - (ANSWER)viroids and
viruses
a non obliate parasite - (ANSWER)can live on either a living or a dead hosts
kotch postulates are readily implemented for - (ANSWER)fungi
,an example of human impact in the development in plant disease is - (ANSWER)the use of
preventative fungicide applications
anthracnose diseases cannot occur without - (ANSWER)the presence of the pathogen in the soil
the use of pathogen free propagated material - (ANSWER)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 -
(ANSWER)wounldn't occur under existing environmental conditions
which of the following factors affects epidemics - (ANSWER)the virulence of the pathogens
dominant environmental factor in development in most epidemics caused by fungi is -
(ANSWER)moisture
in addition to host pathogen and environment another component that affects the development of
an epidemic is - (ANSWER)the age of the host plants
,which type of pathogen decimation method is responsible for most frequent and most wide
spread plant disease epidemics - (ANSWER)air borne
most soil born diseases are - (ANSWER)single cycled diseases
serious epidemics are more likely to occur from a multiple cycled disease rather than a single
cycled disease because - (ANSWER)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 - (ANSWER)in a single cycled disease the primary incoculum is
the only inocuclum available for the entire season
a race of a pathogen refers to - (ANSWER)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 -
(ANSWER)incubation period
a mushroom is an example of a - (ANSWER)basidocarp
, most fungal disease that attack flowers are favored by - (ANSWER)wet weather
fungi penetration the host plant by directly penetration of - (ANSWER)open wounds
obligate fungal parasites - (ANSWER)are unable to feed on dead cells
at times it is difficult to determine the casual agent of a disease because various agents result in
similare symptoms. which of the following symptoms are similare - (ANSWER)wilts
(verticillium and fusarium)
bacterial plant pathogens are - (ANSWER)prokaryotes
bacterial canker in tomatoes is commonly spread by all of the following execpt? -
(ANSWER)leaf hoppers
environmental conditions that commonly favor the development of bacterial blights are -
(ANSWER)warm and humid conditions
