PCA-PLANT PATHOGENS PRACTICE EXAM QUESTIONS AND ANSWERS 2025|WELL
STRUCTURED|100% PASS
QUESTIONS ANSWERS
a factor in integrated pest management
Plant pathogens can be
for controlling insects and mites
Abnormal growth and/or dysfunction of a
Define plant disease? plant, which can be caused by bacteria,
fungi or viruses
What are the four types of pathogens? Viruses, Bacteria, Fungi, and Parasites.
What is the difference between a A pathogen is any organism that causes
pathogen and a disease? disease.
Powdery mildews are caused by? Funguses
What are some abiotic factors that cause Weather, soils, chemical, or mechanical
plant disease? injuries.
What are some biotic factors that cause Fungi, bacteria, viruses, nematodes, i.e,
plant disease? anything living.
which of the following is a sign of a dis-
white mycelium on twigs and fruit
ease
some abiotic factors that cause plant dis-
air pollutants
ease are
which of the following biotic factors con-
viroids and viruses
tribute to plant diesease
Capable of existing in varying environ-
What does the term facultative refer to?
ments.
An organism that may resort to parasitic
Facultative parasites: activity, but does not absolutely rely on
any host for completion of its life cycle.
Must spend at least some of their life
Obligate parasites:
cycle in or on a host.
Prefers living organic matter as a source
of nutrition but can adapt to the use of
Facultative saprophyte
dead organic matter under certain con-
ditions.
a non obliate parasite can live on either a living or a dead hosts
List Koch's postulates and describe how
to use them.
, PCA-PLANT PATHOGENS PRACTICE EXAM QUESTIONS AND ANSWERS 2025|WELL
STRUCTURED|100% PASS
QUESTIONS ANSWERS
1. Find suspect agent in every case of
disease of interest but not in healthy
hosts.
2. Isolate and culture suspect agent in
the laboratory.
3. Inoculate suspect agent into test sub-
ject and observe that subject develops
disease of interest.
4. Recover and isolate suspect agent
from the test subject.
Give an example of a Single Annual,
Anthracnose, single generation per year.
Monocyclic disease?
Give an example of a Polycyclic dis- Powdery Mildew, multiple generations
ease? per year.
an example of human impact in the de- the use of preventative fungicide applica-
velopment in plant disease is tions
anthracnose diseases cannot occur
the presence of the pathogen in the soil
without
only helps if environmental conditions fa-
the use of pathogen free propagated ma-
vorable for disease development are not
terial
present
Late blight of potato
Phytophthora sp. (Oomycetes)
plant disease triangle is used for the
wounldn't occur under existing environ-
diagnosis because it allows you to dis-
mental conditions
count disease that
Apple Scab
Venturia sp. (Ascomycetes)
Rhizopus sp. (Zygomycetes) Soft Rot
STRUCTURED|100% PASS
QUESTIONS ANSWERS
a factor in integrated pest management
Plant pathogens can be
for controlling insects and mites
Abnormal growth and/or dysfunction of a
Define plant disease? plant, which can be caused by bacteria,
fungi or viruses
What are the four types of pathogens? Viruses, Bacteria, Fungi, and Parasites.
What is the difference between a A pathogen is any organism that causes
pathogen and a disease? disease.
Powdery mildews are caused by? Funguses
What are some abiotic factors that cause Weather, soils, chemical, or mechanical
plant disease? injuries.
What are some biotic factors that cause Fungi, bacteria, viruses, nematodes, i.e,
plant disease? anything living.
which of the following is a sign of a dis-
white mycelium on twigs and fruit
ease
some abiotic factors that cause plant dis-
air pollutants
ease are
which of the following biotic factors con-
viroids and viruses
tribute to plant diesease
Capable of existing in varying environ-
What does the term facultative refer to?
ments.
An organism that may resort to parasitic
Facultative parasites: activity, but does not absolutely rely on
any host for completion of its life cycle.
Must spend at least some of their life
Obligate parasites:
cycle in or on a host.
Prefers living organic matter as a source
of nutrition but can adapt to the use of
Facultative saprophyte
dead organic matter under certain con-
ditions.
a non obliate parasite can live on either a living or a dead hosts
List Koch's postulates and describe how
to use them.
, PCA-PLANT PATHOGENS PRACTICE EXAM QUESTIONS AND ANSWERS 2025|WELL
STRUCTURED|100% PASS
QUESTIONS ANSWERS
1. Find suspect agent in every case of
disease of interest but not in healthy
hosts.
2. Isolate and culture suspect agent in
the laboratory.
3. Inoculate suspect agent into test sub-
ject and observe that subject develops
disease of interest.
4. Recover and isolate suspect agent
from the test subject.
Give an example of a Single Annual,
Anthracnose, single generation per year.
Monocyclic disease?
Give an example of a Polycyclic dis- Powdery Mildew, multiple generations
ease? per year.
an example of human impact in the de- the use of preventative fungicide applica-
velopment in plant disease is tions
anthracnose diseases cannot occur
the presence of the pathogen in the soil
without
only helps if environmental conditions fa-
the use of pathogen free propagated ma-
vorable for disease development are not
terial
present
Late blight of potato
Phytophthora sp. (Oomycetes)
plant disease triangle is used for the
wounldn't occur under existing environ-
diagnosis because it allows you to dis-
mental conditions
count disease that
Apple Scab
Venturia sp. (Ascomycetes)
Rhizopus sp. (Zygomycetes) Soft Rot
