PLPA 2003 EXAM 2 QUESTIONS WITH VERIFIED
ACCURATE ANSWERS
Which of the following statements best describes the result of the Barberry eradication
campaign?
Select one:
A. The program continues to this day with active 4-H involvement
B. It has slowed the development of new pathogen races and allowed resistant wheat
varieties to last longer
C. All of the above/below are correct
D. It has completely prevented wheat stem rust from infecting wheat in the northern part
of the United States
E. Due to the hardiness of the barberry plant it was largely considered a failure -
Answers - B. It has slowed the development of new pathogen races and allowed
resistant wheat varieties to last longer
Which of the following is NOT used as evidence to support the theory that Ergotism
outbreaks led to an increase in witchcraft trials in Europe in the 15th-18th century?
Select one:
1. Tree ring data that indicates years with more witchcraft trials followed conditions that
were conducive to disease
2. Presence of sclerotia in stomachs of those killed for being accused of witchcraft
3. Symptoms of "bewitched" seemed to resemble ergotism symptoms
4. All of the above/below
5. Greater numbers of witchcraft trials in areas that grew more rye - Answers - 2.
Presence of sclerotia in stomachs of those killed for being accused of witchcraft
Which of the following statements about Chestnut Blight disease management is
LEAST correct?
Select one:
A. Hypovirulence based biocontrol uses a very aggressive form of the pathogen to wipe
out alternate hosts of the disease
B. Injecting fungicides is not realistic in large ecosystem settings
C. Mudpacking of chestnut blight cankers is based on the idea that soil microorganisms
antagonize the pathogen
D. Sources of chestnuts with good resistance are found where the pathogen evolved
E. All of the above/below are true - Answers - A. Hypovirulence based biocontrol uses a
very aggressive form of the pathogen to wipe out alternate hosts of the disease
-hypovirulence attacks the pathogen, not the host
-hypovirulence reduces the virulence of the pathogen
ACCURATE ANSWERS
Which of the following statements best describes the result of the Barberry eradication
campaign?
Select one:
A. The program continues to this day with active 4-H involvement
B. It has slowed the development of new pathogen races and allowed resistant wheat
varieties to last longer
C. All of the above/below are correct
D. It has completely prevented wheat stem rust from infecting wheat in the northern part
of the United States
E. Due to the hardiness of the barberry plant it was largely considered a failure -
Answers - B. It has slowed the development of new pathogen races and allowed
resistant wheat varieties to last longer
Which of the following is NOT used as evidence to support the theory that Ergotism
outbreaks led to an increase in witchcraft trials in Europe in the 15th-18th century?
Select one:
1. Tree ring data that indicates years with more witchcraft trials followed conditions that
were conducive to disease
2. Presence of sclerotia in stomachs of those killed for being accused of witchcraft
3. Symptoms of "bewitched" seemed to resemble ergotism symptoms
4. All of the above/below
5. Greater numbers of witchcraft trials in areas that grew more rye - Answers - 2.
Presence of sclerotia in stomachs of those killed for being accused of witchcraft
Which of the following statements about Chestnut Blight disease management is
LEAST correct?
Select one:
A. Hypovirulence based biocontrol uses a very aggressive form of the pathogen to wipe
out alternate hosts of the disease
B. Injecting fungicides is not realistic in large ecosystem settings
C. Mudpacking of chestnut blight cankers is based on the idea that soil microorganisms
antagonize the pathogen
D. Sources of chestnuts with good resistance are found where the pathogen evolved
E. All of the above/below are true - Answers - A. Hypovirulence based biocontrol uses a
very aggressive form of the pathogen to wipe out alternate hosts of the disease
-hypovirulence attacks the pathogen, not the host
-hypovirulence reduces the virulence of the pathogen
