lab_quiz4 - Copy

lab_quiz4 - Copy - How does it apply to Dutch Elm Disease?...

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Lab Quiz #4 Name_____________ Date_________ Section_____________ 1. (2 pts) Dutch Elm Disease (DED) and Chestnut Blight are caused by exotic pathogens. What is an exotic pathogen? An exotic pathogen is a pathogen that is not native to an area. 2. (2 pts) Why did the DED pathogen cause such devastating epidemics? (Hint: evolution and susceptibility) Because the dutch elms had not been exposed to the disease they had not developed a resistance to it. This caused them to be more susceptible to the disease. 3. (2 pts) What vectors Ophiostoma ulmi , the pathogen causing DED? (1 pt) How did the vector type affect disease spread and ultimate Elm tree populations? (1 pt) The elm bark beetles and root grafts are the vectors that cause DED. Diseased elm root cuttings were planted which introduced the infecting into many new areas. The elm bark beetles also infect other hosts in the area. 4. (2 pts) What is “sanitation”?
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Unformatted text preview: How does it apply to Dutch Elm Disease? Sanitation includes insecticidal sprays and the removal of old or weak wood where elm bark beetles breed. Infected trees should be removed from the area to prevent infected through root grafts. DED can be controlled by decreasing the susceptibility of the elm trees in an area by these sanitation practices. 5. (2 pts) In your opinion, what significant consequences resulted from the introduction of Cryphonectria parasitica , the causal organism of Chestnut Blight, into the American forests? The American chestnut has nearly been eliminated from the eastern hardwood forests. Bonus (1 pt): How is hypovirulence utilized as a control of Chestnut Blight? Hypovirulence is the practice of inoculating a lethal canker on a chestnut with a blight fungus that is nonlethal. This practice allows the tree to form bark-callus tissue and heal over the original canker....
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lab_quiz4 - Copy - How does it apply to Dutch Elm Disease?...

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