The Oak Tree Pathogen Phytophthora Ramorum Has Migrated 800 Km

question 26

Multiple Choice

The oak tree pathogen Phytophthora ramorum has migrated 800 km in 15 years. West Nile virus spread from New York State to 46 other states in 5 years. The difference in the rate of spread is probably related to

• A) the lethality of each pathogen.
• B) the mobility of their hosts.
• C) the fact that viruses are very small.
• D) innate resistance.
• E) dormancy viability.

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