The oak tree pathogen that causes sudden oak death, Phytophthora ramorum, has dispersed 800 kilometers in 15 years. West Nile virus spread from New York State to 46 other states in 5 years. Which of the following best explains the difference in the rate of spread of these two pathogens?
A) the lethality of each pathogen
B) the mobility of their hosts
C) the fact that viruses are very small
D) innate resistance

Question

Quizplus · Accepted Answer

The difference in the rate of spread between Phytophthora ramorum and West Nile virus can be attributed to the mobility of their hosts. Phytophthora ramorum spreads through plants, which are stationary, while West Nile virus spreads through birds and mosquitoes, which are highly mobile and can cover large distances quickly.

The Oak Tree Pathogen That Causes Sudden Oak Death, Phytophthora