Which of the following correctly describes the difference between a primary pathogen and an opportunistic pathogen in forest disease ecology?
-
A
Primary pathogens attack roots while opportunistic pathogens attack foliage
-
B
Primary pathogens can infect and kill vigorous, healthy trees, while opportunistic pathogens typically only cause serious damage to stressed or weakened trees
-
C
Primary pathogens are exotic introductions while opportunistic pathogens are native species
-
D
Primary pathogens are soilborne while opportunistic pathogens are airborne