Heteroecious

A heteroecious parasiteis one that requires at least two hosts. The primary host is the host in which the parasite spends its adult life; the other is the secondary host.

Heteroecious parasites include:

• Gymnosporangium (Juniper-apple rust); the juniperis the primary host and the apple, pearor hawthornis secondary.
• Cronartium ribicola(White pine blister rust); the primary host are white pines, and currantsthe secondary.

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It uses material from the http://en.wikipedia.org/wiki/Heteroecious Wikipedia article Heteroecious.