Exotic Invasives in Asia

John Grehan jrg13 at psu.edu
Wed Sep 16 22:13:07 EDT 1998

Liz Day  wrote

>I didn't realize the monarch was an exotic pest anywhere.  It is?  How in
>the world did it get to the south Pacific??!
>And if the migratory one naturally invaded S. Am. on its own, can this
>really be called havoc?

The monarch has been in the south pacific for a long time. In New Zealand
it never
established until European colonists introduced one of the host-plants
(called swan plant, but I don't know the scientific name), presumably
sometime in the 1800's. Its not a pest in New Zealand so far as I am aware.

Sincerely, John Grehan

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