Are they killing the invasive salt cedar (tamarisk) too rapidly?
The Salt Lake Tribune has an alarming story how the beetle Diorhabda elongata , native to Kazakhstan and introduced recently to kill tamarisk, is doing it too rapidly. This is because there is apparently no plan to restore the native riparian vegetation the tamarisk crowded out years ago.
While this may be true, I am not convinced that the rapid elimination of the salt cedar is a bad thing. It has taken over thousands of miles of the rare riparian areas of the Southwest.
Pest-control beetle turning into pest? Environment » U. study document rapid defoliation caused by bug brought to control invasive tamarisk plant. By Brian Maffly. The Salt Lake Tribune.
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It should be noted that there are countless examples of plants, animals, and insects introduced to control foreign invaders becoming as bad as what they were intended to kill. I would venture to say there are almost always unintended side-effects, but there have been successes too.