Invasive species have been known to cause problems in many areas. The most well known is probably the cane toad incident in Australia, when cane toads were imported to kill off beetles that were ruining sugar cane fields. Instead, the toads ate everything else in sight. To this day, they remain a problem in Australia.
However, this is not the only incident. Balsam woolly adelgids accidently imported from Europe reached the United States and killed a large number of fir trees. Exotic microbes brought papaya ringspot virus to crops in Hawaii, devastating a large number of the population, many of whom relyed only on one crop. Civets from Africa and the East Indies spread SARS.
Now, ash borers have become a major problem. These emerald bugs were accidently imported from China and have already killed more than 20 million ash trees. They can bring changes in the environment and a decreased number of forest products. They have no natural enemies in the US.
The only possible solution that has come up is bringing in Chinese wasps that kill ash borers while they are larvae. This situation may end up similar to the cane toads in Australia, or it may bring the result we need.
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