Thursday, October 18, 2012
What once was most unusual can turn into threatening pest
Exotic — also called “invasive” — species are nothing new. A variety of animals and plants has been introduced to North America in the 500-plus years that the continent has been explored, settled and developed.
Some were introduced on purpose, others by accident. These introduced species are collectively known as “exotic” species because they’re not indigenous to North America. The opposite of exotic is “native.” Native species are the plants and animals that were the original inhabitants of our landscape.
Some exotic plants such as kudzu and fescue are well-known to people, but there are many others. Some have become so common that we don’t realize they’re not from around here.
Take, for instance, the two most common types of crabgrass found in Midwestern yards (and the types you’re probably trying to get rid of in yours) — hairy crabgrass (Digitaria sanguinalis) and smooth crabgrass (Digitaria ischaemum). Neither is native to North America: They were introduced here, probably in the 19th century.
On the animal side, zebra mussels and Asian carp are highly publicized exotics that have made the news as threats to aquatic habitats in parts of the United States.
Gypsy moths and emerald ash borers are well-known non-native tree pests that pose both habitat and financial threats to forests in the eastern and central parts of the country.
One of our less-publicized exotic animals is the house mouse (Mus musculus).
This common pest, which is the mouse species we commonly encounter in homes and other domestic dwellings, wasn’t here when Europeans arrived. It had numerous introductions to North America via the ships of explorers and colonists.
Though the exotic species that have come here are varied, the reasons they’ve become abundant are similar: Exotic species were introduced into areas that had none of the natural controls (browsing animals, predators, harsher weather, etc.) that kept them in line in their native lands, and, as a result, these newcomers flourished.
This abundance has often come at the expense of native plants that formed the foundation of our habitats.
When exotic species invade an area and crowd out the plants and animals that occurred naturally in that location, habitats often change for the worse: The insects that were attracted to native flowers go elsewhere, the native birds can’t find nesting areas because they’re occupied by exotic birds and other animals that needed these species for some part of their life cycles are also negatively affected.
Wise conservation practices using native species pay by enriching our economy and quality of life. Conversely, exotic invasions can have negative financial repercussions.
Gypsy moths and emerald ash borers are already having an effect on the timber industry. When exotic plants such as musk thistle, spotted knapweed or Johnson grass take over pastures and fields, they can turn what had been money-making acres into financially unproductive tracts of land.
As always Servall Termite & Pest Control is here for all of your pest control and home repair needs. Contact us today at one of our four convenient locations or visit http://www.servallpestcontrol.com!