Occasional Invaders

Commonly when the weather starts to cool many insects and rodents in Evansville begin to make their journey to shelter to survive the winter. In the wild, that may be a hollow tree, bark of a tree, leaf litter or other type of natural shelter. Many times the best overwintering sites are in a warm home or commercial structure. In the Evansville, Henderson, Paducah and Owensboro area we primarily experience Asian lady beetles, stink bugs, box elder bugs, cluster flies, overwintering wasps and rodents.
In 1916 the United States introduced the Asian lady beetle for the control of aphids and other plant pests. However, their populations quickly inundated the Evansville and Paducah area due to their very aggressive reproductive capacity. They have outcompeted some of our natural pests such as the ladybird beetle pushing their numbers down and possibly driving them out of existence. With all occasional invaders the most important thing is to seal them out. Most insects use pheromones to communicate with each other. Those communications could be sources of food, reproduction or overwintering. If a Evansville homeowners can eliminate the entry points such as leaky windows and doors it can go a long way in making sure the pest don’t come back to overwinter.
Stink bugs were also introduced into the tri state area in the 1990’s through the transport of food products from China and Korea. Western Kentucky, especially the Paducah area receive a large influx of these insects in the fall as they appear when crop harvesting begins. Being a large farming and rural area the impact from these insects appears to be much more severe as we proceed into colder weather. These insects can be particularly disturbing as they release a pungent odor when disturbed. Even though birds and other insects can consume these invaders their habit of releasing their pungent liquid will deter most predators. As with all occasional invaders the most important thing is to keep them out of the structure. Make sure all doors and windows close tightly. Ensure that all screens are not torn and any access around the foundation is properly sealed.
Another overwintering pest that can release a pungent odor when disturbed is the box elder bug. These insects are also very numerous in the Evansville, Owensboro and Paducah area. They are a relatively small insect about the size of a wasp or smaller with black and red markings. As the name implies they feed on sap and small seeds of the box elder tree. However, they can also feed on soft fruits such as apples or grapes. You will commonly find them in Autumn congregated on the sunny side of a structure during warmer days. As the temperature continues to drop they will find their way in through cracks and crevices. Residual sprays will help in their control but the key is sealing their entry points.
Commonly in the winter, pest control operators, receive calls for multiple flies congregated around windows and doors during sunny days. These are almost always cluster flies. Cluster flies are very interesting as they are parasites of earthworms. They lay eggs in the earth near earthworms entry holes. The larvae emerges to feed on the insides of the earthworms before pupating in the earth. It is important to remember that they do not reproduce indoors and are only present to overwinter.
Many species of wasp also overwinter. It is important to remember during their “sluggish” time they will typically walk instead of flying and it is common for individuals to be stung as the wasps overwinter or emerge in the spring.
The most common overwintering pest in Evansville, Owensboro and Paducah are rodents. Mice are prolific breeders and continue to reproduce in the winter inside of homes and commercial businesses. Mice and Rats can be very destructive as well as a contaminating presence as they commonly chew to build their harborage or get to food sources. Once they establish a feeding site frequent urination can contaminate food stores and create a significant odor. While Rats typically need a larger entry point mice can penetrate a home with an opening only the size of a dime making exclusion the most important tool in their control.
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