Tiny mice create big problems when winter weather drives them indoors

2009-11-29T02:29:46Z

They may be smaller and, some say, cuter, but in terms of pest control, mice are a more prevalent, more damaging and tougher problem than their two rodent cousins, rattus rattus (roof rats) and Rattus norvegicus (Norway rats). And as our Northern California winter grows colder and wetter, mice are more likely to set up housekeeping in our cozy homes and businesses.

The mice we see most often in our Sacramento pest control business are the house mouse (Mus musculus). Two other types of mouse, the deer mouse and the white-footed mouse, also may invade human dwellings but are most often found in cabins and homes in remote or rural areas.

The house mouse can be easily distinguished from deer and white-footed mice by its uniform gray or light brown coloration and a nearly hairless tail. In comparison, the other two species are darker on top with light-colored bellies and tails that likewise are covered with dark fur on top, lighter fur on bottom. House mice weigh about half an ounce and are 5 to 7 inches in length, including their 3- to 4-inch tails.

One reason mice present such a tough pest control problem is their small size. They need only a quarter-inch gap to gain entry into a building and require only minute amounts of food and water to survive. As a result mouse infestations are much more common and difficult to control than rat infestations—and every bit as hazardous to health and property.
Mice eat and contaminate human and pet foods, preferring grains but apparently willing to nibble on almost anything. One of our Sacramento pest control customers discovered a nest of mice in a trunk where she stored historic family documents, vintage clothing and other mementoes. Not only did she find the remains of precious keepsakes shredded in a pile, she found dry dog food nuggets the mice apparently had confiscated from her pet’s dish and tucked away for safe-keeping.

Mice transmit diseases such as salmonellosis (food poisoning) and can cause significant property damage, chewing through electrical wires, shredding insulation and gnawing woodwork.

Often people discover a mouse problem when they find tiny black droppings or notice the corner of a cracker box or bag of chips has been gnawed away. Mice also have a distinctive musky smell that may be noticeable. They are most active at night, can run straight up vertical walls and jump a foot off the ground. They reproduce rapidly, bearing as many as 10 litters of 5 or 6 pups per year; their life span is approximately one year.

The most effective ways to prevent mice are to keep all foodstuffs tightly sealed in glass or metal containers, to avoid leaving pet food out, keep all trash containers tightly sealed and to seal all gaps and crevices where mice can come in from outside, such as along pipes and wiring conduit. Self-installed metal barriers, such as tin can lids and steel wool, are effective barriers to gnawing but usually don’t provide long-term protection.

Apartment buildings are especially notorious for mouse infestations, in part because mice are able to move easily from apartment to apartment along pipes and conduits and because it is difficult to ensure adherence to pest control measures by all tenants.

Once there is an established infestation in a home or business, it is almost always necessary to use mouse traps or poison bait to eliminate the mice. Baits are dangerous and must be kept inaccessible to children and pets. Electronic devices that emit a high-frequency sound, though widely advertised, are generally ineffective in preventing mice. A good feline or canine “mouser” may help control the mouse population or discourage mice from moving in, but will generally not be able to completely eliminate mice once a site is infested.

To read more about house mice and other rodents and household pests, visit http://www.earthguardpest.com/blog.

How to Identify and Prevent Dangerous Spiders in Your Home

2009-09-15T18:15:10Z

Our pest control technicians have been getting lots of complaints about spiders lately. A couple of customers have even stopped by our office, bringing dead spiders in Ziploc bags so we could identify the intruders. In both these cases, the culprits were identified as sac spiders by staff of our Sacramento pest control company.

Although the bite of the agrarian sac or yellow sac spider commonly found in our homes is not fatal to humans, this type of spider is believed to be responsible for more bites than any other spider, usually when trapped in ones clothes or bedding. The bite stings and causes a red welt and irritation similar to a mosquito bite. (If any insect bite causes a severe or unusual reaction, contact a physician immediately.)

The sac spider typically builds its sac-like web in corners, behind shelves and framed pictures and can sometimes be spotted running across walls or ceilings. It is light yellow with a darker stripe down the center of its upper abdomen and, like most spiders, has eight eyes arranged in two rows at the top of its head, difficult to see with the naked eye.

Most spiders are not dangerous and can usually be eliminated by removing their webs and/or eggs. Spiders seen out in the open during the day are unlikely to bite people.

Although we often hear reports of the brown recluse spider in our North-Central California region, in fact the brown recluse doesn’t live in California. The only recluse spider native to California lives in the Southern California desert and is less toxic to humans than its close relative, the non-native Chilean recluse spider, which has become established in Los Angeles County. Recluse spiders have a violin-shaped mark on their heads, which may or may not be easily distinguished, and have only six eyes. They are active at night and tend to stay hidden in dark, undisturbed places like storage boxes or old clothes or shoes.

The only California spider known to inflict serious injury to humans is the black widow, which usually is found outdoors in hidden locations such as in wood piles or underneath porches or sheds. Take care when you’re outside gardening, especially at this time of year, when the weather is still warm and sunny. The black widow’s web may not be visible in the sunlight, and you can easily stick your fingers into the wrong place.

The adult female black widow has a shiny black body, slender black legs, and a red or orange hourglass-shaped mark on the underside of a large, round abdomen. The body, excluding legs, is 5/16 to 5/8 inch long.

The best way to prevent spiders in your home is to vacuum up webs and avoid clutter build-up that can provide hiding places. To prevent spiders from entering your home or commercial building, seal foundation cracks and other access holes, keep window and door screens in good repair, and keep areas around the building foundation free of clutter.

For more information about identifying and controlling spiders and other household pests, visit our company's Website at http://www.earthguardpestcontrol.com. Additional information is available from the UC Statewide Integrated Pest Management Program.

Dave Picton is owner of Sacramento pest control company, Earth Guard Pest Management Services.

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Tiny mice create big problems when winter weather drives them indoors

How to Identify and Prevent Dangerous Spiders in Your Home