Old tires, sagging tarps, and empty planters all collect water and are ground zero for mosquito breeding, DNREC says.

The state Division of Fish and Wildlife Mosquito Control Section urges Delaware residents to “Fight the Bite.”

Reduce mosquito production on properties through good water sanitation.

This involves regularly draining or changing unneeded sources of standing water.

If stagnant for four or more consecutive days, mosquitoes will breed.

Prevent water accumulation in the first place by upending, removing or storing indoors any outdoor containers that can hold water.

Watch “Mosquito Control & Your Backyard,” a new video on DNREC’s YouTube channel, with more information on these good water sanitation practices.

To report intolerable numbers of biting mosquitoes and request local relief, call Mosquito Control’s field offices:

Glasgow, 302-836-2555, serving New Castle County and the northern half of Kent, including Dover.

Milford, 302-422-1512, serving Kent County south of Dover and all of Sussex.

Disease Carriers

Of the 57 mosquito species known to live in Delaware, 19 are problematic for people, either by biting or potentially transmitting mosquito-borne illnesses, or both.

From early May through the first hard freeze in the fall, two species – the common house mosquito (Culex pipiens), a native species, and the Asian tiger mosquito (Aedes albopictus), an invasive species first found here in 1987 – are common where people live, work or recreate in urban and suburban settings.

In addition to their annoying bites, these mosquitoes have the potential to carry and transmit illnesses, with the house mosquito a known carrier of West Nile virus, and the Asian tiger mosquito a possible carrier for West Nile, chikungunya and Zika viruses.

Delaware Mosquito Control Administrator William Meredith said at this time, there is no evidence in Delaware that local tiger mosquitoes have served as vectors to transmit Zika or chikungunya to people.

“However, science suggests that if local Asian tiger mosquitoes bite a returning traveler who has an active case of either of these viruses, those mosquitoes could become carriers and transmit Zika or chikungunya to those they bite next, with the potential to spread the viruses among humans and local mosquitoes,” he said. "The larvae of both the house mosquito and the Asian tiger mosquito can grow in a variety of containers holding water in our backyards, so the best way to control both of these species is by eliminating such standing water.”

Meredith said that due to the hard-to-reach and often hidden aquatic habitats where mosquitoes deposit eggs that hatch into larvae, as well as the behaviors of adult mosquitoes, Asian tiger mosquitoes pose a particular challenge to control through our chemical insecticides or biological measures alone.

During mosquito season, property owners are urged to do their part by cleaning debris from clogged rain gutters and emptying water from corrugated downspout extenders; frequently changing water in birdbaths; draining unused swimming pools and kiddie wading pools; and by preventing or draining standing water from outdoor containers such as discarded tires, cans, buckets, flower pot liners, children’s toys, unprotected water cisterns, upright wheelbarrows, uncovered trash cans, upturned trash can lids, open or lidless dumpsters, plugged or undrained boats, sags in tarps covering boats or ATVs, or other water-holding containers.

In comparison to many other mosquito species, common house mosquitoes and Asian tiger mosquitoes have short flight ranges of only a few hundred yards from where they hatch, but even this short distance can be enough to infest a neighborhood. Common house mosquitoes are most active at dusk and dawn, but will also feed throughout the night. Asian tiger mosquitoes are aggressive daytime biters, but also feed at dusk and dawn.

“By practicing good water sanitation on their properties, residents will be helping themselves and their neighbors too – and the best results come from community-wide participation,” Meredith said, noting that means involving county or local municipal governments, homeowner or civic associations, property management groups or maintenance corporations as well as individual property owners in this common cause. “In the fight against house mosquitoes and Asian tiger mosquitoes, we’re all in this together – and every little bit helps.”

Division of Public Health Medical Director Dr. Awele Maduka-Ezeh said that zika transmission continues to spread to new countries, and the best way for people to protect themselves from Zika or any mosquito-borne illness is to prevent mosquito bites during travel abroad and during Delaware's mosquito season.

"It is possible that local transmission could occur either from mosquito bites once the season starts, from sexual transmission or from mother to baby during pregnancy,” Maduka-Ezeh said “Taking precautions to stop mosquitoes from breeding around your home and preventing bites is the best protection."

For more information about Delaware’s Mosquito Control program, including more information about how to prevent or get rid of standing water that produces mosquitoes, call the field offices or the main Dover office at 302-739-9917, or visit http://de.gov/mosquito.

For more information about Zika and other mosquito-borne illnesses in humans, please contact the Delaware Division of Public Health at 302-744-1033 or 888-295-5156. Facts and information on Zika and mosquito control also are available at the following links:

English: http://www.dhss.delaware.gov/dhss/dph/files/zikafaq.pdf

Spanish: http://dhss.delaware.gov/dhss/dph/files/zikafaqsp.pdf

Haitian Creole: http://dhss.delaware.gov/dhss/dph/files/zikafaqhc.pdf