Category Archives: Vector Control

All Mosquitoes Are Not The Same – How Newly Discovered Invasive Aedes aegypti Mosquitoes Differ from the West Nile virus Mosquitoes Already in Contra Costa County

West Nile virus (WNV) first appeared in Contra Costa County in 2004. During the 18 years since then, County residents have become used to the Contra Costa Mosquito & Vector Control District’s (District) message that it’s important to dump out … Continue reading

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Adult Mosquito Control Notification for Martinez Waterfront – Wednesday, September 28

Notification of Action Due to the high number of mosquitoes in the area, the Contra Costa Mosquito & Vector Control District will be using truck-mounted, ultra-low volume sprayers to control adult mosquitoes along the Martinez Waterfront: DATE: Wednesday, September 28, … Continue reading

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Invasive Species of Mosquitoes in Contra Costa County

Contra Costa County is home to 23 native species of mosquitoes. Earlier this month the Contra Costa Mosquito & Vector Control District (District) found a non-native species of mosquito, Aedes aegypti, in a residential area of Martinez, south of Highway 4. … Continue reading

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More Mosquitoes Test Positive for West Nile Virus in Contra Costa County

The Contra Costa Mosquito & Vector Control District (District) reports more mosquitoes have tested positive for West Nile virus (WNV) in Contra Costa County. The mosquitoes were collected from a trap in an agricultural area east of Brentwood. This is … Continue reading

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First Invasive Aedes Mosquitoes Found in Contra Costa County

The Contra Costa Mosquito & Vector Control District (District) has identified the invasive mosquito species Aedes aegypti in Contra Costa County. The mosquitoes were found in Martinez. This is the first group of invasive mosquitoes reported in Contra Costa County. The District … Continue reading

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First Mosquitoes of 2022 Test Positive for West Nile Virus in Contra Costa County

The Contra Costa Mosquito & Vector Control District (District) reports a group of mosquitoes has tested positive for West Nile virus (WNV) in Contra Costa County. The mosquitoes were collected from a trap in the city of Oakley. This is … Continue reading

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Why the Risk of West Nile Virus Increases During a Drought

All 58 California counties, including Contra Costa County, are under a drought emergency and summer has barely begun, with its dry, hot weather. Understandably, the idea of below-average rain gauges and reservoirs may sound like fewer water sources to produce … Continue reading

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What to Do About Underground Yellowjackets, Now

Yellowjackets are beneficial insects that eat garden pests and pollinate certain plants through daily foraging. If left undisturbed, yellowjackets are typically not a problem; however, these wasps will defend their nest if they sense a threat to the colony. Yellowjackets can … Continue reading

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The Contra Costa Mosquito & Vector Control District’s 95th Anniversary

This year, the Contra Costa Mosquito & Vector Control District (District) is celebrating 95 years of protecting public health. Wow! 95 years is certainly an impressive accomplishment, but how did the District get here? Let’s take a look at the District’s history. In … Continue reading

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First Dead Bird of 2022 Tests Positive for West Nile Virus in Contra Costa Co.

The Contra Costa Mosquito & Vector Control District (District) reports the first dead bird of the year has tested positive for West Nile virus (WNV) in Contra Costa County. The dead bird, an American crow, was picked up in an … Continue reading

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CALIFORNIA MOSQUITO AWARENESS WEEK

As we all try to navigate what the new normal will be like now that the COVID-19 pandemic is entering the endemic phase, it turns out, we don’t have to look any further than another endemic virus that we’ve been … Continue reading

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Mosquitofish Service Changes

Read This First, BEFORE Trying to Pick Up Fish at the District With spring right around the corner, the time is now to take steps to prevent mosquitoes. Dump out any standing water and if you’re a Contra Costa County … Continue reading

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Winter is Here and So Are the Skunks

Seeing (or more likely, smelling) skunks lately? As winter continues, so does the appearance and aroma of these animals, as skunks are seeking a mate and a place to provide shelter to their young. Skunks do not jump or climb, … Continue reading

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5 Steps to Take Now to Prevent Mice at Your Holiday Celebration

Mice can spread bacteria and viruses in their droppings and nesting material. They’ve also been associated with asthma. Mice have difficulty maintaining body warmth, so they are attracted to the warmth, food and shelter that can be found in your … Continue reading

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Why the Change in Seasons Can Increase the Risk of Rats and Mice

9 Tips on What to do Now to Reduce the Risk of Rats and Mice in Fall and Winter Well, that was quick. One week it’s sunny and warm and now it’s cool and rainy. The change in seasons from … Continue reading

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Why are Yellowjackets More Active Right Now?

10 Tips on How to Respond to Today’s Yellowjackets and Prevent Tomorrow’s It’s a sunny late September afternoon and you head out to the patio to enjoy your lunch.But, no sooner have you taken your first bite, when a yellowjacket … Continue reading

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First Dead Bird of 2021 Tests Positive for West Nile Virus in Contra Costa Co.

The Contra Costa Mosquito & Vector Control District (District) reports the first dead bird of the year, and more mosquitoes have tested positive for West Nile virus (WNV) in Contra Costa County.The dead bird, a California scrub-jay, was picked up … Continue reading

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What’s the most effective Mosquito Repellent?

Make Sure the Repellent is EPA Registered According to the Centers for Disease and Prevention (CDC), repellents that are registered by the US Environmental Protection Agency (EPA) and contain one of the following active ingredients are safe and effective when … Continue reading

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PREVENTING MOSQUITOES AT HOME

It’s As Simple as Dumping out Water, If You Know Where to Look Mosquitoes need water to develop from egg to biting adult. To reduce the risk of mosquitoes at home, dump out any standing water on your property. While … Continue reading

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Report Dead Birds to Reduce Risk of West Nile Virus

August marks the dog days of summer with its long sunny days and warm nights. It’s the perfect time of year for an evening walk. As you walk around your neighborhood, the Contra Costa Mosquito & Vector Control District (District) … Continue reading

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