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South San Jose: Mosquito fogger coming after West Nile found in bird, mosquitoes - San Jose Mercury News
SAN JOSE -- The mosquito fogger is coming Thursday night, spraying insecticide in a mile radius around the spot in a South San Jose neighborhood where a West Nile virus-carrying crow was recently found dead.
It wasn't just the bird that triggered the response from the Santa Clara County Vector Control District -- follow up tests on July 5 found about 1 percent of mosquitoes trapped in the 3.75-square mile area surrounding Miner Park also were infected.
"They are essentially little hypodermic needles carrying the virus," said the district's acting manager Russ Parman. "That's our protocol, when they are found it represents a direct risk of human infection."
Between 2003 and 2012, there have been 3,625
statewide cases of West Nile virus in humans, with 130 resulting deaths. There were 479 cases and 20 fatalities in 2012 and so far this year only a single case in Sacramento, where a man died after contracting the virus. But because of other underlying health conditions it is not known if his death was due to West Nile.
According to the state Department of Public Health, three dead birds with the virus have been found in Santa Clara County this year. Parman said 2012 had the third-most incidents of the virus in tested bugs and birds since the virus arrived in California a decade before, but this year has had a slow start.
He said it's not necessarily because of the weather.
"It's counterintuitive," he said. "In a drought
there may be less water, but birds and mosquitoes are going to be more likely to encounter each other at those limited water sources."
The misting pickup truck will begin its duties around 11 p.m. and continue for several hours. The chemical used is a combination of pyrethrin -- derived from chrysanthemum flowers -- and a "synergist" agent that prevents insects from quickly metabolizing the pyrethrin.
That means it can be used in very small concentrations -- one ounce per acre, Parman said.
"The reason it works is we're putting it out in a mist, millions of these little micro droplets," he said. "There's not enough material to harm anything much bigger than a mosquito."
However, not everyone agrees with that statement. Saratoga resident Cheriel Jensen, who filed a legal motion to stop the fogging last year, said it does more harm than good.
"The material safety data sheet shows that it kills fish, bees and predators of mosquitoes," she said. "And it doesn't kill the larva so they bloom right back up. Meanwhile, the predators have been killed."
The county is in the process of coming up with a full environmental impact report on the mosquito operations, but Parman said that they are not legally required to do so.
"We are in compliance with the (California Environmental Quality Act) law, and are exempt from the requirement to do a full EIR," he said. "But we are doing that to help the public understand our programs."
He said that Jensen's concerns are "a common notion, but there's nothing in literature to support that."
He said it's not a residual chemical, and the goal is to mist it over the mosquitoes themselves. Any remaining pyrethrin will be evaporated within hours of sunrise.
He said it's not an attempt at eradication, but to "break the amplification cycle" of West Nile carriers.
They usually conduct one to three such fogging operations per year in "hot spots" that can pop up pretty much anywhere in the county.
"I think it has to do with how the birds amplify the virus," he said. "One bird can have so much that just about every mosquito that bites it will pick it up."
Information packets were distributed to residents in the fogging area Wednesday. Vector control and health department staff will be available to answer questions and provide information from 7:30 a.m. to 7 p.m. Thursday at 408-918-4770 or 800-675-1155.
South San Jose: Mosquito fogger coming after West Nile found in bird, mosquitoes - San Jose Mercury News
SAN JOSE -- The mosquito fogger is coming Thursday night, spraying insecticide in a mile radius around the spot in a South San Jose neighborhood where a West Nile virus-carrying crow was recently found dead.
It wasn't just the bird that triggered the response from the Santa Clara County Vector Control District -- follow up tests on July 5 found about 1 percent of mosquitoes trapped in the 3.75-square mile area surrounding Miner Park also were infected.
"They are essentially little hypodermic needles carrying the virus," said the district's acting manager Russ Parman. "That's our protocol, when they are found it represents a direct risk of human infection."
Between 2003 and 2012, there have been 3,625
statewide cases of West Nile virus in humans, with 130 resulting deaths. There were 479 cases and 20 fatalities in 2012 and so far this year only a single case in Sacramento, where a man died after contracting the virus. But because of other underlying health conditions it is not known if his death was due to West Nile.
According to the state Department of Public Health, three dead birds with the virus have been found in Santa Clara County this year. Parman said 2012 had the third-most incidents of the virus in tested bugs and birds since the virus arrived in California a decade before, but this year has had a slow start.
He said it's not necessarily because of the weather.
"It's counterintuitive," he said. "In a drought
there may be less water, but birds and mosquitoes are going to be more likely to encounter each other at those limited water sources."
The misting pickup truck will begin its duties around 11 p.m. and continue for several hours. The chemical used is a combination of pyrethrin -- derived from chrysanthemum flowers -- and a "synergist" agent that prevents insects from quickly metabolizing the pyrethrin.
That means it can be used in very small concentrations -- one ounce per acre, Parman said.
"The reason it works is we're putting it out in a mist, millions of these little micro droplets," he said. "There's not enough material to harm anything much bigger than a mosquito."
However, not everyone agrees with that statement. Saratoga resident Cheriel Jensen, who filed a legal motion to stop the fogging last year, said it does more harm than good.
"The material safety data sheet shows that it kills fish, bees and predators of mosquitoes," she said. "And it doesn't kill the larva so they bloom right back up. Meanwhile, the predators have been killed."
The county is in the process of coming up with a full environmental impact report on the mosquito operations, but Parman said that they are not legally required to do so.
"We are in compliance with the (California Environmental Quality Act) law, and are exempt from the requirement to do a full EIR," he said. "But we are doing that to help the public understand our programs."
He said that Jensen's concerns are "a common notion, but there's nothing in literature to support that."
He said it's not a residual chemical, and the goal is to mist it over the mosquitoes themselves. Any remaining pyrethrin will be evaporated within hours of sunrise.
He said it's not an attempt at eradication, but to "break the amplification cycle" of West Nile carriers.
They usually conduct one to three such fogging operations per year in "hot spots" that can pop up pretty much anywhere in the county.
"I think it has to do with how the birds amplify the virus," he said. "One bird can have so much that just about every mosquito that bites it will pick it up."
Information packets were distributed to residents in the fogging area Wednesday. Vector control and health department staff will be available to answer questions and provide information from 7:30 a.m. to 7 p.m. Thursday at 408-918-4770 or 800-675-1155.
