Operations Statistics

Overview

How to Interpret Operations Statistics

Operations statistics tell us what kind of work our vector control technicians spent their time on in the past month. These numbers are useful for helping us make decisions about how to allocate resources or what programs to focus on.

Tables of acres treated refer to larger sources of standing water where mosquitoes may develop. Numbers of sourced treated include smaller residential sources of standing water, such as swimming pools and backyard containers.

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Service Requests in August 2019

This table contains the number of each type of service request in August 2019 compared to the four-year average in August. Total service requests are higher this August than the four-year average. The higher number is largely because of 608 yellowjacket and wasp service requests, which is a record month for the District. Mosquito service requests are near average, even though trap collections show above average mosquito population abundance this summer. Dead birds are lower than usual this summer, because there has been no West Nile virus activity in the bay area this season.

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Acres treated with larvicide in August 2019

This table shows the number of acres treated with larvicide during 2019. A large number of acres treated in August were marshes and impounds is especially high, mostly by helicopter in tules that are not accessible by foot. Creeks and catch basins were also treated on a regular schedule during August During the summer months, vector control technicians walk through creeks and treat pockets of standing water that can breed mosquitoes.

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Service Requests in July 2019

This table contains the number of each type of service request in July 2019 compared to the four-year average in July. Total service requests are higher this July than the four-year average. The increase is because of a spike in yellowjacket and wasp service requests, which are a seasonal problem. Dead birds are lower than usual this summer, because there is no West Nile virus activity in the bay area yet this summer.

July Service Requests

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Acres treated with larvicide in July 2019

This table shows the number of acres treated with larvicide during 2019. The number of acres treated in marshes and impounds is especially high, mostly because of helicopter treatments of three sites with tules. Creeks and catch basins were also treated consistently in July, although these make up substantially less acreage. During the summer months, vector control technicians walk through creeks and treat pockets of standing water that can breed mosquitoes.

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Acres treated with larvicide in June 2019

This table shows the number of acres treated with larvicide during 2019. The highest proportion of acres treated remains marshes and impounds, in addition to nearly as much acreage treated in creeks. During the summer months, vector control technicians walk through creeks and treat pockets of standing water that can breed mosquitoes. The seasonal catch basin treatment program, which began in May and continues until heavy fall rains is also a significant part of the summer mosquito control program. 

 

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Acres treated with larvicide in May 2019

This table shows the number of acres treated with larvicide during 2019. The highest proportion of acres treated remains marshes and impounds, although the acreage continues to decrease as some of these sources evaporate. Sewage treatment plants needed a higher amount of larvicide treatment during May than previous months. Treatment plants can produce considerable numbers of mosquitoes during summer months, as they hold a number of standing water sources. The seasonal catch basin treatment program started in May, and will be a significant part of summer mosquito control operations.

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Acres treated with larvicide in April 2019

This table shows the number of acres treated with larvicide during 2019. The highest proportion of acres treated remains marshes and impounds, although the amount is considerably less in April than March.  This number will continue to decline as the weather continues to warm and remain dry. The acreage of catch basins is higher an April than March because some of these sources are beginning to breed. The seasonal catch basin treatment program starts in May, and these sources will be a significant part of summer mosquito control operations.

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Acres treated with larvicide in March 2019

This table shows the number of acres treated with larvicide during 2019. Seasonal marshes and impounds remain full of water and are breeding mosquitoes.  The mosquito larvae are treated with larvicide as they reach the optimal growth stage to prevent emergence of adult mosquitoes. These sources will continue to need treatment until they evaporate during the dry season.

Source Type

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Acres Treated with Larvicide in January and February 2019

This table shows the number of acres treated with larvicide during January and February. Seasonal marshes and impounds remain full of water and are breeding mosquitoes.  The mosquito larvae are treated with larvicide as they reach the optimal growth stage to prevent emergence of adult mosquitoes. These sources will continue to need treatment until they evaporate during the dry season.

Source Type

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Acres Treated with Larvicide in January 2019

This table below shows the number of acres treated with larvicide during January. The number of acres treated this month is considerably higher than in December (2.04 acres). Seasonal marshes and impounds are now full of standing water and breeding mosquito larvae. The mosquito larvae are treated with larvicide as they reach the optimal growth stage. The number of acres treated will continue to remain high at marshes and impounds as long as rainy weather continues.

 

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Acres Treated with Mosquito Larvicide in November and December 2018

This table shows the number of acres treated with larvicide during November and December. The number of acres treated during these months is low. Technicians are currently monitoring sources for mosquito larvae as they fill with water. The mosquito larvae are treated with larvicide when they reach the optimal growth stage. The number of acres treated will likely increase substantially in January, especially in marshes and impounds, depending on rainfall. 

 

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Service Requests in November 2018

This table contains the number of each type of service request in November 2018 compared to the three-year average in November.  The total number of service requests is somewhat below average, mainly because we have had fewer than typical mosquito-related requests. The number of yellowjacket and wasp service requests continued in a steep decline, shown in the graph, and will likely remain low until spring.

 

Type of Service Request

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Acres Treated with Mosquito Larvicide in October 2018

This table shows the number of acres treated with larvicide during September and October. The number of acres treated is drastically lower in October compared to September, largely from the marshes and impounds category. Helicopter treatments were not conducted during the month of October, which is a large part of summer acreage treated. Also, after a dry summer and mostly dry autumn thus far, there is less standing water throughout the county. Creeks and catch basins are continuously treated in summer.

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Service Requests in October 2018

This table contains the number of each type of service request in October 2018 compared to the three-year average in October.  Total number of service requests are above average, mainly because of yellow jacket and wasp requests. Dead birds were also somewhat higher than average this October.

Type of Request

October 2018

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Acres Treated in September 2018

This table shows the number of acres treated with larvicide during August and September. The largest proportion of acres treated are in marshes and impounds, mainly from helicopter treatments. Creeks and catch basins are also continuously treated in summer. Although the acreage from creeks and catch basins is relatively small, they are numerous and can produce abundant adult mosquitoes without proactive inspections and larvicide treatments. Catch basin treatments will continue until heavy fall rains begin.

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Service Requests for September 2018

This table contains the number of each type of service request in September 2018 compared to the three-year average in September. Mosquito service requests continue to be well below average this year. This low number of mosquito requests reflects an effective catch basin treatment program and few media reports on mosquito-borne diseases this summer. Yellow jacket and wasp requests are the most abundant type of request in the summer and have been especially numerous this year, although the numbers are dropping from a peak in August.

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August 2018 Service Requests

This table contains the number of each type of service request in July and August 2018 compared to the three-year averages in July and August. Service requests are higher than average in most categories, with the notable exception of mosquito service requests in August 2018, which is well below average. This low number of mosquito requests is probably because of a cooler than typical August and an increasingly effective catch basin treatment program. Yellow jacket and wasp requests are the most abundant type of request in the summer and have been especially numerous this year.

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Acres Treated in June 2018

This table shows the number of acres treated with larvicide during May and June. The largest proportion of acres treated are from creeks, which often have pockets of still water during the summer because of reduced water flow. The total number of acres treated in June is lower than May, mainly because of the reduction in acres of marshes and impounds. These wetland areas are mostly seasonal and have largely evaporated by June.

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Service Requests for June 2018

This table contains the number of each type of service request in June 2018 compared to the three-year average in June. Total service requests are higher this June than the three-year average, although the number of mosquito service requests is somewhat lower than average. Most of the increase is due to the spike in yellowjacket and wasp service requests, which are a seasonal problem.

Type of Request

Commands