MOSQUITO CONTROL PROGRAM

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MOSQUITO CONTROL PROGRAM

• Findings from 2006 and 2007 Seasons
• Recommendations for 2008

City of Manassas Park Department of Public Works
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Mosquito Facts

• Life Cycle
• Adult female lays eggs on stagnant water
  (ditches, buckets, old tires, swamps, gutters)
• Within 7-10 days, eggs become swimming larvae,
  then pupae, then emerge as flying adults.
• Adults eat nectar and fruit juice for sustenance.
• Within 24 hours of emerging, female is looking
  for a blood meal for egg production.
• Female lives 3 to 100 days. Male only 10 to 20
  days.

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Mosquito Facts

• Biting Cycle
• Only adult females bite to obtain a blood meal
  to develop eggs.
• Saliva is injected to prevent coagulation.
• Itching is caused by an allergic reaction to the
  saliva.
• Female is drawn to CO2, body warmth, heartbeat.
• More likely to be bitten if you eat bananas.
• Biting activity is greatest at full moon.

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Mosquito Facts

• Sphere of influence
• Mosquitoes of concern in this area do not wander
  far from the hatch site.
• They are not strong flyers.
• Very important to eliminate any standing water in
  your immediate vicinity and neighborhood.
• Better control can be maintained by preventing
  larvae from becoming adults.

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City of Manassas ParkMosquito Control Program
2006 2007

• Three Phase Approach
• Larval Site Monitoring and Treatment
• Catch Basin Treatment
• Adult Control

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Phase I Larval Site Monitoring and Treatment

• 33 Sites throughout the City
• Chosen as having the potential to breed
  mosquitoes
• 5 complete cycles of inspection each year (about
  once a month)
• Treatment with a Larvicide if active larvae found

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Phase I Larval Site Procedure

• Standard larval dipping technique
• If larvae are found, then the area will be
  treated with VectoLex (Bacillus sphaericus)
• If pupae are found, then the area will be treated
  with Mosquito Larvicide GB-1111

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Phase II Catch Basin Control

• Curb Inlets, Yard Inlets
• 3 treatments during the summer
• Treatment with VectoLex WSP, which is a water
  soluble pouch containing Bacillus Sphaericus or a
  30-day sustained slow release insecticide.
• 850 catch basins treated, 3 times each
• Water soluble pouch dissolves within minutes if
  water is present, or dissolves when rainwater
  enters the structure.

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Phase IIIAdult Control

• Barrier Treatments
• 3 treatments during the summer _at_ Signal Hill Park
• Memorial Day
• July 4
• Labor Day
• Treatment with synthetic pyrethroid insecticide
• Knocks down the adult population for approx. 3
  days during heavy use of the park

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Phase III Adult Control

• Spraying
• Ultra Low Volume (ULV) treatments of up to 45
  miles using truck mounted sprayer
• Treatment with Anvil
• Knocks down the adult population for approx. 3
  days

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Summer 2006 Actuals

• Weather Conditions
• Wetter than average summer months
• Late June storm, 12 inches of rain
• Tropical Storm Gaston in Richmond
• Site Inspections
• May, June, July, August, October
• Catch Basin Treatment
• May, July, August
• Barrier Treatment
• May, July, September
• Truck Mounted Spraying
• July 44 miles, September 44 miles

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Summer 2007 Actuals

• Weather Conditions
• Moderate drought
• Approximately ½ the average rainfall
• Long periods of no rain
• Site Inspections
• June, July, Early-August, Late-August, September
• Catch Basin Treatment
• July, August
• Barrier Treatment
• May, July, August
• Truck Mounted Spraying
• July 43 miles, August 45 miles

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Analysis of Results

• 2006
• 27 positives out of 166 site inspections
• 2007
• 35 positives out of 166 site inspections
• Analyzed sites with repeat positives
• Prepared a graphic illustration
• of positives for larvae ranged from 0 to a
  maximum possible of 10

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Conclusions

• There are sites that consistently produce
  mosquito larvae
• Dry stream behind Lambert Dr.
• Dry stream beside City Hall leading to Conner
  Center Pond 1
• Stream in Signal Hill Park
• There are sites that consistently show no larvae
  production

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2008 Recommendations

• Continue the Site Inspection and Treatment
  Approach
• Investigate the sites that show multiple
  positives
• Identify ways to eliminate mosquito habitat
• Identify any other control measures available

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2008 Recommendations

• Continue the Barrier Spray Approach
• Provide a Barrier Spray Treatment at Signal Hill
  Park
• Prior to Memorial Day, Prior to July 4, and Prior
  to Labor Day

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2008 Recommendations

• Continue the Truck Mounted Spraying Approach
• Three treatments of approx. 44 miles each
• Early July, Late July, Late August

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2008 Recommendations

• Continue the Catch Basin Treatment Approach
• Three treatments of approx. 850 basins each
• As part of stormwater inspection, identify catch
  basins that hold water or provide habitat for
  mosquitoes
• In future years, may be able to reduce the catch
  basin treatment to only those basins which hold
  water and repair these basins on a programmatic
  basis

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2008 Recommendations

• Continue Public Education efforts
• Create a Fight the Bite segment on website
• One of the most important control mechanisms is
  vigilance by residents to eliminate standing
  water around the neighborhood.
• Emphasize personal protection by using mosquito
  repellant.

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2008 Proposed Program Costs

• Program Components
• 5 rounds of site inspections and treatment
• 3 rounds of catch basin treatment
• 3 barrier treatments
• 3 rounds of truck mounted spraying
• Proposed Cost 38,111.08
• 2006 Core program costs 24,720 plus additional
• 2007 Core program costs 35,050

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Additional Information

• Department of Public Works
• Kathryn Moore
• Deputy Director
• [phone]
• Prince William County Mosquito Control
  http//www.pwcgov.org/default.aspx?topic010073000
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• Fairfax County Mosquito Control
  http//www.fairfaxcounty.gov/hd/westnile/