HomeMy WebLinkAboutPresentation - #06Mosquitoes in Orange CountyCity of Santa AnaLora YoungDirector of CommunicationsOrange County Mosquito and Vector Control District
Scope and Governance•Established in 1947 as the Orange County Mosquito Abatement DistrictIndependent Special District governed by the California H&S Code•Serves all of Orange County’s 34 cities and unincorporated areas3.2 million residents•Governed by a 35 member Board of TrusteesOne City appointed representative from each city One appointee from CountyBudget 15.5 Million FY 20/21
MosquitoesYellow Fever MosquitoAedes aegypti•Zika•Dengue viruses•Yellow fever•Chikungunya•West Nile virus•Dog heartwormAsian Tiger MosquitoAedes albopictus•Dengue viruses•Zika•Chikungunya•West Nile virus•Dog heartworm•West Nile virus•St. Louis encephalitis•Western equine encephalitisSouthern House MosquitoCulex quinquefasciatus
•284 WNV Positive Mosquito Samples •9 WNV Human Cases•38 Birds Tested Positive for WNVIn Santa Ana•12 WNV Positive Mosquito Samples•No WNV Human Cases•2 Bird Tested Positive for WNVWest Nile Virus in OC in 2020
050100150200250300744 WNV Infections (33 deaths)After 2014‐15, focus was toprevent a repeatWest Nile Virus in Orange County, 2004 - 2020
•Santa Ana •Anaheim•Fullerton•Orange•Garden Grove•Huntington Beach•Tustin •La Habra•Buena ParkWNV Nile Virus High Risk Areas2004‐2016Hotspot AnalysisHigh Risk 9 Cities
Cell = 0.5 mi25BLK = 4.5 mi2Extra traps SET in Block:•If more than one trap/block is set, the risk (Vector Index) can be compared among blocks•Trigger per Block VI > 80012346789
•District sets over 100 traps per week•Extended trapping is initiated with a positive sample•Control methods are determined based on surveillance data and increased risk for mosquito‐borne diseasesDetermining High Risk Areas
Integrated Vector ManagementEarly Intervention •Advisory Notices•Treatment of mosquito breeding sources•Source Reductions•Surveillance •Emergency Response
Invasive Aedes in Orange County
2015Aedes Infestation2016 = 3,500 acres or 5.0 sq.mi2017 = 17,000 acres or 26 sq.mi2018 = 45,600 acres or 71 sq.mi2019 = 63,813 acres or 99.7 sq.mi2020 = 65,229 acres or 102 sq.mi20162017201820192020
Backyard Breeding
Invasive Aedes Life Cycle
Egg Size
What Is the difference?Culex AedesBreeding habitsLarger Sources Backyard SourcesBiting habitsBite at dusk and dawn, prefer birdsBite during day, prefer mammalsEggsEggs laid in rafts Individual eggsBreeding timeOne week Eggs viable for years in dry conditionsWhere do they liveOutdoors Indoors and Outdoors
2020 Service Request in Santa AnaSanta Ana CountyMosquitoes568 7230Rats13 374Red Imported Fire Ants18 659Other (includes mosquitofish requests)25 193Total624 8456
Mosquito Activity in Santa AnaHigh Service Request Areas•E. 17th St & Wright•W. Edinger & S. Flower area•Civic Center (W Santa Ana Blvd. between N Ross St & N Broadway) High Mosquito Trap Counts•21stand Alana•Birch Park•Fairhaven/Santa Ana Cemetery
•The District modified its rat control program due to:Growing concerns and evidence showing secondary poisoning of wildlifeIncreasing regulatory restrictionsThe District's commitment to integrated vector management practices (IVM)Controlling for Rats
•Rats are attracted to an area due to:•Availability of food•Pet food•Improper composting•Vegetable gardens, fruit trees•Snails•Availability of habitat•Over‐grown trees, shrubs, and plants•Access into homes and other structures•WaterControlling for Rats
Future ImpactsWorking Together• Include the District messages in emails and newsletters to residents• Partner on shared social media messaging• Reshare alerts and notifications for your district• Invite the District to community outreach events and presentations• Help increase awareness on the shared responsibility of mosquito control:• Residents should check and eliminate for standing water weekly•Remove saucers from under potted plants.•Scrub outdoor containers that have held water with hot, soapy water to kill mosquito eggs. Store in a dry place•Wear EPA‐registered repellent when outdoors•Talk to neighbors about their mosquito control
Questionswww.ocvector.org