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Mosquitoes of Georgia

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Mosquitoes of Georgia

  1. 1. Mosquitoes of Georgia Rosmarie Kelly Public Health EntomologistGeorgia Department of Public Health
  2. 2. Life Cycle• Egg• Larva• Pupa• Adult
  3. 3. Eggs• After laying, eggs generally require 2-5 days of incubation before hatching – Eggs laid in permanent water will hatch after incubation – Eggs laid in tree holes, containers, or floodwater areas will hatch when covered with water after a period of incubation• A female will lay between 100-150 eggs• Most eggs are very resistant to environmental conditions• Eggs may stay viable for many years
  4. 4. Eggs• Laid singly – On water • Anopheles • Coquillettidia – On land • Aedes & Ochlerotatus • Psorophora• Egg rafts – Culex spp. – Culiseta spp. 4
  5. 5. More Eggs
  6. 6. Larvae• Four instars• It generally takes 3 to 7 days to complete development depending on food and temperature• Most larvae are filter feeders• Larvae breath air but can absorb oxygen through the body wall
  7. 7. Types of Larvae = “wigglers”• Culicine: All genera other than Anopheles – Culex, Ochlerotatus, Aedes, Psorophora, Culiseta…• Anopheline: All the Anopheles species
  8. 8. Larval Instars
  9. 9. Pupae• Air breathers• Do not feed• Mobile• Generally takes 1-2 days before the adult emerges
  10. 10. Pupae = “tumblers”
  11. 11. 11Emergers
  12. 12. Adults• Mosquitoes mate soon after emerging• Male mosquitoes die soon after mating• A female will lay approximately 100-150 eggs per one oviposition cycle• A female will go through about 10 oviposition cycles• Most female mosquitoes live about 2 weeks and may live 2 months or more
  13. 13. WHAT DO THEY EAT?Plant juices & nectarFemales also need blood from other animals
  14. 14. The Blood Meal
  15. 15. WHY DO FEMALE MOSQUITOES NEED YOUR BLOOD? They use the blood to help develop eggs •Females generally begin blood feeding following mating •Eggs are ready to be laid approximately 3 days following a blood meal And now there will be more mosquitoes!
  16. 16. MOSQUITO LARVAE ARE FOUND EVERYWHERE AROUND THE WORLD, EXCEPT ANTARCTICA.THEY ARE FOUND FROM 3,000 FT BELOW THE SURFACE IN MINESTO 16,000 FT ELEVATION IN THE HIMALAYA MOUNTAINS.
  17. 17.  A BASIC CLASSIFICATION OF LARVAL HABITATS INCLUDES: I. SOIL-BASED WATER COLLECTIONS • PERMANENT • SEMI-PERMANENT • TEMPORARY • FLOOD PLAINS • RAIN POOLS • BRACKISH WATER POOLS • RUNNING WATER COLLECTIONS II. CONTAINER WATER COLLECTIONS • ARTIFICIAL • NATURAL
  18. 18. Habitats• Fresh, Brackish, or Saltwater – Permanent water eggs (e.g. Culex, Anopheles) are laid directly on water - ponds, pools, and streams and hatch after incubation. – Floodwater eggs (e.g. Psorophora, Aedes, Ochlerotatus) are laid on moist soil - ditches, floodplains, depressions and upper marsh and hatch after inundation and incubation. – Eggs laid above water-line: • Natural containers like rock holes, water holding plants, and tree holes. • Artificial containers like buckets, birdbaths, flower pots, rain gutters, tires, cans, and boats.
  19. 19. Permanent-water Mosquito Habitats
  20. 20. Flood-water Mosquito Habitats
  21. 21. Flood-water Mosquito Habitats
  22. 22. Container Habitats
  23. 23. Container Habitats
  24. 24. Tires are love at first sight for species such as Ochlerotatus japonicus, Aedes albopictus and Oc. triseriatus
  25. 25. A Specialized HabitatWyeomyia smithii Every leaf has a water receptacle Parker Whitt, NC PHPM, 2005
  26. 26. Some Common Georgia Species
  27. 27. Aedes albopictus
  28. 28. Aedes aegypti Lyre-shaped markings Pale scales on clypeus
  29. 29. Aedes vexans M. Cutwa-Francis, FMEL M. Cutwa-Francis, FMEL
  30. 30. Anopheles quadrimaculatus
  31. 31. Malaria in the United StatesAnophelesquadrimaculatus ishistorically the mostimportant vector ofmalaria in theeastern UnitedStates.Malaria was aserious plague in theUnited States forcenturies until itsfinal eradication inthe 1950s.
  32. 32. Primary La Crosse VectorOchlerotatus triseriatus, Tree-hole Mosquito
  33. 33. LAC is very under-reportedin Georgia.Ochlerotatus triseriatus isthe primary vector of LAC.
  34. 34. Ochlerotatus fulvus pallens M. Cutwa-Francis, FMEL
  35. 35. Ochlerotatus atlanticus/tormentorOc atlanticus - Oc tormentor -larval ID larval IDSetal tuft on Setal tuft onsiphon(1-S) siphon (1-S)outside of inserted withinpecten pecten
  36. 36. Saltmarsh Species Ochlerotatus Percent of Total Collected sollicitans Ae. albopictus Ae. vexans An. crucians An. quadrimaculatus Cq. perturbans M. Cx. nigripalpus Cutwa-Francis, FMEL Cx. quinquefasciatus Cx. salinarius Oc. atlanticus Oc. japonicus Oc. sollicitans Oc. taeniorhynchus Oc. triseriatus Ochlerotatus Ps. columbiae taeniorhynchus The brood of ‘99
  37. 37. Coquillettidia perturbans Preapical pale band on hindtibia M. Cutwa-Francis, FMEL
  38. 38. Culiseta melanura
  39. 39. EEE is endemic in south Georgia.Culiseta melanura is the enzooticvector.
  40. 40. Culex spp Cx nigripalpus Cx salinarius Cx quinquefasciatusvectors of WNV
  41. 41. The map shows counties reportingWNV+ birds, horses and otherlivestock or companionanimals, mosquitoes, and humans.Counties with no reported positiveshave done little to no surveillance;WNV is considered endemic inGeorgia.Culex quinquefasciatus is the primaryvector of WNV in Georgia.
  42. 42. Psorophora columbiae
  43. 43. Psorophora ferox M. Cutwa-Francis, FMEL
  44. 44. Psorophora ciliata Black erect scales on Hindtibia and hindtarsomere 1 Median longitudinal• Giant mosquito gold line on scutum• Adult females bite humans• Larvae are predaceous on other mosquito larvae
  45. 45. A Beneficial Mosquito
  46. 46. http://www.gamosquito.org/mosquito.htm And Many Many MoreThere are ~60 species of mosquitoes found in Georgia
  47. 47. And then……there are the recent introductions.  Ochlerotatus japonicus • The 1st published record of Oc japonicus japonicus in Georgia (Rabun County) occurred in 2004. • This species was collected earlier (2002) in Fulton County.  Culex coronator • A total of 10 female Cx coronator were collected from 6 different sites during routine mosquito-borne virus surveillance in Dougherty County in 2006.  In 2007, adult Cx coronator were collected in Chatham County, Georgia.
  48. 48. 2009
  49. 49. Any Questions?

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