Mosquito and arbovirus ecology in southeastern California, 1986-1990.

W. K. Reisen, J. L. Hardy, S. B. Presser, M. M. Milby, R. P. Meyer, S. L. Durso, M. J. Wargo, E. Gordon

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Mosquito abundance and western equine encephalomyelitis (WEE) and St. Louis encephalitis (SLE) virus activity were monitored in five valleys in southeastern California from June 1986 through April 1990 to study virus overwintering and possible dissemination from south to north along geographically defined corridors. Culex tarsalis Coquillett predominated in CO2 trap collections and was the only species repeatedly infected with WEE and SLE viruses. Abundance peaked during April-May and August-October. WEE virus infections in Cx. tarsalis generally were detected after the spring peak and were followed approximately 1 mo later by seroconversions in sentinel chickens. SLE virus infections occurred later in the summer but before the fall peak in Cx. tarsalis abundance. Peak Cx. tarsalis abundance occurred when monthly temperatures averaged 25 degrees C, whereas virus infections generally were detected most frequently when temperatures exceeded 29 degrees C. Although the spring increase in Cx. tarsalis abundance occurred earlier in southern valleys, the onset of virus activity was variable among valleys and did not follow a south to north progression.

Original languageEnglish (US)
Pages (from-to)512-524
Number of pages13
JournalJournal of Medical Entomology
Issue number3
StatePublished - Jan 1 1992

ASJC Scopus subject areas

  • Parasitology
  • veterinary(all)
  • Insect Science
  • Infectious Diseases


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