Ecdysteroid titer and oocyte growth in the northern house mosquito, Culex pipiens L.

G. D. Baldridge, R. Feyereisen

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


1. 1. In an anautogenous strain of the northern house mosquito, Culex pipiens, the ovaries reached the resting stage (follicle length = 90 μm) three days after adult emergence. 2. 2. Follicle length increased from 90 to 550 μm between 0 and 60 hr after a blood meal. 3. 3. Total ecdysteroids reached a peak at 400 fmol/insect at 36 hr after a blood meal then declined rapidly. 4. 4. The ratio of 20-hydroxyecdysone to ecdysone increased in conjunction with the total cedysteroid level. 5. 5. Oocyte growth beyond the resting stage and initiation of vitellogenesis was dependent on a head factor which was released within 4-8 min of the start of the blood meal.

Original languageEnglish (US)
Pages (from-to)325-329
Number of pages5
JournalComparative Biochemistry and Physiology -- Part A: Physiology
Issue number2
StatePublished - 1986
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgements-We thankA . Boernera nd S. Harwood for theirt echnicaal ssistanceD, r D. W. Beanf or readingt he manuscripta, nd Dr J. D. O’Connor (UCLA) for a gift of antiserum.T his work was supportedb y NIH grant AI 19192t o R. F. Oregon Agricultural ExperimentS tation Technicalp aper No. 7551.


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