Accession Number : ADA114890

Title :   Hormonal Interference with Pheromone Systems in Parasitic Acarines, Especially Ixodid Ticks.

Descriptive Note : Annual technical rept. no. 2. 1 May 81-30 Apr 82,


Personal Author(s) : Sonenshine,Daniel E ; Homsher,Paul J ; Oliver,James H , Jr

PDF Url : ADA114890

Report Date : May 1982

Pagination or Media Count : 111

Abstract : Evidence of the existence of (an) ecdysteroid(s) in the ticks Dermacentor variabilis (Sav) and Hyalomma dromedarii Koch is presented. Radioimmunoassay demonstrated ecdysteroids in unfed adults and different physiological states of the immatures. X-ray microanalysis demonstrated a 3.6 fold greater amount of chlorine in the pheromone glands of ecdysone treated than untreated H. dromedarii females. Gas chromatographic studies demonstrated a 3.8 fold greater accumulation of 2,6-dichlorophenol in ecdysone treated than untreated feeding H. dromedarii females. In contrast, no difference in 2,6-dichlorophenol content was observed between ecdysone treated and untreated feeding D. variabilis females. Studies to determine whether sex pheromone activity in D. variabilis can be affected by administration of ecdysteroids are being continued, but with lower doses. Study of the ultrastructure of the pheromone glands of developing, mature, feeding and replete female H. dromedarii were completed. Comparisons were also made with males. Studies on the chemical and biological regulation of mating in the genera Hyalomma and Dermacentor were also completed. Studies to assess the effects of Precocene-2 on D. variabilis were also completed, and Studies to determine the presence and probable physiological role of gonadotrophic hormone in ticks were done.

Descriptors :   *Pheromones, *Ticks, *Hormones, *Steroids, Interference, Radioimmunoassay, Gas chromatography

Subject Categories : Biochemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE