Search PubMed⌕ Search

Biomedical subjects

R D Sjogren

Publications and source records attributed to R D Sjogren.

11 recordsLinked to original sources
PubMed1994

Vector control by removal trapping.

The classic approach to vector control where large tracts of land are treated with an insecticide has many shortcomings. These include high cost, chemical resistance of target species to many of the widely used insecticides, a lack of public acceptance, and the detrimental effect of sprays on nontarget species. Removal trapping, the use of visual, auditory, and olfactory attractants to lure target species into small areas where they are killed, has recently received well-deserved attention as a possible alternative to the broadcast application of chemicals for vector control. We briefly review the histories of four successful removal trapping programs; Hippelates eye gnats in the United States, tsetse flies in Africa, Stomoxys calcitrans flies in Australia, and tabanids in the United States. We then review the future prospects of removal trapping and evaluate its potential as a viable method for vector control.

Africa↗
PubMed1994

Efficacy of methoprene pellets against Coquillettidia perturbans larvae.

Of 21 wetlands in the Minneapolis-St. Paul area that supported similar densities of Coquillettidia perturbans larvae, 7 wetlands were treated with Altosid methoprene pellets at 5.6 kg/ha on May 28, 1992, 7 were treated with Altosid XR extended residual methoprene briquets at 1 briquet/9.3 m2 in March 1992, and the final 7 remained untreated. Emergence data collected from May 28 through late August in all sites indicated pellet and briquet treatments achieved greater than 90% control.

Animals↗
PubMed1992

Sublethal effects of larval methoprene exposure on adult mosquito longevity.

Larvae of Aedes aegypti were exposed to sublethal concentrations of the insect growth regulator, methoprene, and the glycogen content of pupae and surviving adults was compared and effects on adult longevity determined. The glycogen reserves in both male and female Ae. aegypti pupae were significantly reduced as a result of methoprene exposure. The longevity of adult females was also significantly reduced, but exposure affected neither the longevity nor the glycogen content of adult males. Adult sugar feeding increased the amount of glycogen in both treated and control females. The reduced longevity of adult females from larval methoprene treatment appeared not to be directly related to reduced glycogen, but rather reflected neuroendocrine abnormalities induced by this juvenile hormone analogue.

Aedes↗
PubMed1991

A vision for the future.

An analogy is made between the Persian Gulf War and its effective, high tech weaponry and future vector control program planning. Ever increasing population pressures and environmental concerns are seen as factors driving ever more selective control strategies. Developing positive public mosquito control perceptions will be a result of greater commitment to public education. Participative management and program ownership by staff in a "bottom up" environment is encouraged. The role of host attractant development is discussed as an example of proactive involvement by members.

Forecasting↗
PubMed1986

Evaluation of methoprene, temephos and Bacillus thuringiensis var. israelensis against Coquillettidia perturbans larvae in Minnesota.

Temephos, Bacillus thuringiensis var. israelensis (B.t.i.) and methoprene were tested for larval control of Coquillettidia perturbans. Neither temephos nor B.t.i. treatments at their maximum recommended dosages consistently reduced larval numbers. Larval emergencies were reduced 99% in test plots treated with experimental, controlled release methoprene briquets (Altosid SR-10). Breeding sites of Cq. perturbans in a 5,000 km2 area were treated using methoprene briquets in the 1984 season. Adult populations in a 7,700 km2 area were 2.5 times higher in untreated areas than treated areas. Methoprene can effectively control larval populations of Cq. perturbans.

Animals↗
PubMed1976

Variations in the susceptiblility of field and laboratory populations of Culex tarsalis to experimental infection with western equine encephalomyelitis virus.

Four field populations and four laboratory colonies of Culex tarsalis from California were evaluated for their susceptibility to infection with western equine encephalomyelitis (WEE) virus by intrathoracic inoculation and by feeding on pledgets soaked with a virus-blood-sucrose mixture. All mosquito strains were uniformly susceptible to infection by intrathoracic inoculation, but 50% infective doses for field and colonized strains varied as much as 1000- to 1500-fold, respectively, by pledget feeding. Moreover, dose-response curves obtained by pledget feeding revealed that some field and laboratory strains of C. tarsalis were quite heterogeneous for susceptibility since some individual females could be infected after ingestion of small concentrations of virus and others could not 0e infected by increasing the concentration of virus by 1000- to 10,000-fold. Variability in viral susceptibility of different mosquito strains could not be correlated with differences in autogeny rates or organophosphorus insecticede resistance.

Animals↗