| comparison of mitochondrial dna sequences of seven morphospecies of black flies (diptera: simuliidae). | universal primers constructed from the 16s ribosomal rna gene in the drosophila yakuba mitochondrial genome were successfully used to amplify, via the polymerase chain reaction, the homologous region of mitochondrial dna from seven black fly morphospecies. amplification was achieved from single larval salivary glands and from single adults preserved in carnoy's fixative (ethanol - acetic acid, 3:1), allowing dna sequences and polytene chromosome banding pattern data to be gathered from the same ... | 1991 | 2055453 |
| laboratory study of the influence of water temperature and ph on bacillus thuringiensis var. israelensis efficacy against black fly larvae (diptera: simuliidae). | an experimental formulation of bacillus thuringiensis var. israelensis was used in the laboratory to assess the influence of water temperature and ph on the relationship between concentration, duration of exposure, and mortality of the northern black fly species simulium decorum and prosimulium mixtum/fuscum group. mortality increases in both species with increases in duration of exposure, concentration, temperature and ph. onset of death is shortened by increase in concentration and temperature ... | 1988 | 3193100 |
| the development of onchocerca spp. in simulium decorum walker and simulium pictipes hagen. | two species of nearctic black fly, simulium decorum and s. pictipes, exhibit partial susceptibility to infection with the bovine parasite, onchocerca lienalis, when inoculated intrathoracically with microfilariae. in addition, a proportion of s. decorum females will support the development of the human parasite, o. volvulus, to the third larvae stage. infection rates with second- or third-stage larvae seven or more days after varied among geographic strains of s. decorum, ranging from 6.5% in a ... | 1980 | 7233546 |
| complete generation rearing of simulium damnosum s.l. (diptera: simuliidae) in the laboratory. | a closed system of water circulation previously devised for rearing nearctic black flies was used for two cohorts of simulium damnosum s.l. (ghana strain). complete generation development from field-collected eggs occurred in both instances with the production of f1 adults and f1 pupae respectively. survival of larvae form the 3rd instar to pupation was extremely high for both parental and filial generations and ranged form 63-98%. in 3 of the 4 rearings (1p, 2p, 1f1), pupal survival ranged form ... | 1981 | 7256831 |
| entomopathogenic fungi of the order entomophthorales (zygomycotina) in adult black fly populations (diptera: simuliidae) in quebec. | infections by insect-pathogenic fungi of the order entomophthorales in two adult black fly populations were studied in the réserve faunique du saint-maurice (quebec). entomophaga near limoniae infected simulium verecundum/rostratum in june whereas erynia curvispora predominantly parasitized simulium decorum from the 2nd week of july to september and erynia conica attacked the simulium venustum complex, simulium verecundum/rostratum, and the simulium vittatum complex from may to september. the fu ... | 1994 | 7922891 |
| development of erynia conica (zygomycetes: entomophthorales) on the cuticle of the adult black flies simulium rostratum and simulium decorum (diptera: simuliidae) | aerial conidia of erynia conica were showered onto the wings of susceptible and nonsusceptible black fly, simulium rostratum and simulium decorum, respectively. secondary type 2 conidia as opposed to type 1 conidia and primary conidia invaded the wings of s. rostratum. the invasion process on both sexes of the host species was rapid, with 40% of the conidia germinating during the 2 hr that the wings were showered with conidia. approximately 24% of total spores developed appressoria close to the ... | 1996 | 8812568 |
| mermithids (nematoda: mermithidae) parasitizing different blackfly (diptera: simuliidae) populations in quebec: environmental parameters related to their presence or absence in the studied brooks. | specimens of isomermis wisconsinensis, gastromermis viridis, mesomermis flumenalis, and mesomermis camdenensis have been found in 14 out of 28 studied sites. their hosts were the following blackfly species: cnephia dacotensis, cnephia mutata, prosimulium sp., simulium decorum, simulium tuberosum, simulium venustum/verecundum complex, and simulium vittatum. superparasitism was observed in several simuliid larvae and, occasionally, with 2 different mermithid species. the prevalence of different me ... | 2008 | 18939698 |
| repellency of hydrogenated catmint oil formulations to black flies and mosquitoes in the field. | the essential oil of catmint, nepeta cataria l., was hydrogenated to yield an oil enriched in dihydronepetalactone (dhn) diastereomers, termed. this material was used for the preparation of liquid alcohol-based and lotion formulations. the efficacy of these formulations as repellents was tested after application to human test subjects at two locations in the united states: maine and florida. in maine, data on repellency of the hydrogenated catmint oil formulations toward black flies (simulium de ... | 2008 | 19058632 |
| laboratory colonization and life table statistics for geographic strains of simulium decorum (diptera: simuliidae). | colonization techniques were developed in order to select mating strains from four geographic populations of simulium decorum. although mating strains were established from each locale, emphasis was shifted toward developing permanent colonies from dryden lake, new york, usa and warm springs, georgia, usa. the net reproductive rate (ro) was computed for the parental, f1, and f2 generations of each strain in order to assess the effects of colonization through successive generations. ro increased ... | 1980 | 7233545 |