| parasites of domestic and wild animals in south africa. xxxi. adult ixodid ticks on sheep in the cape province and in the orange free state. | four to 10 dorper sheep on each of 12 farms in the cape province and 3 farms in the orange free state were examined for adult ixodid ticks at approximately 2- to 4-weekly intervals over periods varying from 4 to 18 months, commencing during january, february or april 1989. the farms in the cape province were located in the north-west, south-west and south of the province. those in the orange free state were situated in the north-east and in the south. the sheep in the cape province harboured 10 ... | 1992 | 1297957 |
| seasonal occurrence of karoo paralysis in angora goats in relation to the infestation density of female ixodes rubicundus. | the seasonal occurrence of karoo paralysis in relation to the infestation density of female ixodes rubicundus was investigated in an enzootic area of the southwestern orange free state, south africa. young and adult angora goats were exposed to infestation during two paralysis tick seasons. only the young goats became paralysed and their infestation densities (female ticks kg-1 host body weight) were significantly higher than those of healthy animals. the infestation densities on paralysed goats ... | 1992 | 1502788 |
| the seasonal activity of adult ixodid ticks on angora goats in the south western orange free state. | adult ixodid ticks were collected at 2-weekly intervals for a period of 23 consecutive months from 15 to 20 angora goats on a farm in the south western orange free state. a total of 6 ixodid tick species were recovered. rhipicephalus punctatus was the most abundant and prevalent tick. it was present from spring to late summer. ixodes rubicundus was the next most abundant tick and was present mainly from march or april to july with peak numbers present in april or may. the onset of this tick's ac ... | 1991 | 1770478 |
| spatial distribution of the karoo paralysis tick ixodes rubicundus (acari: ixodidae) within a false upper karoo veld type. | spatial distribution of the karoo paralysis tick (ixodes rubicundus) has been studied in a paralysis enzootic area of the southwestern orange free state. significantly more females than males were collected from the vegetation. most ticks (99%) used grass as questing sites at a height of approximately 45 cm (range 10-97 cm), which correlates with the size of host animals. no significant differences between the questing height of male and female ticks were evident. the ticks were found on most of ... | 1991 | 1860416 |
| parasites of cattle in the south western orange free state. | a number of young friesian oxen were slaughtered (one at a time) for parasite recovery for 12 consecutive months, from april 1987 to march 1988, on a farm in the fauresmith district of the south western orange free state. a total of 5 ixodid and one argasid tick species, 2 lice species, plus one nematode species and one cestode species, were recovered. peak numbers of adult hyalomma marginatum rufipes were present from november 1987 to february 1988, while the largest numbers of hyalomma truncat ... | 1990 | 2269986 |
| seasonal incidence of karoo paralysis in relation to the infestation density of female ixodes rubicundus. | the epidemiology of karoo paralysis, induced by the tick ixodes rubicundus, was investigated in a paralysis-enzootic area of the southwestern orange free state, republic of south africa. sheep became paralysed during the last week of april and the first week of may during the 1985 and 1986 seasons, respectively. paralysis cases were recorded up until july, but most paralysis cases occurred during the first week of may with a second but smaller peak occurring during june. tick numbers on paralyse ... | 1989 | 2815541 |
| the seasonal abundance of adult ixodid ticks on merino sheep in the south-western orange free state. | with the exception of october, when no collections were made, adult ticks were collected at weekly intervals from february 1986 to january 1987 from 20 randomly selected sheep out of a flock of 60. ixodes rubicundus was the most abundant tick and was present from april to september with a peak during may. hyalomma marginatum rufipes was the next most numerous tick. it was recovered throughout the year with peak burdens being recorded from november to april. small numbers of a rhipicephalus sp. ( ... | 1988 | 3210216 |
| seasonal dynamics of the karoo paralysis tick (ixodes rubicundus): a comparative study on merino and dorper sheep. | karoo paralysis in south africa is induced in livestock by feeding female ixodes rubicundus ticks when infestation densities on hosts exceed certain critical levels. it has been shown previously that angora goats are at a higher risk of being paralysed than merino sheep, and such differences have been related to differences in feeding behaviour and spatial distribution of the two small-stock breeds. we hypothesized that differences in infestation densities with karoo paralysis ticks would also o ... | 1996 | 9173358 |
| spatial and temporal variations in the commencement of seasonal activity in the karoo paralysis tick, ixodes rubicundis. | successful prophylaxis of paralysis, induced in small stock by feeding female ixodes rubicundus, is dependent on the accurate determination of the commencement of seasonal activity by the tick. the commencement of this activity was recorded for 11 consecutive years on a farm in the south-western free state, south africa, and for shorter periods on other farms, some of these in regions with markedly colder climates. the colder the mean minimum atmospheric temperatures during the 2 months precedin ... | 1996 | 9173361 |
| tick diversity, abundance and seasonal dynamics in a resource-poor urban environment in the free state province. | the objectives of this study were to determine the diversity, seasonal dynamics and abundance of ticks infesting cattle in urban, small-scale farming communities in and around botshabelo and thaba nchu in the eastern free state province, south africa. a total of ten cattle, ear-tagged for individual identification, were investigated monthly at each of five localities. adult ticks were removed from the right hand side of each animal and placed in containers filled with 70% ethanol. they were subs ... | 1998 | 10192844 |
| elephant shrews as hosts of immature ixodid ticks. | two hundred and seventy-three elephant shrews, consisting of 193 elephantulus myurus, 67 elephantulus edwardii and 13 animals belonging to other species, were examined for ixodid ticks at 18 localities in south africa and namibia. the immature stages of ixodes rubicundus, rhipicentor nuttalli, rhipicephalus warburtoni and a rhipicephalus pravus-like tick were the most numerous of the 18 tick species recovered. substantial numbers of immature rhipicephalus arnoldi, rhipicephalus distinctus and rh ... | 2005 | 16562732 |