There are probably three different tick species within the sourveld tick group (Ixodes pilosus), of which only one has been described. The female is similar in appearance to the Karoo paralysis tick (Ixodes rubicundus), but the auriculae protrude laterally on the ventral side of the basis capituli, and there are spurs on the first pair of coxae. The alloscutum bears four longitudinal rows of long, stout setae dorsally. The posterior alignment of the anal groove is short and converging. In the male, the genital aperture is present in an inverted U-shaped area formed by the ventral shields.
The sourveld tick is present in the southeastern sourveld coastal regions of the Western and Eastern Cape, around Nelspruit, and near Polokwane. It is a three-host tick, with adults present in summer, larvae in autumn and nymphs in spring. This species is not known to transmit diseases.
All stages of development of I. pilosus infest cattle, sheep, dogs, grey rhebok, bushbuck, caracal, and scrub hare. It attaches around the head.
KAROO PARALYSIS TICK
I. rubicundus is a strictly South African tick and has a reddish-brown colour. It can be found in the Karoo, southern Free State, and in small areas near Bronkhorstspruit, Belfast, and Heidelberg.
The presence of hilly or mountainous veld and of the wild olive tree (Olea europaea subsp africana), the besembos shrub (Searsia erosa), and wire lemongrass (Elionurus muticus, or suurpol) all support the existence of the tick. The ticks also prefer the southern slopes of hills to the northern slopes, as the former are cooler.
Adults feed on sheep, goats, dogs, caracals, and mountain reedbuck. Immatures are found on rock elephant shrews, red rock rabbits, and caracals. Females are present in the wool line on the limbs and bellies of sheep. Males rarely attach to host animals but are frequently found attached to females.
Denne historien er fra December 02, 2022-utgaven av Farmer's Weekly.
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Denne historien er fra December 02, 2022-utgaven av Farmer's Weekly.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
Allerede abonnent? Logg på
New farmers' seedling pitfalls
Inexperienced farmers may be tempted to grow seedlings from seed themselves, but they have much to gain by trusting a seedling grower at a nursery to perform this task for them instead
South African avocado production: a success story
Avocado production in South Africa has expanded markedly since the industry's humble beginnings over 80 years ago. From a small grove planted in 1938 in what was then Nelspruit, the industry has blossomed to seven million trees planted on 20 000ha. Dr Guy Witney, project manager at Great Brak Avos, spoke to Annelie Coleman about the country's avocado production.
Unlocking value through livestock exports
Exporting livestock might sound like a daunting business that's better left for big companies, but Gerrie Ferreira, who farms near Oudtshoorn in the Western Cape, has been doing it successfully for almost 30 years, sometimes in partnership with other breeders. He spoke to Glenneis Kriel about the huge potential this market holds, and offers some advice for farmers who are contemplating going this route.
An agribusiness's dedication to community upliftment
For agribusiness NWK, located in Lichtenburg, North West, corporate social investment is an important part of creating a positive influence alongside financial returns. Johan Bezuidenhout, NWK’s group manager of corporate marketing and communication, spoke to Annelie Coleman about why the company chooses to invest millions of rands in the area it operates in every year.
Empowering dreams, transforming lives
Since its launch in 2013, the Agri's Got Talent competition has revolutionised the lives of many farmworkers by unlocking their hidden talents and fostering a culture of empowerment. Glenneis Kriel spoke to various finalists about how the contest has changed their lives.
Foreign investment: agriculture maintains its appeal
South Africa remains a popular destination for foreign investors, despite an often negative outlook from its citizens. It is a gateway to Africa, and with its counterseasonal production to the Northern Hemisphere and favourable weather, local agriculture is especially well placed to attract foreign interest, bringing with it hope for rural communities
The real value and message of COP29 for SA agriculture
While the 2024 Conference of the Parties may have disappointed those who hoped for real progress, it's more important for South African agriculture to highlight its role in carbon mitigation
Improving efficiencies in feed and grain milling
Bühler, a Swiss-based company that provides solutions and equipment for various industries, including food and animal feed processing, has pledged that by 2025, it will deliver scalable solutions that will reduce energy, waste and water by 50% in the value chains of its customers.
Tips for better olive production
At an SA Olive Association field day in November, industry experts shared ways to improve olive production efficiencies, from soil preparation to harvesting.
More effort needed to protect vulnerable cheetah
On International Cheetah Day, commemorated every year on 4 December, emphasis was placed on the vulnerability of the species.
