The parasitoid Cotesia icipe may offer biological control against the fall armyworm. DR ROBERT COPELAND
Insect pests, such as maize stem borers and fall armyworm, increasingly challenge food production around the world.
Huge demands for crops have meant agricultural systems have simplified and frequently focused on single crops. In monocropping systems, when fields are full of a single crop, they can easily be found by their insect pests, as opposed to when mixed cropping is practised. Because of this, higher yield losses have more chance to occur in monocropping systems.
Climate change, which is mostly associated with increased temperatures and changes in rainfall patterns, as well as wild habitat reduction by farmers, have added to this by increasing pest pressure and resurgence.
The rapid evolution of pest resistance to chemicals, an increasing organic food market, and the negative effects of chemicals on the health of people and the environment, have increased the need to control insect pests biologically.
Insect predators
Biological control uses live organisms, such as insect predators, to kill or eat insect pests. Insect parasitoids are one form of biological control. These are insects that develop as parasites on other arthropods, mostly insects, causing their death or sterility.
They can target each developmental stage of the insect (eggs, larvae or pupae). These parasitoids have received increased attention because they are efficient, cheaper and offer a management strategy that safeguards human health and the environment.
Denne historien er fra May 15, 2020-utgaven av Farmer's Weekly.
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Denne historien er fra May 15, 2020-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.
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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.
