The adult stage of L. huidobrensis is a very small fly, comparable in size with the familiar vinegar flies (Drosophila spp) attracted to overripe fruit. L. huidobrensis lays its eggs in the leaves of the host plant, lettuce being much favoured. It also causes lesions in the leaves to feed on the sap, and these are seen as small, white spots.
The hatched larvae make unsightly serpentine tunnels through the leaves, making the lettuce unmarketable.
RANGE OF PARASITOIDS
The chemical abamectin was found to reduce leaf miners to manageable levels, while having a minimal effect on beneficial insects. I started using this product on my cucurbits, beans and beet, and found that while it helped a great deal, it did not eliminate the pest.
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Sugar cane and cash crop rotation helps improve soil health
Decades of monocropping has compromised soil health on many South African sugar cane farms, negatively affecting their productivity. Dreyer Senekal, co-director of Senekal Familie Boerdery, explains to Lloyd Phillips how he is experimenting with strategic crop rotation to improve the soil of his sugar cane enterprise.
Tuberculosis in cattle
Tuberculosis is an important zoonotic disease that spreads slowly in animal populations.
Is it time to relook water governance in South Africa?
The number of rivers in South Africa deemed to be in a poor ecological state has increased alarmingly in recent times. James Brand, a senior associate at ENSafrica’s Natural Resources and Environment department, argues that the many frustrated citizens affected by contaminated water supplies might be better served by new, independent water governance structures and amendments to the country’s water laws.
The influence of weather on lucerne hay quality
There is still limited research available on the effects of weather on lucerne production in South Africa, This article, written by lucerne specialist Dr Gerrie Scholtz, agricultural economist Walter van Niekerk, and others, was published by the National Lucerne Trust and offers some insight on the matter, based on recent observations.
Superior goats and award-winning cheeses
Rina Belcher runs Belnori Boutique Cheesery, a Saanen goat-breeding and cheesemaking operation near Bapsfontein in Gauteng. Pieter Dempsey spoke to her about raising her animals and creating a diverse range of products, including soft and hard cheeses, a number of which have garnered prestigious awards.
Strategic planning for families in business
When carrying out estate planning, a family business owner may be concerned only with who will inherit the business and how it will be transferred. More is required, says Trevor Dickinson; planning has to consider the family’s desires and intentions for the business, as well as strategies for the future of the operation.
Painted Persians carry sheep farmer through drought
The demand for multicoloured Persian sheep in the Middle East has helped Northern Cape breeder Koenie Kotzé endure the drought. Annelie Coleman reports on how he discovered this market.
Case IH introduces tougher, rust-resistant paint with a deeper shine
Additions to the paint shop facilities at the Case IH St Valentin tractor plant in Austria have resulted in longer-lasting paintwork on the company’s tractors. Advanced techniques now ensure that the paint adheres more tightly to metal surfaces, making the paintwork more resistant to scratching, cracking and rusting.
An endangered bird is forgetting its song
Researchers from the Australian National University have found that in areas where there are very small populations of the critically endangered regent honeyeater, the songs of the remaining wild males vary remarkably. Tragically, in some cases, the birds have even adopted the songs of other species.
Add veggie oil to your horse feed
By giving your horse vegetable oil, you will improve its coat and condition, without the side effects of high sugar rations, says Dr Mac.