February / March 2024

Alhoewel verpligte vereistes vir tafeldruifhantering na deregulasie weggeval het, het die eertydse riglyne steeds waarde vir produsente. Voor deregulasie was die Sagtevrugte-raad en Unifruco die alleenuitvoerders van Suid-Afrikaanse tafeldruiwe en het hulle dus die tegniese riglyne vir tafeldruifhantering voorgeskryf.

Margarodes are soil-dwelling scale insects that occur along the Lower Orange River in the Northern Cape and in certain areas in the Northwest, Limpopo, and Mpumalanga provinces.

False codling moths damage table grapes and many other crops. Chemical crop protectants are important to false codling moth control but environmentally friendly alternatives must be identified.

Hierdie artikel is ’n samevatting van tegniese inligting wat deur besproeiingspesialis Karen van der Westhuizen van Agrimotion verskaf is. Dr Johan van Zyl van die Departement Grondkunde aan Universiteit Stellenbosch het ook bygedra.

“In die laaste 10 jaar wat ek hier is, was daar nog nie een jaar of een blok waar ek kan sê droogte ’n effek op die produksie of kwaliteit van ons oes gehad het nie,” vertel Recardo Vrey, produksiebestuurder by Arborlane Landgoed se Weltevrede-plaas in die Koue Bokkeveld. Weltevrede het ongeveer 86 hektaar appel- en peerboorde. “Een van die groot uitdagings hier is water,” sê Vrey. “Ons water kom bo uit die berg – ons is uit-en-uit afhanklik van reën.”

Die eerste drupbesproeide blok by Monteith se Transpalmietplaas in Grabouw was Rosy Glow op M.9 EMLA wat teen 3.0 x 1.0 meter in 2018 op nat, sanderige grond gevestig is. Die leerkurwe was vir die eerste drie jaar steil, onthou Ernst Heydenrych, algemene bestuurder by Monteith Trust.

Dr Samuel Ortega-Farias is the director of the Research and Extension Centre for Irrigation and Agroclimatology and a professor in the School of Agronomy in the Faculty of Agricultural Sciences at the University of Talca in Chile.

The Citrus Improvement Scheme (CIS) ensures the availability of disease-free budwood that is horticulturally true to type and of superior quality, for the propagation of trees in SA.

Biosecurity is at the core of the Citrus Research International mission to maximise the long-term global competitiveness of citrus growers in Southern African. By Paul Fourie, Wayne Kirkman, Elma Carstens and Vaughan Hattingh

Huanglongbing (HLB), or Asian Citrus Greening, is caused by the bacterium Candidatus Liberibacter asiaticus, which is mostly spread by the insect vector Asian Citrus Psyllid (ACP), Diaphorina citri. As a well-publicised example, HLB has destroyed >80% of the US Florida citrus industry, where growers did not strictly follow the best-practice control measures.

The primary inoculum (ascospores) produced in leaf litter on the orchard floor, after the leaves have been exposed to suitable environmental conditions, is discharged during wet periods.

Growers should be scouting for mealybug regularly by inspecting underneath calyces, thereby determining the percentage of infested fruit.