South African Avocado Growers’ Association
2024 Yearbook
Volume 47

Table of Contents

3 Chairman's Report
Edrean Ernst

HORTICULTURE

8 Supporting Crop Establishment and Trees in Established Avocado Orchards by Way of Combined Use of Biological and Chemical Solutions
Estiene Jordaan and Freddie Denner

28 Advanced Techniques for Assessing Phytophthora Root Rot (PRR) Severity in Avocado Orchards: Proximal and Remote Sensing Approaches
Carlos Poblete-Echeverría, Sally Duncan1, Adéle McLeod and Talitha Venter

32 Diagnosing Avocado Pollen Abnormalities by Using a New Novel Counting Methodology
Elsa S. du Toit

34 The Third Season of Harvista (AgroFresh) Spray Trials Indicate That, Under Certain Conditions, Fruit Size and Yield Improvements Are Also Obtainable in Addition to the Postharvest Outcomes
Frans J. Kruger, G. Otto Volschenk and Emé Volschenk

44 More Fruits Were Set by Application of Iodine with Potassium Nitrate as Soil Application In 'Maluma Hass' Avocado in Tzaneen
Katja Hora, Duncan Napier, Suzette Smalberger and Steve A. Oosthuyse

PATHOLOGY

54 The Role of Honey Bees in the Spread of Avocado Sunblotch Viroid (ASBVd)
Elize Jooste

56 A Closer Look into the Impact of Avocado Sunblotch Viroid on Avocado Production
Elize Jooste

60 South African Avocado Orchards Face Threat from White Root Rot Pathogen
Noëlani van den Berg, Jesse Hartley and Robert Backer

POST-HARVEST

62 Green Synthesis of Zinc Oxide Nanoparticles Using Moringa oleifera Leaf Extract and Its Antifungal Effect Against Colletotrichum gloeosporioides in Avocado
Sibonelo Ngubane, Nomzamo Dyantyi, Samson Zeray Tesfay, Lembe Samukelo Magwaza and Asanda Mditshwa