The Macadamia Protection Programme (MaPP) was established in 2017 as collaborative initiative between Macadamia South Africa NPC (SAMAC), the Forestry and Agricultural Biotechnology Institute (FABI) and the University of Pretoria. The programme is headed by Dr Gerda Fourie, with the major research focus on macadamia plant diseases and pests.

Macadamia is one of the fastest growing agricultural industries in the country and is of economic importance to South Africa. The industry is however hampered by a number of pests and diseases which can cause major economic loss, both in terms of yield as well as nut quality. The industry currently relies heavily on the use of commercially available pesticides and chemicals for pest and disease control.

Research conducted within the MPP aims to develop and improve pests and diseases management. These strategies may range from the introduction of natural enemies or biological control, disruption of the pest’s reproductive systems, planting of resistant cultivars as well as timely application of chemicals or pesticides. Effective implementation of these, are built on information regarding pest identity, population dynamics, disease cycle, infection biology, epidemiology and spread. Such information, however, is often lacking or not well understood. The current research focus areas of the MaPP will aim to fill these knowledge gaps.

 

New Publications

Karsten M, Fourie G, Roets F, Javal M, Terblanche J, Dittrich-Schröder G, Bierman A. 2026. Genetic Toolkits for IPM. In: Principles of Integrated Pest Management. Terblanche J, Karsten M. (eds). CABI, pp 294-319.
Magagula P, Swart V, Fourie A, Vermeulen A, Nelson JH, van Rooyen Z, van den Berg N. (2025) Avocado rhizosphere community profiling: white root rot and its impact on microbial composition. Frontiers in Microbiology 16 10.3389/fmicb.2025.1583797
Maduke N, Slippers B, Van der Linde E, Wingfield M, Fourie G. (2025) Botryosphaeriaceae associated with racemes, fruits and leaves of macadamia in South Africa. Plant Pathology 0:1–15:1–15. 10.1111/ppa.14107
D’Angelo D, Hu H, Lahoz E, Risteski J, Steenkamp E T, Viscardi M, van der Nest M A, Wu Y, Yu H, Zhou J, Karandeni Dewage C S, Kotta-Loizou L I, Stotz H U, Fitt B D L, Huang Y, Hu Y, Kiss L, Sorrentino R, Nkomo T, Zhou X, Vaghefi N, Sonnekus B, Bose T, Cerrato D, Cozzolino L, Creux N, D’Agostino N, Fourie G, Fusco G, Hammerbacher A, Idnurm A, Wingfield BD. (2025) IMA GENOME - F20 A draft genome assembly of Agroathelia rolfsii, Ceratobasidium papillatum, Pyrenopeziza brassicae, Neopestalotiopsis macadamiae, Sphaerellopsis filum and genomic resources for Colletotrichum spaethianum and Colletotrichum fructicola. IMA Fungus 16:e141732. 10.3897/imafungus.16.141732
Matsetela M, Fourie G. (2025) Halt the rot! The quest for effective fungicide compounds in vitro against husk rot pathogens. SAMAC Journal :150-154.
Mkhize T, Fourie G. (2025) Following the guts: Uncovering stink bug alternative plant hosts and movement through gut content analysis. SAMAC Journal :161-164.
Moffat R, Fourie G. (2025) Towards biological control of macadamia felted coccid. SAMAC Journal :119-122.
Raaths D, Fourie G. (2025) Macadamia leaves as a source of inoculum for dry flower disease. SAMAC Journal :127-128.
Van den Berg J, Fourie G. (2025) Characterization of fungal symbionts associated with bark and ambrosia beetles in macadamia orchards in South Africa. SAMAC Journal :137-140.
Maduke N, Slippers B, Van der Linde E, Wingfield M, Fourie G. (2024) Botryosphaeriaceae species associated with branch dieback and decline of macadamia trees in South Africa. Australasian Plant Pathology :1-16. 10.1007/s13313-024-00992-6
Twiddy D, Fouché A, Akinsanmi OA, Fourie G. (2024) Biology and pathogenicity of fungi causing husk rot of macadamia in South Africa. European Journal of Plant Pathology :1-18. 10.1007/s10658-024-02915-z
Jami F, Duma S, Fourie G, Schoeman M. (2024) First report of Botrytis cinerea causing flower blight on macadamia in South Africa. Journal of Phytopathology 72:e13325.:1-4. 10.1111/jph.13325
Pal E, Allison J, Hurley BP, Slippers B, Fourie G. (2024) Lethal and sublethal effects of insecticides on Bathycoelia distincta (Heteroptera: Pentatomidae). African Entomology 32: e16992:1-9. 10.17159/2254-8854/2024/a16992
Botha G, Fourie G. (2024) In vitro screening of fungicidal compounds for control of dry flower disease and green mould in macadamia orchards. SAMAC Journal :149-151.
De Beer W, Fourie G. (2024) Five years of PSHB research on Pecans: what have we learned? . SA Pekan 97:6-10.
Fourie G. (2024) Disease diagnostic clinic and field extension: a service to the macadamia industry. SAMAC Journal :131-132.
Mkhize T, Fourie G. (2024) Surface sterilization of stink bug egg capsules as an alternative control option. SAMAC Journal :131-132.
Moffat R, Fourie G. (2024) Ecological niche modelling to predict areas that are suitable for macadamia felted coccid establishment in South Africa. SAMAC Journal :137-138.
Moffat R, Fourie G. (2024) Natural enemies as candidate for biological control of macadamia felted coccid in macadamia orchards in South Africa. SAMAC Journal :135-136.
Seedling diseases: s survey of macadamia nurseries in South Africa
Twiddy D, Matsetela M, Fourie G. (2024) Seedling diseases: s survey of macadamia nurseries in South Africa. SAMAC Journal :83-85.
Fourie A, Venter S, Slippers B, Fourie G. (2023) Pantoea bathycoeliae sp. nov and a Sodalis sp. are core gut microbiome symbionts of the two-spotted stink bug. Frontiers in Microbiology :1-19. 10.3389/fmicb.2023.1284397 PDF
Fourie G, Mkhize T, Twiddy D. (2023) Bark and Ambrosia beetles and their fungal symbionts in macadamia orchards in South Africa. SAMAC Journal :78-79.
Twiddy D, Akinsanmi F, Fourie G. (2023) Towards management of macadamia nut diseases in South Africa. SAMAC Journal :80-81.
Fourie G. (2023) Disease diagnostic clinic and field extension: a service to the macadamia industry. SAMAC Journal :96-97.
Moffat R, Hurley BP, Fourie G. (2023) Biology of the invasive macadamia felted coccid, Acanthococcus ironsidei Williams (Hemiptera: Eriococcidae) and potential native enemies as biological control agents. SAMAC Journal :82-83.
Smith A, Fourie G. (2023) The Macadamia nut borer genome: What are the benefits?. SAMAC Journal :84.
Pal E, Allison JD, Hurley BP, Slippers B, Fourie G. (2023) Life History Traits of the Pentatomidae (Hemiptera) for the Development of Pest Management Tools. Forests 14(5) 10.3390/ f14050861 PDF
Pal E, Fourie G. (2023) Evaluation of the lethal and sublethal effects of various insecticides on Bathycoelia distincta (Heteroptera: Pentatomidae). SAMAC journal :51-53.
Wingfield BD, Berger DK, Coetzee MPA, Duong TA, Martin A, Pham NQ, Van den Berg N, Wilken PM, Arun-Chinnappa KS, Barnes I, Buthelezi S, Dahanayaka BA, Durán A, Engelbrecht J, Feurtey A, Fourie A, Fourie G, Hartley J, Kabwe ENK, Maphosa M, Narh Mensah DL, Nsibo DL, Potgieter L, Poudel B, Stukenbrock EH, Thomas C, Vaghefi N, Welgemoed T, Wingfield MJ. (2022) IMA genome‑F17 Draft genome sequences of an Armillaria species from Zimbabwe, Ceratocystis colombiana, Elsinoë necatrix, Rosellinia necatrix, two genomes of Sclerotinia minor, short‑read genome assemblies and annotations of four Pyrenophora teres isolates from barley grass, and a long-read genome assembly of Cercospora zeina. 13:19. 10.1186/s43008-022-00104-3