The ARP at FABI offers a disease clinic to avocado growers for the identification of avocado diseases. A consultation fee will be charged accordingly.


 How to sample?

  • Take a photo of the symptoms, if possible
  • Samples should be taken from 4-5 randomly selected plants in an infection site.
  • Place the samples separately in a paper bag (Never use a plastic bag!!)
  • Seal the bag and label with the following: Collectors name, date, sample number, locality and cultivar

Specific tissue sampling

  • Collect individual leaves, place between blotting paper (paper towel) and in an envelope
  • Collect a sample that spans the diseased area, including +/- 2cm of healthy tissue on either side of the lesion
  • Place in a paper bag
  • Collect 200g of soil from under the diseased tree at a depth of 10-15 cm, place in a paper bag
  • Collect root pieces (healthy and diseased) from the soiland place in an envelope
Send the samples by fast mail or courier to the Avocado Disease Clinic @ FABI and give us a phone call to let us know to expect a parcel from you.
Prof Noëlani van den Berg
74 Lunnon street
Avocado Research Programme
University of Pretoria
012 420 3856

082 775 4983


New Publications

Engelbrecht J, Duong TA, Prabhu AS, Seedat M, van den Berg N. (2021) Genome of the destructive oomycete Phytophthora cinnamomi provides insights into its pathogenicity and adaptive potential. BMC Genomics 22:302. 10.1186/s12864-021-07552-y
Van den Berg N, Swart V, Backer R, Fick A, Wienk R, Engelbrecht J, Prabhu S. (2021) Advances in understanding defense mechanisms in Persea americana against Phytophthora cinnamomi. Frontiers in Plant Science 12:123. 10.3389/fpls.2021.636339
Mufamadi Z, Fourie G, Willis-Boyum A, van den Berg N. (2020) Husk rot disease: causal agents and disease epidemiology. SAMAC Journal PDF
Welgemoed T, Pierneef R, Sterck L, Van de Peer Y, Swart V, Scheepers KD, Berger DK. (2020) De novo assembly of transcriptomes from a B73 maize line introgressed with a QTL for resistance to gray leaf spot disease reveals a candidate allele of a lectin receptor-like kinase. Frontiers in Plant Science http://bit.ly/2SmKPmT
Van den Berg N, Du Toit M, Morgan SW, Fourie G, De Beer ZW. (2019) First Report of Fusarium euwallaceae on Persea americana in South Africa. Plant Disease 10.1094/PDIS-10-18-1818-PDN