Mr Johannes Christoff Joubert

PhD student


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Primary Supervisor
Almuth Hammerbacher

Co Supervisor
Brett Hurley

I began my BSc Biotechnology degree at the University of Pretoria in 2014 and graduated in 2016. I then joined the Forestry and Agricultural Biotechnology Institute (FABI) in 2017, where I began working on my BSc(Hons) Microbiology degree under the supervision of Dr. Almuth Hammerbacher. During my honours I conducted an extensive phenotypic investigation into the metabolisms of different members of the Ceratocystis fimbriata s.l., to determine whether the observed host specificity within this species complex is due to the differences in the metabolisms of these fungi. Furthermore, I also conducted a comparative genomic analysis to determine the genetic basis of these metabolic differences.


In 2018 I began working on my MSc Zoology and Entomology degree. This degree was focused on identifying the constitutive metabolites of Eucalyptus trees which underlie the host preference of the Eucalyptus snout beetles (Gonipterus sp. n. 2). In 2020 I began working on my PhD Zoology and Entomology degree. In this degree I will be working on the Tri-trophic interactions of Gonipterus sp. n. 2, were I will be trying to elucidate the induced defence response of Eucalyptus to both feeding and oviposition by Gonipterus sp. n. 2 and to understand how this defence response affect Anaphes nitens. Furthermore, I will investigate the effect of the host plant genotype on the chemical composition of the Gonipterus eggs, and the effect these differences will have on Anaphes nitens. Lastly, I will attempt to utilize field data to generate a mathematical model to predict the effects of the constitutive Eucalyptus metabolites on Gonipterus populations and feeding damage.