Earth Day with Vision Afrika


  • Citizen Science
  • Engagement
  • Phytophthora
  • Sample Collection
  • Education
  • Community Conservation
  • Plant Pathology

"Is this community conservation or environmental education?" asked Adam, a CPUT Work Integrated Learning student who volunteered his Earth Day with us this year. We answered: "Well... that's the great thing about citizen science, its both".

Cape Citizen Science is community conservation and environmental education smashed together to facilitate biological research about plant disease in the Cape Florisitc Region. This past weekend is a great example of what we're talking about. On Saturday, Earth Day, we provided an opportunity for 31 learners to release their inner scientist as citizen scientists in Jonkershoek Nature Reserve.

The story begins with some generous backers of a crowdfunding campaign on experiment.com. In February 2017, many individuals contributed funding so that we could cover the costs to engage youth from Kayamandi in our research. We also recevied financial support from the American Phytopathological Society through the Mathre Education Endowment Fund and the Promotion Fund from the British Society for Plant Pathology.

Thanks to those backers and awards, we were able to transport and provide food for 31 learners to travel to Jonkershoek Nature Reserve.

The youth we engaged are scholars involved in the after school learning program Vision Afrika. Spending Earth Day with us was a reward for spending the previous three saturdays studying at the Vision Afrika centre in Kayamandi.

Vision Afrika is an incredible program that fosters the success of many learners through after school learning activities and opportunities. On Saturday, we met with the learners at Vision Afrika and drove to the Cape Nature offices at Jonkershoek Nature Reserve.


Before our activity in the field, we started with a presentation in a Cape Nature conference room. The presentation introduced the learners to the reasons we do research, the importance of biodiversity, and the threats to the fynbos. We also introduced the concept of pathogen hunting, our earth day activity to sample diseased plants in the reserve. 

To involve the learners fully in the scientific process we generated a hypothesis to test during the activity. We hypothesized that we would find a greater diversity of Phytophthora species adjacent to a trail that received heavy traffic compared to a trail that had less traffic.

To test this hypothesis we chose two trails, a very popular trail to a waterfall, and a long and less popular trail called the Panorama hiking trail.

We set out into the beautiful Jonkershoek Nature Reserve after the presentation.

The field component of the activity involved hiking 30 minutes on two seperate trails, starting from the 10km loop road in the middle of the reserve.

We also made sure to take a few minutes to talk about the ecology and disturbances we saw. The first hike had lots of evidence of fire.

During the hikes we collected samples of sick looking plants along or close to the trails. Everyone collected at least one sample between the six different sites we stopped at (3 sites per trail).

We needed a break after the hikes so we hung out on the Eerste river for a bit.

Finally, it was time to Braai! So we headed back to the picnic area in the Assegaaibosch Nature Reserve. But the Science continued, we still needed to isolate pathogens from the sick plants we sampled.

After a quick demonstration, the learners took their pathogen hunting skills to the next level as they began primary isolations. For this, we cut small pieces of the infected plants and placed them into petri-plates containing 'pathogen food' (agar suspended maize meal).

By the end of the activity we had completed primary isolations for 72 samples. Incredible!

We consider Earth Day with Vision Africa a huge success and are grateful for the support we received from our backers, the American Phytopathological Society, and the British Society for Plant Pathology, and most especially, the Forestry and Agricultural Biotechnology Institute.

This is the first of many engagement activities with learners from impoverished communities. We look forward to doing it again. If you would like to contribute or join in the next one, please contact us.

Photo credit: Michelle Agne and Joey Hulbert 


Hunt'n Pathogens w/ Se7en


  • Citizen Science
  • Kirstenbosch
  • Phytophthora
  • Se7en
  • Engagement

We had an incredible time hunting pathogens in Kirstenbosch National Botanical Garden with a group of home school students (Se7en) in early November. The students were avid learners and natural citizen scientists, contributing much excitement to the afternoon's research extravaganza.

We spent the afternoon with two of the garden managers who have been battling root rot pathogens—microorganisms that attack plant roots and cause disease. The managers were kind enough to save some of the diseased plants for us to sample. Below are a few photos of us collecting plant samples. Each student collected at least one sample.

A citizen scientist using a knife to expose a lesion likely caused by Phytophthora cinnamomi. When isolating Phytophthora, we tried to collect pieces along the margin of living and dying tissue, because this was where the pathogens were still active. It was also critical to sterilize equipment/tools in between samples, to ensure we were not spreading the pathogens or contaminating our samples. 

We sterilized our tools in between samples by dipping the blades in ethanol and heating them with a lighter. Bleach or rubbing alcohol would also work. It was fun, but also educational!

We collected samples of leaves, stems, and roots for many different plant species present within the Proteaceae garden. Everyone had collected at least one sample by the end of the afternoon.

After collecting samples of dying plants, the next step was to try to isolate a species of Phytophthora. Phytophthora are not the only microbes causing disease in the fynbos, but it is the group that we are focusing on for our research. Phytophthora species cause serious issues around the world (e.g. Sudden Oak Death and the late blight of potato), and there is a lot to be learned about them in the fynbos. For more information about Phytophthora, see our previous blog post:

To isolate Phytophthora from our dying plant samples, we cut small pieces along the disease margin and placed them into selective agar media. This media has all of the nutrients that Phytophthora need, as well as some antibiotics to prevent growth of other fungi we are not interested in.

After we place the plant tissue pieces in the selective agar media, we watch carefully and replate the organisms that look like Phytophthora until we have a pure culture. Sometimes it takes many isolations before we have a pure Phytophthora culture.

We hope you enjoyed this blog post. Please contact us if you would like to organize a similar activity! Special thanks to Se7en and the managers at Kirstenbosch for a epic afternoon!

If you would like to see the activity from Se7en's perspective, you can see their incredible blog post about the afternoon here!

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