A closer look at the tree trunk shows dark patches which confirm a shot-hole-borer infestation. Photo: Naidine Sibanda
Interest and curiosity about the 2mm beetle that has managed to destroy a number of trees have grown in residents. Houghton residents joined in the walkabout which was preceded by an informative talk on the shot-hole-borer beetle. The talk and walk were arranged by the Lower Houghton Residents Association which brought in an expert to enlighten the community members.
Expert and arborist Anton Moller said that researchers reckon the beetle came through shipping. He said the beetle simply digs a hole in the tree and then lives in the tunnels; feeds on the tree and inoculates a fungus which invades the vascular tissues of the tree. “So, the fungus is the one which actually kills the tree,” explained Moller.
Houghton residents are taught more about the polyphagous shot-hole borer by expert and arborist Anton Moller. Photo: Naidine Sibanda
He added that the chemical used to treat the infestation is not registered yet in South Africa so it is actually illegal to use. “It is important to understand that we will lose some trees and we have already lost some trees. The Forestry and Biodiversity Institute (Fabi) at the University of Pretoria reckons we have no chance of eradicating it, we can only manage it. So, it’s well established and is not going anywhere.”
Residents walk about and observe some infected plane trees. Photo: Naidine Sibanda
He, however, said that there are things residents can do to manage the invasion by the beetle. He said they can make sure their trees are as healthy as possible by mulching, fertilising and watering them as they will then be less susceptible to any pest or disease and if infested, be best equipped to deal with the pest.
A closer look shows tiny holes bored by the fungus-carrying beetle into tree stems. Photo: Naidine Sibanda
Smaller trees, young trees and trees with low infestation levels may warrant treatment. Moller warned,
“Before you treat, understand the limitations of any and all treatments available, and if you do decide to treat trees, do so responsibly and with great care.”
A closer look at the tree trunk shows dark patches which confirm a shot-hole-borer infestation. Photo: Naidine Sibanda
He encouraged community members to do whatever they can to promote awareness of the problem by:
Using social media platforms
Send a location, photo with borer holes clearly seen as well as the name of the tree if you know it to the Johannesburg City Parks and Zoo WhatsApp number 064 756 2736
Download the Tree Survey App from the website www.pshb.co.za to report infested trees.
Moller said the cost of the research by Fabi could cost about R20 million so those willing to assist financially can contact them by visiting www.fabinet.up.ac.za
