August 21, 2019

Latest:

Nkosi City – R7.8bn ‘agri-city’ for the future in Mpumalanga -

Friday, August 16, 2019

CONSTRUCTION OF BOPHELONG CLINIC ON TRACK FOR EARLY 2020 COMPLETION -

Friday, August 16, 2019

Cape Town’s dam levels passes the 80% mark -

Friday, August 16, 2019

TOWERING ACHIEVEMENT FOR CO-ARC’S WOMEN ARCHITECTS -

Wednesday, August 14, 2019

dhk Architects- Landscape Architect wanted! -

Friday, August 2, 2019

Ethiopia plants world-record 350 million trees in 12 hours -

Friday, August 2, 2019

Snøhetta reveals new Madiba-inspired “peace bench” -

Friday, August 2, 2019

CPUT’s 2019 Enactus team bags six national awards! -

Friday, August 2, 2019

More than 30 developments are in the pipeline for Cape Town’s CBD -

Thursday, August 1, 2019

The 16th Annual Evergreen Turf Turf Day -

Friday, July 26, 2019

Global architecture honour for UCT professor -

Friday, July 26, 2019

Caretakers secure their future by saving Hout Bay dunes -

Friday, July 26, 2019

Have you signed on to attend FutureScape Africa 2019? -

Friday, July 19, 2019

City’s skills development programme cultivates future environmentalists -

Friday, July 19, 2019

NOMA sculpture garden extension features outdoor theatre and submerged walkway -

Friday, July 19, 2019

Massive Cornubia development begins -

Friday, July 19, 2019

New R20m V&A Waterfront swing bridge now open -

Friday, July 12, 2019

Green Developments- Construction with the environment in mind -

Friday, June 21, 2019

Outdoor gym launched -

Friday, June 21, 2019

Mall of the West kicks off Ntshongweni Urban Development -

Thursday, June 20, 2019

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POLYPHAGOUS SHOT HOLE BORER- PSBH.CO.ZA

Online resource for Polyphagous Shot Hole Borer (euwallacea fornicatus)

TREATMENT

We have just published the SHOT HOLE BORER “WHAT TO DO” GUIDE that contains a practical guideline on the options that are available for private residents to treat their own trees. This guide does not endorse any specific products, nor does it represent an easy solution to the PSHB crisis South Africa is currently experiencing.

View the guide herePSHB.co.za/what-to-do/

A combination of insecticides and fungicides is required

The Department of Agriculture, Forestry and Fisheries is in the process of declaring PSHB an invasive pest, this status will allow emergency registration of chemical treatments under Act 36.

Currently there are no chemicals products registered for treatment against PSHB in South Africa. Chemical formulations with specific active ingredients have been shown to be effective in US trials, no recommendation is made to use then – local chemical companies need to register their own formulations for use against PSHB under Act 36.

Common sense needs to be combined with practical experience. Contact your local nursery and inquire about available products that can boost your tree’s health.

The following article details a US study to evaluate treatment options against the polyphagous shot hole borer beetle, and provide insights into the need for a combination of injection and contact treatment:

2017-05-22
National Center for Biotechnology Information – Journal Article
Evaluations of Insecticides and Fungicides for Reducing Attack Rates of a new invasive ambrosia beetle (Euwallacea Sp., Coleoptera: Curculionidae: Scolytinae) in Infested Landscape Trees in California
The combination of a systemic insecticide (emamectin benzoate), a contact insecticide (bifenthrin), and a fungicide (metconazole) provided some level of control when applied on moderate and heavily infested trees.

Click here for more specialist articles on treatment..

Public Trees vs Private Trees

Viability of treatment protocols differ between public and private trees, poison exposure needs to be considered and cost-benefits evaluated. The total cost of loosing a mature urban tree needs to be measured against the costs of removal, replacement and maintenance time to reach maturity.

In 2010 the “Greening Soweto” project was launched which aimed to plant more than 300,000 trees – this project was supported by Johannesburg City Parks as a fundamental trans-formative initiative for the city – now that these trees have been found to be infested by PSHB they require urgent treatment.

Mature urban trees such as the London Plane trees that encircle the entire Johannesburg Zoo are under attack – will these giant trees simply be chopped down, or will policy make provision for heritage public trees to receive treatment?

Many streets in Johannesburg are now lined with dead trees, these must be removed and the infested wood disposed of responsibly. City Parks need to create controlled sites where infested wood can be burnt so that the beetles within do not emerge and fly further.

“Tree Injection” vs “Crown Spray and Soil Drench”

Tree injection is optimal for the treatment of public space trees since no poison is exposed once the treatment has been applied.

Surface application of chemical poisons pollutes the ecosystem, and makes the immediate area toxic. Pets walk under poisoned trees and accumulate poison on their feet, which subsequently get licked and ingested.

Micro-injecting treatment into London Plane
Micro-injecting a London Plane tree to protect it against polyphagous shot hole borer
ArborJet Tree I.V. system for micro-injection
ArborJet Tree I.V. system for micro-injection of treatment against polyphagous shot hole borer

Do you need help? We can recommend a service provider in your area who knows how to treat PSHB?

For more visit www.PSHB.co.za or click here

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