Nobody I know likes pesticides or enjoys working with them, but, they have their place.
Honestly, I see glyphosate as a treatment for DSV invasion a lot like I see chemotherapy as a treatment for cancer.
When my mother was diagnosed with cancer, the oncologist told us (and, forgive me, but what he said still reminds me of weed eradication protocols): "our methods are still crude: we can cut it (surgical oncology), burn it (radiation) and poison it (chemotherapy)." Suddenly something as previously unintuitive and horrifying, as having my mother subjected to courses of poisonous chemicals, had become a hopeful option (in a new reality with nothing but compromised options and outcomes) that might prolong or save her life. An option and a pressing decision too.
High Park includes globally rare Black Oak Savannah remnants. The folks who steward that site have a local and international responsibility to preserve the indigenous flora and fauna there = High Park is an excellent example of when glyphosate is an excellent choice (again, in a new reality with nothing but compromised options and outcomes) for conservation.
Restoration Challenges: The Ongoing
By Cara Webster
The City of
Chemical Control Methods of Dog-strangling Vine
Several different methods of herbicide application, herbicide types and dilutions have been tested to develop an effective control for this species. Roundup-Transorb, a glyphosate based herbicide, is being used since its formulation allows quick absorption and is very practical in the field since it can be applied up to an hour before rainfall. A 33% dilution of Roundup-Transorb is applied to plants using a car wash mitt to wick the plants and avoid harm to the surrounding native vegetation. Large monocultural stands are sprayed using a backpack sprayer or hand sprayer. We have found that the label recommended 2% dilution to be used in a sprayer is not very effective at controlling this species but we are continuing to track these results. Treatments have been initiated each year at the beginning of June and continue until early September to cover approximately 20 hectares in
For further information, or if you have any other experiences to share, please contact email@example.com.
Cara Webster is Restoration Specialist with Urban Forestry Services for the City of
- Glyphosate is the commonly recommended effective chemical control for DSV. Glyphosate products and preparations are not all the same. Its effectiveness and safety / toxicity (to users and ecology) depend on what it's mixed with (as well as how and when it is applied). For some insight, check out "Glyphosate - Identification, toxicity, use, water pollution potential, ecological toxicity and regulatory information from the Pesticides Action Network
North America. Here in , you'll see glyphosate-based pesticides running the range of schedule 1-6 (very toxic & restricted use -> low-toxicity homeowner use). It is legal for anyone to go to their local hardware store and buy glyphosate-based pesticides and the City of Toronto’s Controlling Invasives Fact Sheet that recommends glyphosate for DSV control. While the cosmetic use of pesticides in Toronto is illegal, it is LEGAL for homeowners to use on their own property in Toronto to control invasive weeds. To use on other properties, I believe you need to be certified. Ontario
- find all DSV posts on this blog
- for more info -- including databases where you can look up this and other species and their removal protocols -- please see this post:Identifying and Managing Invasive Plants - A Resource List for stewards and gardeners in Toronto and Southern Ontario
- UPDATE: May p 2008: please see "Please comment on proposed Ontario Pesticide Policy"