Dog Strangling Vine – Results From 2006

In the March issue of “Crop Talk” an overview of Dog Stangling Vine was presented. We don’t have a clear understanding of how to control this highly invasive species by biological, cultural or chemical control methods. 

A field trial was initiated in the Durham Region this summer to work towards developing suitable control options . The objective of this preliminary trial was to determine the sensitivity of Dog Stangling Vine to a number of herbicides. Unfortunately, there was not a single herbicide tested that provided control. However, there were a few treatments that inhibited the production of seed pods, which may be beneficial for long term management. 

The following images illustrate the response of Dog Strangling Vine to selected herbicide treatments. Herbicides were applied at the early-bud to flowering stage (near the end of June). It has been speculated that this is the most effective stage for control, particularly with non-selective herbicides such as glyphosate. 

Figure 1. An untreated Dog strangling vine plant

Figure 2. Leaf and pod injury following an application of amitrole. Note the reduction in pod size, with no seed within the “reddened” pod.

Figure 3. Pod distortion following an application of dicamba/2,4-D

Figure 4. Dog strangling vine following an application of glyphosate. Note the leaf defoliation and yellowing along with the complete lack of seed pods.

Figure 5. Dog strangling vine following an application of Arsenal (the only herbicide that lists this weed on its label). Note the leaf discoloration and the lack of any seed pods.

It is clear that more information on control strategies needs to be obtained. Therefore research trials will continue in 2007. We have already received feedback on different control methods that landowners have tried in the past. We do appreciate this information. If you have implemented any management strategies that have been successful, please share it with us.

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