Can we manage Norway Maple (among other invasive species) out of existence in North America. The short answer is 'yes'.I am glad you posted those articles. They've slipped my news feed.
Similar questions were asked earlier in the thread, but short of taking an axe to Norwegian Maples all across our ravine system, what can feasibly be done? They out-compete native species and their root systems erode the soil, so 'managing' them out of problem areas seems impractical.
And then there is the political aspect of it. We saw how Rosedale reacted when Toronto Parks and Forestry cut down a few trees in the ravine to allow for a pathway.
But it will be expensive, time-consuming, labour-intensive and controversial.
It will also take 2 decades, minimum.
Is it worth trying to do? Yes.
There is no practical way to do it all at once.
The task far exceeds the public and private resources available.
To be truly effective, any plan must cross provincial and international boundaries as well.
We could achieve a great deal w/isolated choices.
But a comprehensive plan would be more effective, sooner, at lower cost.
(but still pricey)
Not a big factor. Definitely has happened in places; but you have to balance that against on-going destruction of farmland, and most of that, either way, is in the 905 locally.I think a good portion of this could be the result of older areas that pioneers once opened-up to farming gradually reverting back to forests, for the reason that it wasn't an optimal farming location to begin with. Large swaths of the Land Between in Ontario was conceded for big farming, cleared, made so-so successful farms and farming communities. It only takes a few years for a field to become forest again, and this can be seen around much of cottage country.
In Toronto, any gains are the result of parkland reverting from mowed grass to forest, with the exception of a couple of small patches in the Rouge.
A couple of things here.Larches/tamaracks are the worst. See people use them in landscaping and it makes little sense. Choose an evergreen coniferous, but one that's alo a deciduous losing its needles. Hm.
Birches and poplars perhaps could be good street trees, just in that the whitish colour of their bark could be a nice twist.
A Tamarack IS a Larch. Larch is the family, Tamarack is the species.
Tamaracks can be lovely, but as species that naturally grow near wetlands, they prefer their feet a bit wet (not under water); they are ill-suited to be street trees.
Birches/Poplars are not great choices for street trees in that they are very short-lived with an average life of only 25 years. Some do last longer, in ideal conditions, but Birch in particular is neither salt nor pollution tolerant.
They would have a very low survival rate close to curbs. They're fine as a backyard choice if you want one. But don't expect it to last 40 years.
Intervention is not only possible, but essential.Yeah...I knew things were becoming serious, didn't realize the Norway Invasion had the ramifications it does to the extent explained.
Author thinks intervention can 'save the day'. Do you? It has real resonance to the Global Warming debate, and whether we're 'past the point of no return'...
The question isn't whether, but how much, where and when?
You can't as a practical matter clean-sweep the forest in 3 years or 5. There are not enough personnel to pull it off, in the private and public sectors. Moreover the aesthetic/optical effect would be awful in the near-term.
The answer is a concerted, multi-year (err decade) plan, that removes based on strategic value, replants in real-time, as much as is practical, and that the preceding done with an effort to educate the public on the value of the effort.
None of this will be cheap.
If you want a finished effort in 40 years......(and that is the time-scale we're talking about)......your looking at Toronto spending an extra 20M per year on removal and replanting (conservatively).
I should add at this juncture that Norway Maple is not the only problem species.
Phragmites is to wetlands what Norway Maples are to forests.
There are many other problem species, though some are being tackled, albeit in ways that are not risk-free. I'll touch on that in a separate post.