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Originally Posted by borkborkbork
This is a very interesting presentation on the topic:
http://www.jeffriesnurseries.com/eab_workshop17.pdf
They argue that for proper diversity we need 20 different tree genera, and there are only 18 available, and even fewer than that when you think about the challenges of urban trees. |
Quote:
Originally Posted by dmacc
Though, couldn't this be mitigated by people planting a variety of trees on their own property? I assume it isn't enough diversity? I feel like peoples homes have a large variety of different trees on them.
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Interesting read. Diversity on private property definitely helps, and yes we are limited in amount of tree species that will work. However, especially on boulevards where there's lots of room, we should also be planting shrubs, bushes, native grasses and plants around our trees. Having these numerous extra species around our trees helps make the trees stronger, and can accept and fight viruses that don't affect them as they do the trees.
Quote:
Originally Posted by drew
^ the lack of tree trimming is really unfortunate as IIRC, leaving dead branches on the elm trees just encourages DED to spread to an otherwise healthy tree.
It's a viscous cycle.
Delaying the trimming accelerates the spread of DED, which increases the number of trees that need to be cut down, which increases costs, reducing the money available for trimming, which accelerates the spread of DED, repeat.
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Tree/bush trimming is also a significant issue along sidewalks and AT paths here – the AT path that runs along the west side of the red through Fort Garry/Riverview is only half usable. Same with sidewalks on St. Mary's.