Large Alder Sawfly (Cimbex connatus).
The Wilden Marsh Blog
A nature conservation blog about the fauna and flora of Wilden Marsh Nature Reserve and Site of Special Scientific Interest in the Lower Stour Valley, Worcestershire, England.
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I have a real problem with sawflies on my roses!! Can’t imagine how much damage they could do to a tree 🙁
Perhaps the way to look at it, Sarah, is that all animals are here to consume the world’s resources; it’s the circle of life.
If I cut a willow tree to ground level this year, next year it will be a 2 metre high bush. Even though a tree or bush might be devastated or killed one year, it will have produced many seeds to take advantage of the light and space made when a tree falls. As a new tree grows, the fallen tree is returning to the soil to nourish its offspring, and provides food and shelter for a wide range of grubs, beetles, insects, birds, larger animals and plants. We all benefit from that fallen tree.
The sawfly is doing what we are all hard-wired to do: survive long enough to pass on our genes.