The ash sawfly's green larvae are capable of devouring every leaf, leaving a skeletonised canopy.
all but eliminated elm trees in Ireland, there are similar fears about what may happen to the ash species.which spreads through spores from infected trees, landing on leaves and travelling into the trunk.Dr Archie Murchie is an entomologist with the agri-food and biosciences institute , a body of the Department of Agriculture, Environment and Rural Affairs that plays a key role in protecting Northern Ireland's trees and plants.
"We're not seeing the trees die within four or five years, but after 10 years it could be a different story," he said.Dr Roy Anderson, an insect specialist at the Ulster Museum, said 2023 has been a particularly severe year for ash sawfly defoliation. "The problem is, as with many invasive species, parasitic predators didn't arrive with it and the sawfly population has lost natural control."He said a review could be carried out to assess the possibility of introducing a predator like those found elsewhere.
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