A bumper crop of mast that has helped bolster grey squirrel populations could have a serious knock-on impact on young and broadleaved trees, according to concerned conservationists. “With an abundant supply of seeds and nuts, we can expect better grey squirrel survival rates through winter, and more resources for breeding, so inevitably populations will increase,” said Charles Dutton, vice chairman of the European Squirrel Initiative.
Currently, evidence suggests 2025 was a ‘mast year’: when certain tree species – including oaks, beeches, hazels and chestnuts – produce a much larger crop of nuts, seeds and fruit than normal. “The upshot of this is that when grey squirrels increase in number, so we see more damage to trees – particularly by bark stripping,” explained Dutton.
Young, broadleaved trees are particularly vulnerable, especially…
