Counting the Cost of Squirrel Damage in a Small Wood
Trees are at their most vulnerable to squirrel attack between the ages of 10 – 40 years. This case study breaks down the cost of control.
Bron Haul Farm, Abergele, Conwy
16ha woodland at 20 yrs, 4ha at 4 yrs
Ruth Pybus and David Brown
Primary Management Plan objective: High quality hardwood timber
Set up costs
The woodland was planted under the Woodland Grant Scheme and Glastir Woodland Creation and managed under Better Woodlands for Wales (BWW) and Glastir. The work was done by the owners, volunteers and some paid help.
Total planting and establishment costs were £50,000
By 2040 woodland is expected to produce 3m3 /ha/yr sawlogs @£100/tonne standing = £4,800 pa increasing by 2060 to…
4m3/ha/yr sawlogs @£100/tonne standing=£6,400 pa
The 16ha of broadleaf trees which were planted 20 years ago have attracted the unwelcome attention of grey squirrels despite a vigorous grey squirrel control policy which began when trees were just 10 years old. In the year before control was introduced, grey squirrels damaged trees by bark stripping and damaging shoots in the following proportions:
30% of the birch
20% of the beech
In one year, within just one week at the end of the trapping period when one squirrel had been missed it damaged
5% of the oak
Trees are at their most vulnerable to squirrel attack between the ages of 10 – 40 years. David and Ruth have been using live traps since the trees were 10 years old, twice and sometimes three times a year catching on average 60-80 squirrels.
Costs of trapping
Trap sites are chosen to give good coverage of the woodland, focussing on veteran trees favoured for dreys and the ingress points of wildlife corridors. Consideration is also given to a logical trap route walk around the wood.
Platforms are built to set multicatch traps off the ground (away from badgers) x 20 (1 per ha).
£50 each = £1000
Traps for each platform
£30 each = £600
Traps baited with peanuts = £40 p/annum
Annual hours spent trapping: 60 per annum
Minimum wage equivalent = £470 p/annum
£15 per hour wage equivalent = £900 p/annum
The traps are liberally baited twice without being set. Each visit takes 1.5 hours. They are then baited again to start the trapping session. It takes about 2 hours to visit all traps, dispatch squirrels and rebait. The traps are then visited at least daily until no more squirrels are caught. Typically, trapping will go on for a week.
Ruth and David have not had to replace damaged trees. Their vigilance has resulted in healthy trees which are free of damage and safer. They hope the removal of greys helps native birds and mammals.
In the long term they want the woodland to be financially viable should there be no grants available to private woodland owners.
They advocate regional control groups with a coordinated grey squirrel eradication programme funded by the public purse.
In 2017 Bron Haul was visited by a pine marten. The owners have set a video camera to see if it returns and whether there is any noticeable impact in their woods.