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Forest Research home > Research themes > Protecting trees > Mammal damage to trees and woodland

Preventing mammal damage to trees and woodland
 

The following tables show

A. A summary of options available for protecting trees from certain species of mammals
B. An assessment of the advantages and disadvantages for each method

Table A: Summary of options for tree protection

BarriersPreferred control
Tree guardsFencingElectric
fencing
Chemical
repellents
ShootingGassing/
poisoning
Trapping/
snaring
Field vole

yes

no

no

?

no

no

no

Bank vole

yes

no

no

no

no

no

no

Grey squirrel

no*

no

no

?

no

yes

yes

Rabbit

yes

yes

no

?

?

yes

?

Hare

yes

yes

no

?

?

no

no

Deer

yes

yes

?

?

yes

no

no

Sheep & goats

?

yes

yes

no

no

no

no

Cattle & ponies

no

yes

yes

no

no

no

no

* Isolated specimen trees can have smooth collars fitted.

Table B: Assessment of protection methods

    MethodAdvantagesDisadvantages
    Tree guards
    • Cost effective for small areas
    • Can protect trees from herbicide damage
    • Can make trees easier to locate
    • Do not present a barrier to public access
    • Do not prevent positive herbivore impacts on ground vegetation
    • Can provide an early boost to growth
    • Do not protect other elements of the woodland ecosystem
    • Are costly for large areas
    • Require regular inspection, maintenance and often eventual removal
    • Are generally not reusable
    • Taller guards can be unstable and cause damage to trees and stem weakness in windy situations
    • Can be unsightly and attract vandalism
    Fencing
    • Cost effective for large areas and high stocking densities
    • Often less visually intrusive than individual tree protection
    • Offers protection for natural regeneration and other woodland vegetation
    • Expensive for small areas
    • Reduces accessibility to woodland users
    • A breach can put whole planted area at risk
    • May prevent beneficial herbivore impacts
    • Some reduction of animal numbers may also be necessary when populations are high
    Electric fencing
    • Low capital cost
    • Reusable
    • Can be effective in protecting short tern regeneration e.g. coppice
    • Generally reliable for domestic stock only
    • Dependent on intensive checking and maintenance
    • Requires reliable power source and earthing; breach or loss of power renders the whole fence-line ineffective
    Chemical repellents
    • Useful emergency measure for immediate and over-winter protection of small areas
    • Expensive for large areas and where repeat applications are necessary
    • Current repellents offer limited duration of protection and do not protect growth occurring after treatment
    Deer - shooting
    • Limits deer damage whilst maintaining positive impacts
    • Recognises deer as a part of forest biodiversity, as a recreational resource, as a tool for habitat management, and as a potential source of income
    • Requires time, experience, planning and long-term commitment to implement
    • Requires co-operation with neighbours if used in small woodlands
    • Public safety considerations may limit potential to cull
    Grey squirrels -poisoning
    • The most effective method currently available, particularly in terms of labour requirement
    • Use of a hazardous mammalian toxin in the environment
    Grey squirrels -multi-capture traps
    • Easy to site and set; may be used even where red squirrels are resident
    • High capital cost and labour requirement
    Rabbits - gassing
    • The most effective method of rabbit control
    • Requires properly trained and equipped personnel
    Rabbits - cage traps
    • Non-target species can be released unharmed
    • Does not require access to burrow systems
    • Useful for removal of rabbits from within fenced areas
    • Unsuitable for removing substantial numbers of rabbits
    Rabbits - box traps
    • Can catch substantial numbers of rabbits
    • Useful for removal of rabbits from within fenced areas and for maintaining good relations with neighbours
      • High capital cost
           

      What's of interest
      Further reading
      Several Forestry Commission publications covering mammal management in more detail. Some are available for downloading.
      Related pages


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