Oak Processionary Moth (OPM) Management: Expert Guide for Property Owners
Mar 26
4 min read
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The Hidden Danger in Oak Trees
When we think of caterpillars, most of us imagine harmless creatures that transform into beautiful butterflies. However, not all caterpillars are created equal. The Oak Processionary Moth (OPM) caterpillar poses significant risks to human health, pets, and our cherished native oak trees.
As certified OPM specialists serving Oxfordshire, Buckinghamshire and Berkshire, South Bucks Tree Surgeons provides expert identification, management, and removal services to protect your property and loved ones.
What Makes OPM Caterpillars Dangerous?
OPM caterpillars are covered in microscopic hairs containing toxins significantly more potent than those found in common nettles. These toxic hairs can cause:
Severe allergic skin reactions
Respiratory problems
Eye irritation
Throat discomfort
Potential anaphylaxis in sensitive individuals
What makes OPM particularly concerning is the cumulative effect of exposure—each encounter potentially increases reaction severity. These caterpillars also build distinctive silken nests on oak tree trunks and branches, which remain toxic even when abandoned.
Who Is Most at Risk from OPM?
Tree Care Professionals
Tree surgeons frequently encounter these pests during routine work. South Bucks Tree Surgeons has certified OPM specialists equipped with proper protective equipment and training.
Children
Curious children who enjoy climbing trees or exploring outdoor spaces need education about OPM identification and risks.
Pet Owners
Dogs and other animals can inadvertently contact ground-level nests while exploring wooded areas in many parks and nature reserves.
Property Owners with Oak Trees
Anyone with oak trees on their property, particularly near schools, playgrounds, or high-traffic areas in towns like Thame, Marlow, Chesham, or Gerrards Cross.
Professional OPM Risk Assessment & Management
At South Bucks Tree Surgeons, we implement tailored management strategies based on comprehensive risk assessment:
Low-Risk Scenarios
Examples: Isolated oak trees in remote areas with minimal public access
Management Strategy:
Professional monitoring and documentation
Installation of warning signage
Mandatory reporting to Forestry Commission at opm@forestrycommission.gov.uk
Regular inspections during peak season (May-July)
Medium-Risk Scenarios
Examples: Public parks, golf courses, and areas with multiple oak trees
Management Strategy:
Implementation of professional warning systems
Pathway adjustments to redirect foot traffic
Expert risk assessment by our certified OPM specialists
Targeted biological control methods
High-Risk Scenarios
Examples: Schools, playing fields, residential gardens
Management Strategy:
Immediate professional intervention
Specialist removal services with appropriate PPE
Comprehensive site management plan
Follow-up monitoring and preventative treatments
Environmentally-Friendly OPM Control Methods
Our clients across Buckinghamshire, Oxfordshire and Berkshire, increasingly request eco-friendly management options. When appropriate, we recommend:
Natural Predator Encouragement
Installation of blue tit nesting boxes (a single blue tit family can consume thousands of caterpillars)
Strategic planting of beneficial plants that attract natural predators (Queen Anne's Lace, fennel, dill, coriander)
Creation of habitat for beneficial insects and birds
Professional Monitoring Systems
Installation of specialized pheromone traps
Regular inspections by certified arborists
Population monitoring and documentation
Early detection protocols
Preventative Tree Care
For oak trees, we offer:
Autumn crown reduction services to remove egg clusters before spring hatching
Regular tree health assessments
Professional monitoring during high-risk seasons (April-September)
Customized management plans for properties with multiple oak trees
It is important to note that:
it is not be feasible to prevent OPM from occupying sites, or to entirely eradicate it when present
nor is it economically viable to remove altogether the risks associated with OPM from every site and tree.
The OPM Lifecycle: Timing Your Response
Understanding the OPM lifecycle is crucial for effective management:
September-April: Moths lay eggs on oak branch tips; eggs overwinter
April-May: Eggs hatch as oak trees produce new leaves
May-July: Caterpillars develop through six stages, becoming increasingly hazardous
July-August: Pupation occurs in the silken nests
August-September: Adult moths emerge and the cycle begins again
Our local expertise in Buckinghamshire, Berkshire and Oxfordshire allows us to time interventions precisely according to the weather for maximum effectiveness.
Professional OPM Removal: When Expert Help Is Essential
While complete prevention or eradication of OPM may not be feasible, professional management is crucial for minimizing risks. Signs you need immediate professional assistance include:
Multiple silken nests visible on oak trees
Caterpillars moving in characteristic nose-to-tail processions
Unexplained rashes or respiratory symptoms after garden activities
Proximity of oak trees to children's play areas or schools
Why Choose South Bucks Tree Surgeons for OPM Management?
Certified Specialists: Our team includes certified OPM experts
Local Knowledge: Serving Buckinghamshire, Berkshire and Oxfordshire for nearly 50 years
Comprehensive Service: From identification to complete management
Environmentally Responsible: Emphasis on eco-friendly approaches when possible
Emergency Response: Available for urgent situations
OPM Frequently Asked Questions
Q: How can I identify an OPM caterpillar? A: Look for grey hairs, dark stripe down the back, and distinctive nose-to-tail processing behavior.
Q: What should I do if I find OPM on my property? A: Do not attempt removal yourself. Contact South Bucks Tree Surgeons for professional assessment.
Q: Are all oak trees at risk? A: Yes, though OPM primarily affects trees in urban and suburban areas.
Q: How much does professional OPM management cost? A: Contact us for a free assessment and quote based on your specific situation.
Q: Is OPM treatment covered by home insurance? A: Check your policy details; many providers cover pest management for hazardous species.
Contact us about OPM
Don't risk your health or property—contact South Bucks Tree Surgeons for professional OPM identification, management, and removal.
Places we serve include Amersham, High Wycombe, Beaconsfield, Marlow, Gerrards Cross, Chesham, and all surrounding areas in Buckinghamshire, Berkshire and Oxfordshire.
South Bucks Tree Surgeons Ltd is a fully insured and certified arboricultural company specializing in OPM management and all aspects of professional tree care.
