Integrated Pest Management for Museums

1. Understanding Pest Risk in Museum Collections

Integrated Pest Management, or IPM, is a structured approach to preventing and controlling pest damage in museums, archives and collection facilities.

It is not simply a method for eliminating insects after an infestation has occurred. An effective IPM programme combines risk assessment, preventive maintenance, housekeeping, exclusion, monitoring, pest identification, quarantine, targeted treatment and documentation into a continuous collection-care process.

The objective is to reduce the conditions that allow pests to enter, survive and reproduce while detecting activity early enough to prevent significant damage.

Collection vulnerability

Pest risk varies considerably according to the materials present in a collection.

Organic materials can provide food or harbourage for different pest species. Particularly vulnerable materials may include:

• wool, fur, feathers and other animal-derived materials;
• leather and parchment;
• paper, board and certain bookbinding materials;
• starch-based adhesives and sizing materials;
• wood and plant-derived objects;
• botanical and natural-history specimens;
• taxidermy collections;
• organic residues, dust and debris associated with stored objects.

Risk should therefore be assessed by considering both the susceptibility of the collection and the conditions surrounding it.

A museum containing extensive textile, natural-history or ethnographic collections, for example, may require a different monitoring strategy from a facility dominated by inorganic archaeological materials.

Pest risk is also a building-management issue

Collections do not exist independently of their environment.

Pests may enter through:

• poorly sealed doors and windows;
• cracks and service penetrations;
• loading and receiving areas;
• vents and drains;
• packaging materials;
• incoming loans or acquisitions;
• food-service areas;
• vegetation and nesting sites close to the building.

For this reason, an IPM programme should consider the entire path from the exterior environment to the collection object.

2. Prevention: Reduce Access, Food and Harbourage

The most effective pest treatment is often the treatment that never becomes necessary.

Preventive measures should therefore form the foundation of museum IPM.

Building exclusion

The building acts as the first protective barrier around the collection.

Doors, windows, wall junctions, service penetrations and other potential entry points should be inspected and maintained so that pest access is reduced as far as practicable.

Particular attention should be given to:

• door seals and thresholds;
• window frames;
• cracks and construction joints;
• pipe and cable penetrations;
• ventilation openings;
• loading docks and receiving areas;
• drains and utility spaces.

Storage cabinets, cases, boxes and other enclosures provide additional layers of protection and should be selected and maintained according to collection risk.

Housekeeping

Dust, hair, dead insects, food residues and accumulated organic debris can provide nutrients or harbourage for collection pests.

Housekeeping within collection areas should therefore be treated as a preservation activity rather than routine cosmetic cleaning.

Cleaning programmes should include areas that are easily overlooked, such as:

• beneath shelving;
• behind storage units;
• corners and wall junctions;
• service voids;
• infrequently accessed storage areas;
• loading and unpacking spaces.

Food and beverages should be separated from collection storage and exhibition areas wherever possible, and spills or waste should be removed promptly.

Moisture and environmental conditions

Moisture can support mould, microorganisms and certain insect pests.

Water leakage, condensation, damp building materials and persistently humid microenvironments should therefore be investigated as part of pest prevention.

Environmental management within an IPM programme should not rely on a single universal temperature or relative-humidity target. Appropriate conditions depend on the materials present, local climate, building capability and the wider collection-care strategy.

The objective is to identify and correct environmental conditions that are contributing to pest activity.

3. Inspection and Quarantine of Incoming Materials

New acquisitions, returning loans, exhibition materials, packaging and other incoming objects can introduce pests into an otherwise well-managed collection.

A defined receiving and quarantine procedure reduces this risk.

A typical workflow may include:

Receive → Unpack → Inspect → Assess Risk → Quarantine if Required → Treat if Required → Release to Collection

Initial inspection

Incoming materials should be examined for evidence such as:

• live or dead insects;
• larvae or eggs;
• cast skins;
• webbing;
• frass;
• bore holes;
• grazing or surface losses;
• damaged packaging;
• mould or unusual organic residues.

Inspection should take place in a designated receiving or examination area where practical, rather than directly within primary collection storage.

Quarantine

Objects with uncertain history, visible pest evidence or elevated risk may require temporary isolation.

Quarantine prevents a localised problem from becoming a collection-wide infestation and provides time for further inspection, monitoring or treatment.

The duration and conditions of quarantine should be determined according to the suspected pest, object material, observed evidence and institutional procedure rather than by applying a single fixed period to every incoming object.

4. Monitoring and Pest Identification

Monitoring provides the evidence required to understand pest activity over time.

Without systematic monitoring, institutions may know that pests are present but have little information about where they originate, whether activity is increasing, or whether control measures are working.

Visual inspection

Regular examination of objects and collection spaces can identify:

• fresh damage;
• larvae and adults;
• frass;
• cast skins;
• webbing;
• exit holes;
• pest activity around windows, doors or drains;
• environmental or housekeeping conditions associated with infestation.

Visual inspection is especially important for vulnerable materials and locations with a history of pest activity.

Trapping

Sticky traps and, where appropriate, species-specific lures can support passive monitoring.

Their primary purpose is detection and trend analysis, not eradication.

Monitoring traps provide evidence. They do not replace exclusion, housekeeping or treatment.

Trap placement should be based on risk rather than an arbitrary uniform spacing rule.

Priority locations may include:

• entrances and loading areas;
• doors and windows;
• wall-floor junctions;
• drains and utility spaces;
• storage areas containing vulnerable materials;
• quarantine areas;
• known historical hotspots.

Each trap should have a unique identification reference so that findings can be linked to a specific location.

Pest identification

Finding an insect is only the beginning of the investigation.

Correct identification helps determine:

• whether the species is capable of damaging collections;
• which materials may be vulnerable;
• where the pest may be breeding;
• its life cycle and movement pattern;
• whether immediate treatment is required.

Records should, where possible, include the pest species or probable identification, life stage, number detected, date, location and associated collection materials.

5. Action Thresholds and Treatment Decisions

Not every insect found inside a museum represents the same level of risk.

An effective IPM programme establishes a rational basis for deciding when observations require intervention.

The decision should consider:

• pest species;
• life stage;
• quantity and frequency;
• location;
• proximity to vulnerable collections;
• evidence of active feeding or reproduction;
• previous activity in the same area;
• significance and sensitivity of the affected material.

A single incidental insect near an entrance may require a different response from larvae of a collection-damaging species discovered within a textile storage cabinet.

Action thresholds should therefore be risk-based and collection-specific.

The purpose of a threshold is not to tolerate damaging infestation. It is to ensure that the response is proportionate to the evidence and that resources are directed toward genuine collection risks.

6. Selecting an Appropriate Treatment Method

Treatment becomes necessary when monitoring and inspection confirm active infestation or when incoming material presents an unacceptable risk to the collection.

No single treatment method is suitable for every object.

Selection should consider four factors.

Pest

The target pest and its life stages influence the conditions required for effective treatment.

Material

Objects may contain combinations of paper, leather, wood, textiles, pigments, coatings, adhesives, metals or synthetic components. Treatment compatibility must therefore be assessed for the complete object rather than for one material in isolation.

Object size and configuration

A single book, a large textile, a storage cabinet and a palletised group of collection materials may require very different treatment configurations.

Required treatment scale

Institutions may need to treat:

• one object;
• a small batch;
• incoming acquisitions;
• an entire storage group;
• large or oversized objects.

Treatment capacity and process control should be matched to the project.

Non-chemical treatment approaches

Depending on the collection and target pest, museum IPM programmes may use methods such as:

• controlled low-temperature treatment;
• anoxic or low-oxygen treatment;
• controlled-atmosphere treatment;
• isolation and containment;
• cleaning and removal of pest residues;
• heat treatment for materials demonstrated to be suitable.

Each method has its own material limitations, process requirements and verification criteria.

Treatment should therefore follow a documented procedure with clearly defined acceptance conditions.

7. Documentation, Responsibilities and Programme Review

IPM becomes significantly more useful when individual observations are converted into long-term evidence.

A pest record may include:

• trap or inspection ID;
• room and location;
• inspection date;
• pest identification;
• quantity observed;
• life stage;
• associated collection or material;
• signs of damage;
• environmental observations;
• action taken;
• treatment performed;
• follow-up findings.

Over time, these records can reveal patterns that isolated observations cannot.

For example, repeated detections near one loading area may indicate a building-exclusion problem. Recurring activity inside a particular storage zone may justify closer inspection of vulnerable collections or storage furniture.

Map and analyse activity

Pest data can be plotted by location and compared over time to identify:

• recurring hotspots;
• seasonal patterns;
• routes of entry;
• areas affected by housekeeping or moisture problems;
• changes following corrective action.

The purpose of monitoring is therefore not merely to collect traps. It is to support better decisions.

Define responsibilities

A successful programme requires clear responsibility.

Depending on the institution, IPM may involve:

• conservators;
• collection managers;
• registrars;
• facility managers;
• housekeeping teams;
• exhibition staff;
• security personnel;
• contractors;
• external pest specialists.

One person or defined team should coordinate the programme so that monitoring, records and corrective actions remain consistent over time.