24/02/2026
MANAGING AND CONTROLLING STORED PRODUCT INSECTS(Moths & Beetles) IN FOOD PRODUCTION AND STORAGE AREAS
Stored Product Insects (SPIs) are among the most persistent pests in food production facilities.
We are not talking about small pantry issues.
We are talking about:
🏭 Production areas with heavy product spillages
🧱 Structural voids and confined spaces
🧹 Years of hidden buildup
⚙️ Conveyor systems and machinery voids
🕳️ False ceilings, wall cavities, expansion joints
🌡️ Warm, undisturbed breeding zones
When infestations persist, the issue is almost never just the insect.
It is the environment.
🔎 Understanding the Enemy
🦋 Stored Product Moths
Adults are what people see.
Larvae are what cause contamination.
Webbing, frass, cast skins ...these are signs of active breeding inside accumulated product residues.
🪲 Stored Product Beetles
Often more hidden than moths.
Some species develop entirely inside food material and tolerate dry conditions better than moth larvae.
This makes deep cleaning even more critical.
🚨 Why Infestations Persist in Production Areas
1️⃣ Hidden Product Accumulation
Spillages under machines, inside frames, behind kick plates, inside hollow conveyor legs, and on shelving supports.
2️⃣ Structural Deficiencies
Cracked floors, wall voids, poorly sealed expansion joints.
3️⃣ Inaccessible Confined Spaces
Equipment not dismantled for years.
4️⃣ Overhead & Elevated Contamination
Dust ledges in milling areas, beams, lighting fixtures, and high-level structural supports.
5️⃣ Air Movement
Moths disperse through airflow systems.
6️⃣ Warmth
Accelerated breeding cycles.
🧠 Integrated Control Strategy
1️⃣ Intensive Inspection & Mapping
Inspection must include:
Pit areas
Under and inside shelving units (especially the base plates / floor flanges / shelf support legs where product accumulates)
Dismantling grain pipes where possible
Dust extractors and ducting
Conveyor return rollers
Ledges in milling and processing areas
False ceilings and void spaces
If you do not inspect these areas, you are not inspecting thoroughly.
2️⃣ Sanitation Is the Primary Control Tool
Chemical treatment without sanitation = temporary suppression.
Critical sanitation actions:
Deep vacuuming of spillages
Cleaning inside hollow frames
Cleaning the bottom plates and legs of shelving units
Removing compacted product under pallets
Cleaning pit areas
Dismantling grain pipes periodically
Cleaning dust extraction systems
Removing overhead buildup on ledges and beams
Remember:
Larvae develop inside product residue.
If the food source remains, the infestation remains.
3️⃣ Good Storage Practices (Client Responsibility)
Stored product control is impossible without proper storage discipline.
Clients should implement:
✔ Separation of raw materials and finished products
✔ FIFO (First In, First Out) stock rotation
✔ Storage on raised pallets or shelving (never directly on the floor)
✔ Adequate spacing from walls for inspection access
✔ Immediate cleanup of spillages
✔ Regular inspection of incoming goods
✔ Properly sealed containers where applicable
Mixing raw materials with finished goods increases cross-infestation risk.
Poor stock management often creates internal breeding reservoirs.
4️⃣ Structural Corrections
Seal:
Cracks
Expansion joints
Gaps around pipes
Unused cable entries
SPI infestations often expose structural weaknesses.
5️⃣ Targeted Chemical Applications (After Sanitation)
After sanitation:
Apply residuals to cracks and crevices only
Use IGRs where appropriate
Apply dusts in dry voids
Use ULV only as a supplementary tool
⚠️ Fogging may be used ...but without source removal will not solve stored product infestations.
Why?
Larvae inside product debris are protected
Eggs are resistant
Adults may disperse deeper into the facility
Fogging reduces flying adults temporarily ... but does not eliminate breeding sources.
⚠️ Professional Integrity: When to Decline Treatment
Sometimes sanitation issues remain unresolved despite repeated recommendations.
In such cases, it may be necessary to:
Document findings clearly
Send written communication to management
Recommend corrective cleaning actions
Postpone or decline scheduled residual or fogging treatments
Why?
Because applying chemicals into a contaminated environment:
Will not produce effective results
Creates a false sense of control
Damages professional credibility
Leads to blame being placed on “ineffective treatment”
Professional pest management requires partnership.
If sanitation is ignored, control efforts will fail ... regardless of product used.
📧 Communication Is Critical
Regular written reminders to clients help protect both parties.
Emails should:
Highlight sanitation findings
Identify specific high-risk zones
Recommend timelines for corrective action
Emphasize food safety implications
Documentation protects your professional integrity and reinforces accountability.
🔁 Follow-Up & Monitoring
Use pheromone traps strategically
Monitor weekly in high-risk zones
Reinspect previously infested areas
Verify sanitation improvements
Breaking the breeding cycle requires persistence and verification.
🎯 Final Reminder
Stored Product Insect control is:
Sanitation-driven
Structurally supported
Chemically assisted
Documentation-backed
It is not spray-dependent.
*In food production environments, pest control is part of the food safety system ... not a separate service.
I’ve shared my approach based on experience, but I know many of you have handled complex facilities as well. What strategies have worked for you in persistent SPI cases? Are there inspection areas or structural issues you’ve found commonly overlooked?
