Common misconceptions about pest control that cause infestations to recur

Many businesses and facility management teams spend recurring budgets on pesticide spraying, yet insects still return within just a few weeks. This situation often stems from reactive treatment practices that focus on visible symptoms while overlooking the biology and behaviour of the pests involved.

Understanding common misconceptions about insect control can help managers adopt a more effective approach, reduce unnecessary costs and maintain a safer operating environment.

Misconception 1: One spraying treatment will eliminate insects completely

One of the most common misconceptions about insect control is that a single pesticide treatment can completely resolve the problem. In practice, a rapid reduction in visible insect activity does not mean that all underlying infestation risks have been eliminated.

If your business is still following a “see insects, then spray” approach, read more about the difference between IPM and traditional insect spraying to understand why a single treatment often addresses only the visible part of the problem.

Many insect species have life cycles consisting of several stages, including eggs, larvae, pupae and adults. Some of these life stages may remain hidden in difficult-to-access locations such as equipment gaps, concealed corners, utility lines, raw material storage areas or high-moisture locations.

For example, with German cockroaches in a food manufacturing facility, the individuals seen in exposed areas may represent only a small proportion of the actual population. Cockroaches commonly harbour in narrow cracks and crevices, behind equipment, inside or around electrical cabinets and in areas that are not cleaned regularly. If treatment targets only visible individuals without addressing harbourage sites and food sources, pest activity may recur within a short period.

In manufacturing environments, cockroach activity often concentrates in several recurring hotspots. You can also review 5 cockroach hotspots in factories and compare them with actual conditions at your facility.

In continuously operating environments such as manufacturing facilities, warehouses and hotels, several factors can continually reintroduce insect risks, including incoming materials, transport activities, frequently opened doors and inadequately managed sanitation areas. In factories and warehouses, potential entry points, receiving areas, incoming materials and storage conditions should usually be among the first areas assessed. Read more about the insect control process in food manufacturing facilities.

Effective insect control should therefore be treated as an ongoing management process rather than a one-off treatment. Businesses need to combine immediate treatment, ongoing risk monitoring and preventive measures to reduce the likelihood of recurrence.

Misconception 2: Using more or stronger pesticides will deliver better results

Another common misconception is that using larger quantities of pesticide will eliminate insects faster and more effectively. However, in professional pest management, the amount of pesticide applied is not the only factor determining treatment effectiveness.

Effective insect control depends on multiple factors, including correct pest identification, appropriate method selection, treatment location, environmental conditions and proper application.

Using an inappropriate amount of pesticide can create a range of unnecessary risks. If pesticides are applied incorrectly, the treatment may create risks for employees, products, equipment or the surrounding environment. Excessive pesticide use may also reduce long-term control effectiveness because some insect populations can adapt to repeated exposure and develop resistance.

In a professional pest management programme, pesticides are only one of several control tools used when necessary. Other measures, including controlling pest entry points, improving sanitation, eliminating food sources, installing monitoring devices and modifying environmental conditions, also play an important role.

For businesses, the objective is not to use the largest amount of pesticide, but to develop a control strategy that matches the target pest and the actual level of risk.

Misconception 3: A site survey is unnecessary — treatment can begin immediately

Many facilities ask service providers for an immediate quotation and pesticide treatment without allocating sufficient time for an on-site inspection. This approach assumes that insect control is essentially the same in every environment and that pesticides are the only solution.

Pest activity develops when three basic survival requirements are available: food, water and harbourage. For example, a food manufacturing facility facing fly activity around a waste-handling area requires a different control strategy from a hotel dealing with cockroaches or bed bugs.

Without a proper survey, technicians may not be able to accurately identify the target pest species, infestation hotspots or entry routes. Applying pesticides without first conducting an inspection is similar to treating an illness without a diagnosis: it increases unnecessary costs while allowing the problem to recur.In practice, the survey should answer three questions: which pest species is present, where it is entering from and which areas currently have the highest level of risk.

A site survey helps businesses move from treating visible symptoms to addressing root causes. It is also a critical step in an IPM-based pest management programme, where monitoring data and risk assessments are used to guide control decisions. If pest activity repeatedly returns in the same area, or treatment frequency continues to increase without producing stable results, this may indicate that the business needs to reassess its entire pest management programme.

Why do pests keep returning after insect treatment?

Pest management goes beyond treating insects; it also involves managing the environmental conditions surrounding a facility. These conditions provide the basic resources pests need to survive.

If pesticide treatment removes part of an insect population while gaps around loading doors remain open, insects from external waste areas or drainage systems can quickly enter the facility again. Similarly, if a warehouse continues to have damp areas and spilled materials, those conditions can support the development of a new pest population. In factories, loading doors, utility penetrations, drainage systems and raw material receiving areas are among the pest entry routes that should be controlled through facility design and structural measures.

A fragmented insect control approach can create a negative cycle. Businesses continue spending on pesticides while some pest populations become increasingly difficult to control, and deteriorating infrastructure continues to provide new routes for pest entry.

Where should effective insect control begin?

An effective insect control programme should begin with an accurate assessment of actual site conditions rather than immediately applying a fixed treatment method.

Businesses need to identify the pest species involved, the level of impact, the affected areas and the environmental factors supporting pest survival. The control strategy can then combine targeted treatment, preventive measures and ongoing monitoring.

In high-requirement environments such as food manufacturing facilities, logistics warehouses, hotels and hospitals, pest management programmes should follow clearly defined procedures supported by monitoring records and periodic reviews. A “periodic review” does not mean automatically spraying pesticides every month. Treatment and inspection frequency should be adjusted according to actual risk levels and monitoring data.

Read more: How often should factories carry out insect control?

How does VFC PestMan implement preventive pest management?

To address the limitations of traditional pesticide spraying, VFC PestMan applies an Integrated Pest Management (IPM) approach that focuses on managing pest risks at their source. This approach helps businesses understand the causes of pest activity, make decisions based on evidence and maintain a more stable control programme over the long term. For programmes with multiple monitoring points, field data can be tracked through the PestMan Dashboard to identify pest hotspots and activity trends over time.

VFC PestMan structures its intervention process around three key stages:

• Monitoring and inspection: Technicians use specialised technologies such as industrial inspection cameras and Termatrac radar detection equipment to investigate concealed structures and detect termite or pest activity without unnecessary destructive inspection.
• Prevention and exclusion: VFC PestMan advises businesses on reducing conditions that support pest activity by sealing structural gaps and entry points, improving drain sanitation, eliminating standing water and strengthening waste management.
• Targeted treatment: Priority is given to mechanical traps, insect light traps and specialised baiting systems where appropriate.

When chemical treatment is required at identified hotspots, VFC PestMan uses registered pest control products with clear product information, including formulations containing 10% bifenthrin where appropriate. Depending on the treatment objective and site conditions, ULV equipment may also be used to apply fine droplets for targeted control of pests such as flies, mosquitoes, ants and cockroaches while limiting unnecessary application to surrounding areas.

In summary, misconceptions such as believing that one spraying treatment is enough, that more pesticide always produces better results or that a site survey is unnecessary can make long-term pest management significantly more difficult.

Pest control should be approached as a form of risk management. Identifying root causes, monitoring activity trends and adjusting control measures accordingly can help businesses reduce the risk of future recurrence.

VFC PestMan is a professional pest management brand backed by more than 50 years of experience, providing business-focused pest control solutions through site surveys, risk assessment, implementation and ongoing monitoring tailored to actual operating conditions.

If your business or property requires professional insect or pest control support, please contact VFC PestMan via hotline (+84) 932 669 883 for advice on a solution suited to your actual needs.