Prudent use of pesticides while patrolling the perimeter – PCT


For many pest companies, the approach to outdoor pest control focuses on the building foundation and involves the routine application of water-based formulations. Such treatments target sites where pests must crawl to enter a building and are exposed to environmental factors that reduce the effectiveness of an insecticide.

Perimeter treatments of building envelopes play a role in controlling many species of pests including ants, centipedes, crickets and European earwigs, but should not be the only treatments used for outdoor pest control. Overall, less insecticide can be applied in a more effective manner when targeting active and likely pest harbours.

Every field service situation is different and will have different types of vegetation, landscape beds and potential shelters. Some buildings have more of these than others and therefore may require more service time. The more vegetation, mulch, leaf litter and/or objects on the ground, the greater the potential for increased pest activity. The goal is not to eliminate all pests outside, but to reduce the likelihood of pests getting inside and being seen by the customer.

ANTS DRIVE SERVICE CALLS. Ants are by far the most widespread and stubborn external pest, constantly looking for new resources. Most indoor sightings come from colonies located outside, and in some cases sub-colonies can be established inside. The most effective way to limit indoor ant invasions is to find and treat outdoor colonies. Efforts should not be concentrated just near the foundation, but should extend away from the building to the property lines as colonies unaffected by the foundation will move to infested treated areas.

It’s wise to carry a sprayer when looking for ants because if a colony is uncovered, the ants can quickly relocate within minutes. Soaking each colony as soon as it is discovered is both efficient and effective, allowing for minimal insecticide application. Other pests found by turning items over, searching through stacked items, or searching landscape beds for ants can also be treated as soon as they are discovered.

In addition to locating and treating active pest foci on the property, preventing indoor pest entry should target potential pest entry points. Insecticides applied directly to cracks and holes where pests can reside or enter last longer than those applied to surfaces around such openings. A variety of formulations can be used to treat internal and external cracks and punctures, including dusts, aerosols, baits, foams and water-based products. Which wording is used depends on the situation, e.g. B. the depth of space behind the crack or the type of pest attacked.

Wintering pests such as ladybugs or grape flies benefit from the application of a residual insecticide applied to external cracks combined with spot applications on the surfaces surrounding such openings where these pests land before crawling inside. For ants, application of a non-repellent insecticide into the cracks will contact and kill the ants as food inside. Peridomestic roaches are best treated with baits placed in openings and soffits.

Initially it may take some time to treat external cracks. Involving the customer to seal cracks and openings, or selling a turn-off service to do this for them, reduces the need for future re-treatments, saving time and treatments on future service visits.

Spider management is another aspect of perimeter service. A common approach is to sweep the webbing with a cobweb brush at each service, but this step alone does little to reduce spider numbers. Spot treatments applied to corners under soffits and eaves and other places where web-forming spiders arrange their webs (1) come in contact with spiders and their egg sacs, and (2) leave residue on surfaces that future spiders use when building new ones networks can come into contact.

PERIMETER TREATMENT OF THE FOUNDATION. Finally, perimeter treatments of foundations should focus on the situation at hand, rather than routine use by all label-approved field services. For example, a home with high ant pressure, such as B. Argentine ants in summer in California, benefit from full tag-driven perimeter treatment during these months. At other times of the year, when ants are less common, targeted treatments where ant tracks are seen are effective, saving time and materials. If a client has a problem with peridomestic roaches, perimeter treatment will yield fewer results than targeted treatment with bait and other residual formulations.

Pest professionals can and should be cautious in their application decisions with field services. You should keep in mind the target pests affecting the customer and then make a choice of treatments and formulations that fit the situation, targeting active havens and entry points for pests to provide a more efficient and effective overall service.


Barricor SP features and benefits

The innovative insecticide offers a number of technician-friendly features.

Barricor SP offers a valuable new option for high-frequency, gentle maintenance services for both residential and commercial customers. The product features an innovative Solid Particle (SP) formulation that provides excellent performance on complex surfaces (e.g. mulch, concrete, gravel, etc.) by keeping the active ingredient more bioavailable to over 40 common pests.

Barricor SP is also technician friendly, requires no personal protective equipment and is also profitable for your business as it is available at a similar cost per household as economy pyrethroids. Other features and benefits include:

• User friendliness

• Wide label

• Effective for complex services

• No signal word

• Proven active ingredient

• Cost efficient

• Low dose rate

The high-performing, low-dose-rate formulation product is available in a 32-ounce precision pour-out package. To learn more about Barricor SP, contact your local Bayer representative or visit

*Always follow state and company policies regarding PPE.


Perimeter Checklist

The goal of perimeter pest control is simple. Stop pests outside before they enter a customer’s home or business.

If there are no pests inside, treating only to the extent is common practice for maintenance work on residential accounts throughout the year. This strategy is largely possible because of advances in pesticide technology, where Bayer has led the way with new products and formulations that work better and last longer in the home. The pure perimeter service has advantages for both PMPs and customers:

• Convenient scheduling – the customer does not have to be at home

• Less time spent on account maintenance

• No use of pesticides inside, reducing the likelihood of exposure

• Control outdoor pests at source or nest

Non-chemical control methods add value and can generate additional revenue. These methods include:

• Remove alternative food sources – trash cans with tight-fitting lids

• Seal external joints

• Make sure doors and windows are properly shielded

• Basement/crawl space vents are working properly

• Take firewood away from home

• Remove clutter and shelter from foundation

• Remove excess mulch around foundation, gravel is recommended

• Cut bushes and trees away from the structure

• Make sure the ventilation slots are shielded

• Reduce excess moisture

• Make sure the gutters are clean and functional

• Remove dead trees, stumps and landscaping wood

• Make lighting recommendations

• Remove cobwebs

(Source: Bayer Perimeter Pest Guide)


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