TREATMENT OPTIONS FOR COMMERCIAL KITCHENS
Cockroach control in a commercial kitchen presents more of a challenge than your average residential kitchen. The ever popular cockroach gel baits may not be the best choice for many sites in a commercial kitchen because baits are slow-acting, have to compete with abundant food, may not perform as well in the heat and moisture, and may restrict your ability to also use residual insecticides nearby. What are your best treatment options for these challenging conditions in a commercial kitchen?
Severe infestation requiring immediate results.
Use a vacuum to first remove many of the cockroaches. Alternatively, use a quick-kill contact spray, followed up with a liquid residual. Using bait alone means a slower control. Check the label for permissible uses in commercial food areas.
Live cockroaches in a deep harborage.
Vacuum, or apply a nonresidual as a directed contact spray directly onto the roaches and into nearby harbourages.
Live cockroaches in a deep harbourage. Use a contact spray (Pyrethrins or other short residual) applied deep into the harbourage with a pressurised aerosol container or other injector system that can get the material deep into voids. Follow up with a residual.
Cracks, crevices, and voids with a history of repeated infestation. Apply an appropriately labelled nonrepellent residual liquid or, if the area is dry, a dust insecticide deep inside the crack or void. The insecticide should be nonrepellent so that any newly arriving cockroaches will enter the treated area. When using a dust, choose one that will remain effective in damp environments. Consider supplementing with an insect growth regulator (IGR) or bait placement.
Infested hot and/or damp areas. In dishwashing areas, cracks around drains, areas around stoves and in similar sites, combine contact sprays or aerosols with a residual product best suited for the conditions of heat and moisture. Microencapsulated insecticides are often best in such locations. Supplement with containerised baits where practical. Dusts are not the best choice but if you use a dust, be sure it is one that remains effective in damp conditions.
Greasy areas or porous surfaces (such as bare concrete). When applying a residual, use an encapsulated product, wettable powder, or other formulation that remains on the surface, leaving a noticeable dry or crystalline deposit.
Always remember to apply baits into harbourage areas which will always be close to food and water. Never spray over any baits with a liquid pesticide as you will contaminate the bait and chase the cockroaches away instead of inviting them to feed on the bait placements.