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German cockroach control in restaurants

Many times, German cockroaches in restaurants & commercial kitchens require insecticides as opposed to baiting. Using baits in German cockroach control requires that their is no competing food sources. In restaurants, it is almost impossible to eliminate all competing food sources.

Don’t spray fly spray on German cockroaches

Fly spray is a repellent and will drive the German cockroach deeper into your sub-structures. It will also contaminate any professional pest control work or baiting that has been done.

The number of times we have treated a restaurant well only to come back and find the chef has sprayed fly spray (or similar) everywhere ruining our good work.

It is important to ONLY spray cracks and crevices with a non-repellent insecticide… you can get these through us if you really need to spray something.

How to control German cockoaches in kitchens

Step 1: Clean, clean, clean

When beginning your German roach control program, sanitation is one of the first things to consider. German roaches only need a small amount of food to sustain them.

  • Remove indoor rubbish bins or keep them emptied and clean.
  • Keep rubbish bins outside clean.
  • Make sure food is not left in sink strainers.
  • Keep dishes clean, no residue of food remaining.
  • All kitchen appliances (microwaves, toasters, ovens, refrigerators and stoves) should be maintained in a clean condition so that it is food free and grease free.
  • No food left out.
  • Sweeping or vacuuming of any food particles or crumbs.
  • Clean any crumbs or food particles in your kitchen cabinets.

Step 2: Use non-repellent insecticide

Spray a non-repellent insecticide in small amounts directly into cracks and crevices at points between different elements of construction, between equipment and floors, under and behind appliances, openings leading to voids and hollow spaces in walls, equipment legs and bases, and other areas where roaches hide.

Allow the spray to thoroughly dry before beginning step 2.

Step 3: Use gel baits

Each bait placement should be about the size of a pea. Placements should be under and behind all appliances. Place more bait where you see roach droppings. Apply the gel in all other areas where roaches are, or where you think they might be hiding. Use small pea-sized dabs and apply plenty of them. Suggested areas include: under the counters and under and behind appliances. Keep in mind that roaches like to feed in the dark, so place the roach gel bait in areas where they can feed on it without coming out into the light. The gel bait will be very attractive to the roaches due to its high moisture content. As it dries it will be less attractive but it will continue to work.

Step 4: Use insect pheromone traps

Allow a few days for the roach population to decline and then put out the Insect Pheromone Traps.

Remove the release paper to expose the glue and then fold them into a “tent.” Place them in areas where roaches have been or are likely to be. Use the adhesive strip on the bottom to attach them to walls or under counters. Monitor the traps frequently to help identify areas of heavy roach activity. As the roach population decreases the traps are a good way to discover and pinpoint new roach activity.

Step 5: Maintenance

For maintenance we recommend monthly treatments. At any point during the treatment a non-repellent Aerosol may be used to quickly kill any roaches that are seen. Be careful not to allow the spray to contact any of the bait placements. Remember to read and follow the directions on the product label.

Habits and biology of German cockroaches

  • Females produce one egg capsule every 3-4 weeks. Each capsule contains 25-45 eggs, the largest capsule of all roach species that would infest a building. The female will carry the egg capsule with her until it is ready to hatch, making it less hazardous for the nymph to survive.
  • It also has the shortest period to develop from hatching until sexual maturity. The populations of German cockroaches will build up faster than other species The young (nymphs) will be able to breed in as little as 36 days. A combination of these traits produces what entomologists call a “high reproductive potential.”
  • German cockroach nymphs are smaller than most other cockroaches; thus, they are able to conceal themselves in many places and remain protected.
  • Adult German roaches can live up to one year. These roaches are mostly active at night .
  • If German roaches are seen active during the day, it most likely is due to overcrowding in their hiding places or a shortage of food and water supply. Cracks and crevices are their harbourage areas; they spend about 75% of their time in such harbourages. Nymphs require a crack of about 2mm whereas, adults require an 10mm crack.
  • German roach Infestations are usually are generally found in kitchens and bathrooms. If the population is large enough, they will spill over to other rooms.
  • The German cockroach can move well within a building. They also can travel from a neighbouring apartment or location to another and can pass through small openings like light switch plates.
  • Many times they are brought in with grocery items, grocery bags, cartons, handbags, and luggage.
  • An inspection is important to find all potential harbourages and a determination if it had been brought in with certain items.
  • If insecticides have been used in a building, there is a possibility that the German cockroach simply scattered to another area. These harbourages need to be located and treated. It may not be possible to eliminate all the German cockroaches in a building completely if a consistent supply of cockroaches is carried into the premises via packages or food shipments.

German cockroach identification

Adult German roaches range in size from 12mm- 15mm inch long. They are light to medium brown. They have 2 dark distinctive stripes behind the head. The young German roaches (nymphs) are smaller than adults (as small as 3mm) and are wingless. They have a light stripe on their backs and are darker in color.