Johnson Group Cockroaches Control Service

There is no better defense against cockroaches than a tailor-made treatment plan from Johnson Group. Successful cockroach control requires many special skills, including a working knowledge of building construction. An understanding of ant biology and identification can help a homeowner detect problems and understand methods of control. Our Pest Management Professionals will prepare a written treatment programs after the inspection.

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SafePRO® Cockroach Bait Gel - Spot Treatment

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Spot Treatment

Spot treatment (insecticide injection to cracks and crevices) to infestation areas is the most effective way in controlling large population when combined with sanitation and exclusion practices that limit the cockroaches ability to establish or reinvade.


Bait Stations are small plastic units that contain an attractive food base along with an insecticide. The advantage of bait stations is that insecticides can be confined to a small area rather than being dispersed, and they are relatively child resistant. Baits in plastic containers also remain effective for many months.

Gel Bait can very effective for crack and crevice treatments, Apply gel using a bait gun or syringe in small dabs in cracks and crevices where cockroaches will find it. While they are fresh, bait gels are very effective when placed in locations where they will be found by cockroaches. To remain effective, however, the gels need to be reapplied frequently.

Baiting methods are slow acting. Consequently an effective bait program does not give immediate results, but may take 7-14 days or longer. Baits can be quite effective for long-term control of cockroaches unless the cockroaches have other food sources available to them.

SafePRO® Cockroach Bait Gel & Ant Gel


Common types of cockroaches in Hong Kong include Periplaneta Americana (American Cockroach), Periplaneta australiasiae (Australian Cockroach) and Blattella germanica (German Cockroach). Of these three species, the one that has the greatest potential for becoming persistent and troublesome is the German cockroach, which prefers indoor locations.

Cockroaches are medium-sized to large insects in the order Dictyoptera (formerly Orthoptera). They are broad, flattened insects with long antennae and a prominent, shield-shaped section behind the head called a pronotum. Adult cockroaches have membranous wings. Immature cockroaches (nymphs) look like adults, but are smaller and do not have wings.

Cockroaches are tropical and most like warm hiding places with access to water. Reduction of food and water sources and hiding places is essential. Remember, a good sanitation is the best way to prevent invasion.

Vacuum cracks and crevices to remove food and debris. Vacuuming also removes cockroaches, shed skins, and egg capsules. Removing cockroaches reduces their numbers and slows development. Because bits of cuticle and droppings may cause allergies, it is recommended that the vacuum cleaner have a HEPA (high efficiency particulate absorber).

  • Reduce food and water sources
  • Store food in insect-proof containers such as glass jars or resealable plastic containers
  • Eliminate plumbing leaks and correct other sources of free moisture. Increase ventilation where condensation is a problem

All cockroaches go through three stages of life: egg, nymph, and adult. While these insects usually live about 6 to 15 months, the cockroach lifespan varies based on species, moisture, and temperature in each of these phases. Understanding the cockroach life cycle can help you catch infestations before they grow into a serious problem.


The life cycle of a cockroach life begins with an egg. The pests lay cases of 10 to 50 eggs in warm, humid, and secluded spots of homes and businesses. You may find these small, leathery capsules:

Most females create multiple egg cases during their lifetimes, so infestations grow rapidly. For example, one German cockroach can produce over 300 eggs in a year.


Next in the cockroach life cycle is the nymphal stage. Nymphs hatch and undergo several molts, growing a little each time they shed their skins. As they emerge from their old shells, immature pests have soft, white bodies that harden and change color to brown, tan, or gray. They will reach full adult size and coloration with their last molt.


After their final molt, nymphs enter the adult stage and reproduce to start the cycle over again. Since the cockroach lifespan is relatively long and the pests can infest buildings by the thousands, control is crucial. If you think you have an infestation, contact the experts at Johnson Group.

Egg Tube: Under the central back structure (carina). There are 8-9 rising spots

Adult: 2 inches. Reddish brown; large body, edges of pronotum are light colored

Preferred location: Sewers, water meter boxes, storm drains, steam tunnels, animal-rearing facilities

The American cockroach, Periplaneta americana, prefers warm and humid environments, usually with temperatures in excess of 27°C. Under the right conditions, they readily live outdoors and are common pests in zoos and animal-rearing facilities. They are also common in sewers, steam tunnels, and masonry storm drains. Occasionally they forage from sewers and other areas into the ground floor of buildings.

Egg Tube : About 8 sections . The length is twice the size of the width

Adult: 0.5 inch. Light brown, two dark stripes on pronotum

Preferred location: kitchens, bathrooms, food preparation and storage areas

The German cockroach, Blattella germanica, is the most common indoor species, especially in multiple-family dwellings. They prefer food preparation areas, kitchens, and bathrooms because they favor warm (21 to 24°C), humid areas that are close to food and water.

This species reproduces the fastest of the common pest cockroaches: a single female and her offspring can produce over 30,000 individuals in a year, but many succumb to cannibalism and other population pressures. Egg laying occurs more frequently during warm weather. The female carries around a light tan egg case (about 1/4 inch long) until 1 to 2 days before it hatches, when she drops it. Sometimes the egg case hatches while it is still being carried by the female. Each egg case contains about 30 young, and a female may produce a new egg case every few weeks.


Egg Tube: Under the central back structure (carina) There are 2-13 rising spots

Adult: body length about 3 cm; distinct light yellow streaks on the sides at the base of the wings, Periplaneta americana does not have similar yellow markings on the wings

Preferred location: drier areas like cupboards, storerooms

The Australian cockroach, P. australasiae is very similar in appearance to P. americana except for a lateral pale yellow stripe on the each of the forewings which is about a third of the length of the wings and of course the yellow margin around the pronotum. They are also slightly smaller, 27 – 33 mm long. They prefer temperatures which are warm, 30 °C.

The female lays an ootheca about 10 – 11 mm long which contains about 22 – 24 eggs in two rows of 11 or 12 which take about 40 days to hatch, but only 60 percent of this number usually hatch. Once hatched, the nymphs molt 6 – 12 times depending on food, temperature and humidity. Females produce ootheca 20 days after maturation; produces 20 – 30 ootheca at 10 day intervals.

Cockroach Control DIY Products

At the Johnson Group GreenSTORE™, you can acquire easily all effective, environmentally safe and non-toxic products. Free delivery to single location with purchase of HK$500 or above (Not including Discovery Bay and outlying islands, forbidden and remote area).

Please call 24813988 for more details or visit Cockroach Control Products Page.

SafePRO® Cockroach Bait Gel

SafePRO® Cockroach Bait Gel contains a slow-acting insecticide incorporated into a food attractant. Once cockroaches locate and feed on the bait, they will return to their harborage with the bait which also kills other roaches after being expelled in the sputum and feces. Eventually, all the cockroaches in the harborage will die and the infestation will be contained.

PestAerosol™ Insecticide Series

Product Features
  • Effective against flying and crawling pests, including mosquitoes, midges, flies, cockroaches, ants, silverfish, ticks and fleas
  • Fit with homes, offices, restaurants, hotels, warehouses and hospitals

SafePRO® Insect Trap (Sticky Pads)

The relatively big dimensions (43*25 cm) of SafePRO® Insect Trap (Sticky Pads) allow us to cut the trap into different shapes and sizes. The trap detects bugs in anywhere like home, hotels, transit and schools etc. The glue trap attracts both adults and instar nymphs. We can easily check to see if pests have been detected and trapped. It is a cost effective product to provide long-term monitoring program. If a bug shows up, we can then arrange immediate action to eliminate the infestation.

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Flat C5, 26/F, TML Tower,
No.3 Hoi Shing Road, Tsuen Wan, N.T, Hong Kong

Phone: +852 2481 3988

Fax: +852 2425 9251

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