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Oriental Cockroach

Scientific name: Blatta orientalis


The Oriental cockroach is a medium-sized pest measuring about  20–25 mm in length. It is dark brown to black and colour and is sometimes referred to as “water bug” because of its preference to live in damp, dark, and cool environments. This species tends to move slower than others and can be seen living in sewers, drains, decaying organic matter, and other damp locations. It is more prevalent in southern parts of Australia because of its preference for cooler environmental conditions.

Descriptions

Egg. The oriental cockroach egg capsule or ootheca is 8–10 mm in length and can contain up to 16 eggs. The female cockroach carries the ootheca for 12–30 hours before dropping it onto a surface near a food supply. The incubation period takes about 60 days on average under room temperature conditions.

Nymph. Nymphal development takes about 6–18 months, and moult 7–10 times. Like the adults, nymphs are sluggish and can be found outdoors in damp and shady areas near the ground. 

Adult. Adult oriental cockroaches appear dark-brown to black with a glossy body. They are around 20–25 mm in length. Males have wings covering most but not all of their abdomen, while females have very short functionless wings. Both males and females cannot fly. Furthermore, males have styli between their cerci while females do not. 

Behaviour and Life Cycle

Oriental cockroaches are primarily an outdoor species. They can be found in sewers, under debris, decaying organic matter, and stones. They can also live in damp subfloors and drainage systems. Although they naturally live outdoors, they have a tendency to invade homes during summer. They enter homes through door gaps, drain pipes, and other crawl spaces in search for higher humidity. They can be found in basements, under sinks, or any cool areas inside a household. They feed on garbage, sewage, and decaying matter. They eat almost anything but prefer starchy food.

Unlike other species, the oriental cockroach is seasonal, with adults appearing in spring and summer. The lifespan of adult oriental cockroaches is 3–6 months. Females can produce about 200 offspring during this time. 

Oriental Cockroach Treatment

Client Preparation and Gaining Access
  • Introduce themselves to the client and explain the work order.
  • Tell the client that it is necessary to inspect warm and humid areas near food and water sources such as kitchens, bathrooms, pantries, cracks and crevices, cupboards, behind refrigerators and stoves, dishwashers, washing machines etc.  
  • Inform the client about the treatment details, the products to be used, and where they will be used.
  • Ask for any health issues e.g. asthma
  • Explain treatment preparations e.g. all windows need to be closed, the pet’s water bowl should be turned over, clothes on the line should be removed, etc. 
  • Explain the difference between German cockroaches and “large” cockroaches
  • Explain the warranty
  • Confirm the approval of the client to proceed.
Pest Controller Equipment for Inspection
  • A powerful flashlight
  • Notepad to record findings
  • Digital camera or phone to take pictures of infestation sites
Risk Assessment

Perform a site risk assessment and identify potential hazards or risks within the property.

  • Exclude occupants, children, and pets for the duration of the treatments 
  • Secure pets and make sure they can not escape
  • Remove or turn over any pet food or water containers
  • Remove clothes on lines
  • Cover fish ponds
  • Keep a spill kit on site
  • Wear the necessary PPE
Inspection

Australian cockroaches live outdoors and prefer to hang out in gardens, mulch beds, and wooded areas, where they feed on decaying organic matter. They find their way indoors when living conditions become too harsh. Because of their behaviour, both outdoor and indoor premises should be inspected. 

Outdoors:

  • Focus on entry points: windows, doors, crawl spaces, utility openings, and foundation cracks.
  • Inspect the debris in the yard such as leaf litter, woodpiles, rocks, logs, stones, under the bark of trees, and pipe openings.

Indoors:

  • Examine kitchens, bathrooms, utility rooms and laundry rooms.
  • Look inside cabinets, drawers, pantries, under the sink, and behind the toilet.

Look for evidence of Australian cockroach activity:

  • Look for dead or live roaches. This is where the knowledge of identifying the Australian cockroach from other cockroach species will come in handy. 
  • Faeces (small dark droppings that look like coffee grounds)

Document findings as you conduct the inspection. Take note and/or photos of any signs of cockroach activity, including locations and the severity of the infestation. 

Non-chemical Control

Sanitation

  • Get rid of clutter because it created harborage that provides hiding spots. 
  • Get rid of available food and water sources that can compete with bait applications. 
  • Immediately clean food and beverage spills. 
  • Vacuum regularly and properly dispose of the debris in a sealed plastic bag. 

Physical/Mechanical Control

  • Fix plumbing leaks, gutters, and other sources of water or moisture.
  • Place trashcans away from doorways. Additionally, use garbage bins with tight-fitting lids and plastic liners and religiously empty them at the end of the day so food waste would not be left overnight. 
  • Clean drains.
  • Seal up all cracks, crevices, and holes on walls and floors with caulk to get rid of entry points. 
  • Installing door sweeps to block gaps under doors. 
Chemical Control

Outdoor Treatment

  • Do a perimeter treatment using Biflex Aquamax. This will serve as an outdoor barrier protection that will help prevent roaches from entering the house.
    • Read the label to determine the correct application rate and PPE to be used. 
    • Spray across door thresholds, in the corners around the doors, window sills and openings around the windows where roaches can crawl into, eaves of the house and its corners, under decks and where the deck meets the house, under the bushes, and the foundation of the house.
  • Insecticidal dust is an effective way to treat wall cavities, roof voids, and other inaccessible areas. One advantage of using dust is that it provides long-lasting residual control when applied in dry conditions.
    • Dust weep holes with Permethrin dust using a handheld puffer
  • You must apply Dust to the exterior wall void
  • You must only use a product described as an Approved Dust in the Pesticide List
  • Ensure Dust does not come into contact with caged birds or fish.
  • For brick veneer dwellings, use a Dusting Machine to distribute Dust at the Label Rate into the wall cavities via the weep holes. 
  • For weatherboard homes, use a Dusting Machine to distribute Dust at the Label Rate into the wall cavities by placing the nozzle under the lowest board.
  • Where the construction of the building or any other condition prevents the safe application of dust into the wall cavities you must not apply dust in an unsafe manner and you must notify us of the reason[s] the application would have been unsafe and any alternative treatment carried out when You Complete the Job.
  • Replace the Dusting Machine into a secure part of Your Vehicle.
  • Remove the electrical extension cord and either turn off the power point or replace the power cord for the appliance that was previously inserted into the power point.
  • Double check to ensure that any electrical appliance, in particular any fridge or freezer has not had its power supply interrupted.

Indoor Treatment

Dusting cracks, crevices, and behind appliances

  • Read the product label and follow directions of use, application rate, and the required PPE. 
  • Apply permethrin dust with a power blower into cracks and crevices
  • Apply permethrin dust with a handheld puffer behind the fridge, dishwasher, and other appliances. 
  • Be cautious when treating near electrical outlets and switches

Dusting the roof void

  • Only apply Dust listed in the Pesticide List as an Approved Dust
  • If you remove an electrical appliance lead to connect the dusting machine, you must reconnect the appliance immediately after You have finished applying dust to the roof void.
  • Use a ladder to remove the access point (manhole) cover.
  • Use a torch to inspect the roof void before applying Dust to the roof void.
  • Using the Dusting Machine’s dust/air mixture control and the extension wands you must apply an even distribution of dust to the entire roof void. 
  • If it is not possible to apply an even distribution of Dust from the manhole You must enter the roof void to complete the operation.
  • If You enter the roof void you must not allow any component of the roof to bear of any significant portion of your body weight that is not either:
    • a part of a truss; or
    • substantial roof support (obviously capable of supporting the weight of your body) .
  • If there is no access to the roof void or it is unsafe to access the roof void you must notify us when you Complete the Job.
  • If the access to the roof void is obstructed you must within 24 hours and you must make reasonable efforts to return to Apply Dust to the roof void.
  • Where access is obstructed You must not Complete the Job until either:
    • Dust has been applied to the roof void; or 
    • You have received written authorisation from us to Complete the Job.

Sprays

  • Read the product label carefully and follow all the directions for mixing the spray and make sure to follow the correct application rate. 
  • Wear the required PPE based on the label and/or SDS
  • Locate cracks, crevices, and where the roaches travel along.
  • Only use a 4001 spray tip unless You are injecting into a void.
  • Spray Seclira WSG on floors and walls, Biflex AquaMax, or chemicals approved as an internal perimeter spray in the Pesticide List
  • Apply a fine spray to all accessible parts of the entire perimeter to all the rooms of the dwelling.
  • Apply Chandrite Extra Strength, or other approved aerosols in the Pesticide List behind the washing machine, dishwasher, etc. 

 Gel baits

  • Apply the Seclira cockroach gel near harbourages or where cockroach activity was observed.

Where there is a light infestation

  • Cockroaches are only observed at night, apply 4-6 bait points per 10 m².

Where there is a moderation infestation 

  • Apply 7-11 bait points per 10 m².

Where there is a heavy infestation

  • Cockroaches are seen during the day and are readily seen when cabinets, cupboards, or pantries are opened, apply 12–24 bait points per 10 m². 

Reapplication of the gel bait is done when it is consumed or is no longer palatable to cockroaches. It should not be applied more than once a month unless it is consumed. 

  • Possible placements include baseboards, under sinks, cupboards, cabinets, etc. 
  • Check bait placements to clean or replenish as needed.
  • Do not apply where food or feed is prepared.
  • Apply in areas where is it not easily accessible to children or pets.
  • Do not apply in areas that were recently treated with insecticide.
Restore the Site

Once you are done treating the area, you must restore it to its original condition. Anything that was moved due to risk assessment, or to gain access to a harbourage should be placed back to where it was e.g. pet’s water bowls should be replaced, replace toaster or microwave if it was moved, any electrical appliances that were removed to use the dusting machine should immediately be reconnected, etc. 

Completing documents, Re-entry time, and Post Treatment Expectation

After the treatment, talk to the client and discuss the terms and conditions and the invoice incompletion. You must ensure to discuss when the occupants can re-enter the treated rooms and ventilate the house to allow fresh air to circulate and remove any lingering odour or fumes from the chemicals. 

You must discuss what to expect after the treatment. For example,  you must explain that the occupants might notice that there is an increase in pest activity after the treatment, which is normal because the pests were flushed out from hiding spots; the cockroach activity should decrease within the first 2 weeks, then over the following weeks. You should also explain the mode of action of the products you used to assure the customer that the treatment will work. 

Clean & tidy up

Clean all equipment used during the treatment immediately after use, as dried pesticides are harder to clean. Clean the equipment away from water supplies and children and animals, also check the pesticide label to know how to properly dispose of and store them. Wash and clean your PPE immediately after use. Return all items such as sprayers, warning signs, etc. to the vehicle, and correctly store PPE. Be sure to wash any parts of the body that may have been exposed to the pesticides with soap and water.

Treatment Polls

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