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Protecting businesses and homes in South Africa from Pests for 50 Years
Pests are a public health and business risk. They can cause damage to buildings, fittings, furnishings and food products, transmit disease, cause unsightly marks and smells and affect customers in several ways, including illnesses, irritating bites, bad feeling and loss of custom.
Pest infestations impart costs to businesses from:
Businesses providing products and services to the public are expected to give pest control a high priority. Hotels and restaurants have a responsibility for protecting public health by preventing contamination of food and transmission of pest-borne diseases inside their premises.
Food safety legislation (in the EU Regulation (EC) 852/2004) mandates that food handling businesses exclude pests and prevent food contamination by taking effective measures.
Rats and mice are attracted by food supplies and do not venture far from their shelter or nesting sites, so in a large facility will nest close to accessible food stores.
Rats and mice are capable of a rapid increase in population given an abundant food supply, due to the number of litters they are capable of producing and the time to maturity, shelter from predators and benign environmental conditions inside a building.
The hazards from rats and mice include:
Rats and mice leave distinctive signs that show which pest is present:
Control of rodents involves the elimination of harbourage in and around buildings and preventing access to food, water and shelter. There may be many points of entry to a building, such as cracks, vents, pipes, cabling, drains, doorways, windows, screens, where measures can be taken to prevent access.
Any rodents present must be controlled using traps or poison according to acceptable practices and legislation, including food law, health and safety, environmental and wildlife laws.
Rodenticides used must be registered products, placed in secure bait stations and restricted to areas where food is not handled. If stored on site they must also be stored in suitable conditions that prevent contamination from the poison in food products and the environment.
Expertise is needed to determine the type of bait used, where it should be placed and the frequency, the monitoring regime and the documentation, which is best done using an outside contractor. If done in-house, staff will need to be certified to handle the chemicals and carry out the rodent control activities.
There are specific requirements for documentation in food standards and legislation, such as maintaining maps of all bait stations, records of sightings, records of training of staff, and the monitoring regime, therefore it is important to have trained personnel responsible for this.
The Campaign for Responsible Rodenticide Use (CRRU) promotes the safe use of rodenticides to ensure they are used correctly and in ways that minimise exposure of wildlife and other non target animals. It promotes safe and responsible use through a seven-point Code of Practice:
Rentokil’s technicians are trained in the safest and most effective use of second generation anticoagulant rodenticides (SGARs) that meet the strict requirements of the CRRU stewardship scheme. In the UK our technicians are British Pest Control Association (BPCA) certified.
As a professional organisation we ensure our front line staff are fully aware of the risks professional products can pose to wildlife and apply this knowledge to reduce any risks to non-target species.
Cockroaches are the most common type of crawling insect that infests food handling businesses. They cause particular problems because of their size, giving them the ability to hide in small places, their varied diet, rapid reproduction and the diseases they can carry.
Cockroaches are primarily nocturnal, sheltering in the daytime and coming out at night to find food and other sites for shelter. They shelter in dark places such as cracks, crevices, drains, sewers, inside equipment and furnishings and hidden spaces that provide the right temperature and humidity. These places are also hard to reach using normal cleaning and sanitation methods.
Good sanitation practices prevent infestations and pick up the presence of cockroaches:
The German cockroach is the most widespread and reproduces more rapidly than the other common cockroaches. After mating, the female produces an egg case containing about 30 eggs and carries it at the tip of its abdomen for about 30 days while the juveniles mature, until 1–2 days before hatching. The juveniles hatch looking like small adults, but without fully developed wings.
The other species deposit the ootheca in a suitable location to incubate for several weeks or months. Young immature cockroaches undergo gradual metamorphosis. They resemble adults and have similar feeding habits, but they do not have fully developed wings and are not reproductively active. Immediately after molting, cockroaches are white, but their outer covering darkens as it hardens, usually within hours.
A number of treatments are available for control of cockroaches, including sprays, aerosols, dusts and bait. There are stricter regulations for control near food handling and storage areas, to prevent contamination of foods with poisons.
The insecticides used must be permitted for use by the relevant local or national authority and will require competent, trained personnel to apply them.
Rentokil also has chemical-free control methods suitable for sensitive business environments and Insect Monitor Units to detect signs of activity.
Bed bugs are one of the most troublesome recurring pests for hoteliers. They are impossible to prevent because they are brought in by guests in luggage and clothing. They are also brought in via other means, including employees, external contractors, laundry services, neighbouring properties, second hand or antique furniture and electronic devices.
Once in travellers’ luggage and clothing bed bugs have no problem surviving long journeys. At cool temperatures they can survive several months without feeding so can easily move between hotels across the world or survive in a furniture store.
When in a hotel they can also be carried around in bedding and furniture and crawl from room to room through holes in walls, such as for electrical wiring or pipes. Adjacent rooms on the same floor and on floors above and below can then quickly become infested.
This means it is essential to have an integrated pest management program to minimise the chance of them coming onto your property, monitor their presence to discover their presence as soon as possible and eradicate the pest before it has a chance to spread and breed.
Bed bugs have been associated with humans for thousands of years and have been recorded in texts since at least ancient Greece. They belong to the Cimicidae family of small parasitic insects, which consists of around 90 species of small oval-shaped and flat wingless insects that all feed on warm-blooded animals.
Each species tends to prefer particular host animals to feed on, some more specific than others. This is thought to be related to their ability to digest blood of different species and the size of the red blood cells of the host compared to the insect’s food canal.
The common bed bug, Cimex lectularius, prefers to feed on human blood but can also feed on birds, bats, rabbits and mice. It is thought to have evolved from bat bugs, first becoming a parasite of ancient humans when they lived in caves inhabited by bats. One tropical bed bug is also a human parasite: C. hemipterus (also called C. rotundatus).
Several other species that feed on bats, wild birds and poultry, are known to infest human habitation and opportunistically feed on humans, especially when their normal host has left or has been disturbed. The European swallow bug is known to infest houses, crawling from swallow nests in winter time after the birds have left the nests to migrate.
The common bed bug occurs across temperate zones, wherever there are people. They are adapted to thrive at the same temperature and humidity levels that are comfortable for their human hosts.
The tropical bed bugs are distributed across tropical and subtropical regions and on the American continent are seldom found north of Mexico and Puerto Rico. Little is known about the limits of their distribution elsewhere.
Bed bugs were a widespread problem until DDT was used as an insecticide starting during World War II to control typhus in Europe, and malaria and dengue fever in tropical areas. The near eradication of bed bugs was a side effect of the use of DDT to control these disease vectors. Following bans on DDT around the world and with the increase in international travel, the bed bug has made a strong come back, especially in hotels, care homes, hostels, and dormitories.
Conditions under which the common bed bug thrives include:
Bed bugs are flattened, brown, wingless insects ranging in size from around 5mm as adults down to 1mm as newly hatched juveniles. The first stage juveniles are pale brown and all stages change colour after a blood meal to purplish red. The feeding also changes their abdomen to be torpedo shaped. The eggs are whitish and less than 1mm long.
Bed bugs aggregate in colonies at all life stages, attracted to each other by ‘aggregation pheromones’. These were only identified in 2014 by scientists at Simon Fraser University in the US who analysed bed bug faeces after eliminating other possible sources of pheromones. They found that bed bugs are attracted to shelters by a blend of five volatile chemicals in the faeces (out of many that are present), some of which are also common industrial products used as food flavour, pesticide, or paint solvent:
The pheromone blend attracts all five juvenile stages as well as adult males and females, both fed and non-fed. These chemicals are thought to be detected at different positions on the antennae.
Bed bugs have a mating method unique to the Cimicidae family of insects, called traumatic insemination. The male stabs the abdomen of the female with its reproductive organ (called a paramere) to release the sperm into a specialised organ inside the right side of the female, the Organ of Berlese. The sperm migrate through the body cavity over several hours to fertilise the eggs.
Females that mate only once produce more eggs than those that are inseminated several times, which is thought to be a consequence of the wounds caused by repeated insemination.
A female bed bug can lay 200 to 500 eggs a month. The females lay eggs anywhere they crawl, either individually or in groups. The number of eggs laid at one time depends on the level of nutrition and the amount of sperm the female is carrying. The female can produce 1–7 eggs per day for about 10 days before having to feed again, but around 5–20 eggs from one blood meal.
Under optimal conditions about 97% of the eggs will survive and hatch. The eggs hatch over 6-10 days, producing the first instar (immature bed bug), which is about 1.5mm long. There are five instar stages, each one needing at least one blood meal before it can grow to the next instar stage. The instar has to moult (shed its skin) to grow at each stage, leaving behind the exoskeleton, which is a characteristic sign of a growing population of bed bugs.
The cycle from egg to adult can take about 37 days in optimal conditions of temperature (72°F/22°C) and feeding.
Bed bugs have to feed on blood every 5-10 days, only leaving their shelter to look for a host when they are starved. They tend to feed at night but if they are starved and cannot find a host at night will search for one at any time, especially if there is one nearby that tends to sleep or sit for long periods during the day. They can obtain additional moisture by absorbing it from the air, so humid conditions help them survive.
Under cool conditions adults can survive for a year without feeding, but under warm climatic conditions they can survive for about five months. Adult bed bugs have an average lifespan of 6–12 months.
Bed bugs are attracted by warmth, carbon dioxide and various body chemicals, which they detect using an array of sensing organs to find a suitable body for feeding on. Scientists have found a wide range of chemicals given off by animals that attract bed bugs. After feeding, the attractant chemicals become repellent, which causes the bed bugs to move away from a danger area.
Bed bugs won’t climb over your body; they crawl along the bedding and feed where your skin comes into contact with the bed, which means the bites will be on the side of your body that you are sleeping on, especially your face, neck and arms.
They need just 5-10 minutes of feeding to become engorged with blood and may spend less than 20 minutes on a host. After feeding or if it they cannot find a host and it is becoming light, they return to their shelter, so spend most of their life there.
Bed bug bites are similar to other insect bites such as from mosquitoes and fleas. However, one identifying factor is that they tend to occur in a line on exposed bare skin, especially:
The bites generally come in threes, which are sometimes called ‘breakfast, lunch and dinner’, so a line of three bites can be an identifying factor. If the bugs are disturbed while feeding they will bite multiple times in the same area and they then look like a skin rash.
People’s skin reaction to the bites varies from no reaction at all to red spots on the skin, minor skin swelling and itching. People sleeping in the same bed can have different reactions: one person can have no sign of bites and the other have itchy red spots, but both of them are likely to have been bitten.
The best way to tell that bites are caused by bed bugs and not other insects is to look for the tell-tale signs of the bugs themselves.
Bites itch because your body reacts to the saliva injected by the bed bug while it is biting you. Bed bugs, similar to other biting insects, have a complex mouth with one needle-like part that pierces the skin and other parts that are serrated and saw through the flesh to find a blood vessel. It also has a food canal to suck up blood and a canal that injects saliva containing anticoagulant and anaesthetic. The anticoagulant keeps the blood liquid so it keeps flowing and the anaesthetic stops you feeling the bite so you don’t disturb the feeding bug.
The body’s immune system recognises the foreign material and produces histamine as a defence mechanism. This causes localised inflammation and itching, but it is also the chemical that bed bugs themselves use to signal safe harbourage.
People have different rates of reaction to the bites depending on the sensitivity of their immune system to the foreign material injected during the bite: the body can take from half an hour to several days to react to a bite. The body also learns to recognise the ingredients in the saliva, so subsequent bites will produce a quicker reaction.
Bed bugs have been associated with more than 40 human diseases, according to a search of scientific literature carried out for a study by scientists from the University of Mississippi and Mississippi State University. There have been no confirmed cases, however, of any disease being transmitted from a bed bug to a human.
Studies testing whether hepatitis B, HIV, Chagas disease and filariasis could transmit to bed bugs through feeding on infected blood found the organisms did enter the insects, but there is no record of further transmission to humans.
Although it is not possible to prevent bed bugs being brought into a hotel, it is possible to prevent them spreading from the initial site by practicing due diligence.
The best strategy is to implement suitable measures to prevent an infestation taking hold:
It is important to know:
The typical signs of bed bugs are:
Bed bugs range in size from eggs around 1mm long to adults 4–5mm long, which is easily visible to the naked eye. They are most commonly found in bedrooms and sleeping areas because they need easy access to a blood meal at night. They are also found in upholstered chairs and sofas where people sit still for long periods.
In hotels, employees may also introduce them into places where they keep personal belongings.
The nymphs and adults need shelter to hide in, which can be any tiny space near where they can obtain a blood meal. As they locate their meal by sensing heat and carbon dioxide from breathing, they are more likely to shelter near sources of food.
Their bodies are very flat, so even adults can fit in a space as thin as a credit card. The places to look for signs of an infestation are in cracks, crevices, seams and folds, including:
Only a systematic search of potential harbourages will discover all the locations of an infestation:
Bed bugs are difficult to eliminate because of their life cycle and habits, so need an integrated approach to eliminate them economically and with minimal danger to people, property, and the environment.
This involves establishing a system of:
The simplest way to remove visible bed bugs is by using a vacuum cleaner with HEPA filter to contain fine particles that could be allergenic. This will remove a large part of the population but is unlikely to eliminate all of them.
Bed bugs cannot chew through material because they have mouth parts designed to suck blood, so it is easy to seal off any sources of access or harbourage. Sealing holes and cracks, sealing items in plastic bags, or mattresses in encasements will prevent them moving in or out.
Bed bugs are sensitive to extremes of temperature so can be eliminated by exposing them to a critical temperature for specified time — the higher the temperature the shorter the time required. Once their body reaches 55°C there is irreversible damage, but several days’ exposure at temperatures over 38.5°C can disrupt their feeding and reproduction. They are also killed by freezing at temperatures below -13°C for several days.
There has to be a balance, however between practicality of maintaining lower temperatures for long periods and damage to property caused by higher temperatures. When applying heat treatment to a room it is essential to ensure the heat reaches the centre of items such as furniture and bedding.
Rentokil’s Entotherm Heat Treatment service heats rooms and individual objects to between 56° and 60°C for several hours to kill bed bugs — and other insects such as cockroaches — and ensures even spread of heat by using heat sensors to monitor temperature at different points.
A number of fly species are attracted to food odours generated by kitchens: fruit flies, drain flies and filth flies, which includes house flies. Different fly species are attracted to different food products, including fermenting sugars, oils and fats, carbohydrates, and decaying proteins and vegetable matter. For pest control it is important to identify which species is present as each has different attractants and breeding habits.
Fruit flies are attracted to fermenting sugary liquids, in which they can feed and breed in very small amounts — in bars, kitchens and restaurants. The liquid can accumulate in:
Drain flies are attracted to rotting food, sewage and other organic waste material. They lay eggs in organic waste that can build up in drains or polluted shallow water. They can breed in the gelatinous bacterial films — biofilms — that form on surfaces in drains, septic tanks, compost, and are resistant to cleaning and pest-control chemicals.
House flies breed in decomposing waste such as rotting food and animal faeces.
Blow flies lay eggs in rotting meat, including kitchen and restaurant waste, and dead rats, mice and pigeons.
In warm conditions and with food supplies flies can multiply rapidly. They feed on faecal matter, garbage, rotting materials as well as stored and processed foods that will be present around commercial kitchens. They will regularly move between the contaminated food sources and clean areas, carrying contaminated filth on their bodies as well as microorganisms internally.
Flies can carry many microorganisms that cause disease in humans, including Salmonella, cholera, Campylobacter spp, E. coli, Cryptosporidium, parasitic worms and fungi.
Flies can pick up contaminated materials on their bodies, feet and mouth parts. Some regurgitate digestive juices and defecate while feeding and resting, contaminating foods and surfaces with microorganisms that can cause disease or decay. Fruit flies are not generally considered to be as great a health risk as other flies. However, they can also carry spoilage microorganisms and diseases.
The application of standard hygiene practices are particularly important for controlling flies to reduce the attractive odours, feeding material and breeding sites.
Maintaining barriers to flies, including:
As a last resort pesticide is applied using approved products applied by trained personnel following accepted practice.
Stored product insects (SPIs), also called pantry pests, include beetles, weevils, moths and mites (which are arachnids) that can infest food in storage. Most dried food products are susceptible to pest infestation, including cereal products, seeds, nuts, dried fruit, spices, powdered milk, tea and preserved meats. All stages of the pest can be present simultaneously in the food: egg, larva, pupa, adult.
SPIs are more likely to infest products that have been opened but can also enter packaging made of paper, cardboard, plastic, cellophane and foil, chewing through the packaging material or crawling through folds and seams. Larvae, especially, can make very small entrance holes that are difficult to detect.
Insects can contaminate large quantities through physical damage, faeces, cocoons, etc and with the introduction of microorganisms can cause further degradation, making food unfit or unacceptable for human consumption or for use in food preparation.
Food can become infested at any point in the supply chain, but is more likely to be infested in stores or when kept on shelves for long periods.
The common stored product pests and the foods they can infest are:
There is a very large number of species of beetle and weevil that feed on dried foods such as: cereals/grains, flour, seeds, nuts, pulses, dried fruit, chocolate, spices and processed products including pasta.
Signs of stored product pests include:
Following basic practices can minimise the risk of infestation:
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