How to get rid of flies
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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.
They affect customers in several ways, including causing illnesses, irritating bites, bad feeling, which can be expressed in many social media platforms and review sites, and loss of custom.
On this page you can find detailed information on these pests that affect hotels and commercial kitchens:
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.
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 and can contaminate large quantities through physical damage, faeces, cocoons, etc and the introduction of microorganisms that 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 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:
UC IPM. Cockroaches. University of California Agriculture and Natural Resources, Integrated Pest Management Program. (link)
Keener, K. Safe food guidelines for small meat and poultry processors. A Pest Control Program. Purdue Extension, Purdue University.
Lupo L. Control of small flies. Quality Assurance Magazine. 31 March 2015.
Lupo L. Controlling Flies: Large and Small. Quality Assurance Magazine. 13 August, 2013.
Lupo L. Cockroach FAQs. Quality Assurance Magazine. June 3, 2014.
Sela, S et al. Mediterranean Fruit Fly as a Potential Vector of Bacterial Pathogens. Appl Environ Microbiol. 2005 Jul; 71(7): 4052–4056. doi: 10.1128/AEM.71.7.4052-4056.2005
UNIDO. Good Manufacturing Practices: Pest Control. Paper 9. (link)
WHO. Public Health Significance of Urban Pests. Copenhagen, 2008. ISBN 978-92-890-7188-8. (link)