Warmer temperatures and longer daylight hours are contributing to increased activity among mosquitoes and other biting insects, according to entomologists. Dr. Mojca Kristan, an assistant professor in medical entomology at the London School of Hygiene and Tropical Medicine, noted that current weather conditions in the UK are optimal for mosquito populations, citing warmth and the availability of standing water for egg-laying.
"As the weather continues to warm up, I would expect mosquitos to emerge and start biting to get the blood they need to breed," Kristan stated.
Research from Wasp-Eze indicates that a significant portion of Britons are bitten inside their homes, with July marking peak insect season. Experts recommend a variety of spray-free methods to combat these pests.
Natural Scents
Certain natural scents can make areas less attractive to mosquitoes or interfere with their ability to locate humans. Daniel Steward, Managing Director at Shield Pest Control, highlighted lemon eucalyptus, citronella, lavender, and peppermint as effective deterrents. Lemon eucalyptus, containing the active ingredient PMD, can offer approximately 4–6 hours of protection by interfering with mosquito olfactory receptors. Citronella's compounds, such as citronellal and geraniol, help mask human scents that attract mosquitoes. Lavender contains linalool and linalyl acetate, which are thought to reduce mosquito attraction, and can be used as an essential oil diluted with a carrier oil or in diffusers. Peppermint's strong compounds, menthol and menthone, can also disrupt mosquitoes' scent-detection abilities.
Physical Barriers and Household Remedies
Tina Loveland, Senior Designer at insect screen manufacturer Appeal Shading, suggests that insect screens on windows and doors are the most effective way to prevent insects from entering homes. For those without screens, placing cucumber slices in areas can deter ants. "The only foolproof way" to deal with mosquitos is to prevent them from entering, Loveland said.
White vinegar mixed with water in a spray bottle can be applied around window frames, sills, and doorways to deter insects, according to Mike Rondas, General Manager at Wasp-Eze. Adding essential oils like peppermint or lavender can enhance this repellent and add a fresh scent. Fresh herbs such as basil, mint, rosemary, and lavender, when placed on windowsills or in window boxes, can also act as natural deterrents.
An apple cider vinegar trap, consisting of a bowl of apple cider vinegar with a drop of washing-up liquid, is cited as an effective method for eliminating flies by attracting them and breaking the surface tension so they sink.
Orange peel can also deter insects due to a compound called D-limonene found in citrus oils. Placing fresh peels near entry points like windowsills and doorways can help. Combining orange peels with cloves can create a stronger aroma that is particularly off-putting to insects, making it useful for outdoor settings.
Caulking windows to seal small gaps and cracks creates a stronger physical barrier against pests like flies, ants, and spiders, as noted by Mark Sage, B&Q's Horticultural Expert.
Gadgets and Repellents
Pharmacist Abbas Kannai mentioned that gadgets such as electric insect traps and UV light devices can be useful in enclosed spaces, though they may be less effective against mosquitoes than repellents or physical barriers. Fans can also be effective, as their airflow makes it difficult for weak-flying mosquitoes to land.
For conventional repellents, Kannai advises choosing products containing proven active ingredients like DEET, picaridin, or lemon eucalyptus extract (PMD). It is recommended to reapply repellent as per manufacturer instructions, especially during dawn and dusk when mosquitoes are most active.
Supplementary and Natural Options
Spray-free patches infused with essential oils like citronella or lemon eucalyptus can offer localized protection when stuck to clothing, according to Daniel Steward. However, their effect is generally short-lived and limited to the immediate area. Bands and wristbands that release essential oils also provide localized protection but are not considered a primary defense.
Catnip is also being cited as a mosquito repellent due to its compound nepetalactone. While some studies suggest it can perform comparably to synthetic repellents, its effect is relatively short-lived and less practical than dedicated repellents, making it best used as a supplementary measure.
Thermacell devices create a zone of protection but are most effective in still conditions, as a breeze can disperse the active vapor. They are useful for areas like patios but protect a set space rather than an individual.
Certain body oils, like Avon's Skin So Soft Dry Oil Spray, which contains jojoba oil and citronellol, may help deter bugs despite not being formulated as repellents. Its moisturizing properties also make it suitable for post-sun use.