Heatwave Pressures

Extreme heat is altering pest behaviour worldwide, increasing activity, migration and management challenges across sectors globally.

The world is currently experiencing a second significant period of extreme heat this year, with temperatures exceeding 40°C across multiple regions. While the impact on people, infrastructure and agriculture is widely recognised, extreme heat can also have important implications for pest activity and pest management. 

Many pest species are heavily influenced by environmental conditions. As temperatures rise, insects can develop more quickly, allowing populations to increase faster than they would under more moderate conditions. In some cases, warmer weather may lead to additional generations being produced within a single season, increasing pest pressure on businesses and public spaces. 

Heatwaves can also change pest behaviour. During prolonged periods of hot, dry weather, pests frequently search for dependable sources of food, water and shelter. This can lead to increased activity in and around buildings, including food production facilities, hospitality venues, healthcare settings and residential properties. [

Ants are often among the most visible pests during hot weather, expanding their foraging range as they search for moisture and food sources. Flies may also become more problematic where warm conditions coincide with waste accumulation or standing water. Rodents can be driven towards properties offering cooler environments and access to water, particularly where outdoor conditions become increasingly harsh. 

For businesses operating in sectors where hygiene and compliance are essential, changing pest behaviour can create additional challenges. Increased activity around food handling areas, waste storage locations and building perimeters may heighten the risk of infestations if preventative measures are not maintained. 

Not all pests benefit from extreme heat. Some species can experience reduced survival rates when temperatures exceed their tolerance limits. However, the overall effect of prolonged heatwaves is often a shift in pest behaviour, distribution and activity patterns that requires close monitoring and proactive management. 

As extreme weather events become more frequent around the world, pest management professionals will continue to play a vital role in helping businesses and communities respond to evolving pest pressures. Regular inspections, effective monitoring, good sanitation practices and robust proofing measures remain key components of successful pest management programmes, particularly during periods of sustained high temperatures. 

Understanding how pests respond to extreme heat enables businesses to take preventative action before problems develop. As with many aspects of pest management, prevention remains the most effective line of defence.