Midges could be tiny, but their impact on agriculture and animal health is far from avoidable. Belonging to the order Diptera, these little insects include several species capable of causing extensive damage to the crops and transmitting serious livestock diseases. Though, not all midges damage plants directly, biting midges are equally concerning because of their ability to spread viral diseases among livestock.
A recent study led by Queen’s University Belfast, in collaboration with The Pirbright Institute and the Agri-Food and Biosciences Institute (AFBI), has revealed that biting midges can transmit several economically devastating diseases, including bluetongue virus, African horse sickness virus, and Schallenberg virus. One of the study’s most striking findings was the remarkable cold tolerance of midge eggs. Researchers found that the eggs survived temperatures as low as -18°C, suggesting that they may persist through harsh winters and cause disease outbreaks when conditions get favourable.
Concerns About New Species
A recent study in India has highlighted the growing importance of monitoring midge populations. The research team led by Dr. D. M. Firake, Senior Scientist at the ICAR-Directorate of Floricultural Research (ICAR-DFR), Pune, identified a new species of blossom midge, Contarinia icardiflores sp. nov., attacking flower buds of Jasminum sambac, commonly known as jasmine. This is a significant breakthrough in entomology, as blossom midges belonging to the genus Contarinia are already recognised worldwide as destructive pests of ornamental and food crops.
It was observed that the newly identified species can complete its life cycle within mere 16 to 21 days, allowing populations to build up rapidly under favourable conditions. By feeding on developing flower buds, the insect reduces flower production and quality, posing a serious threat to jasmine cultivation.
How to Control Midges?
Managing midge populations requires a combination of monitoring, biological control and predictive tools rather than relying only on pesticides. Recent advances have strengthened surveillance programmes for swede midge in the Northern Great Plains, where pheromone-baited traps placed along field margins are used in coordinated monitoring efforts. This community-based approach helps confirm the absence of the pest in vulnerable regions, supports quarantine decisions and enables early detection should the insect spread into new areas.
Biological control has also delivered some encouraging results. Field studies combining flowering field margins with targeted applications of the beneficial nematode Heterorhabditis bacteriophora have demonstrated enhanced suppression of swede midge and other brassica pests. While the nematodes attack multiple pest species, flowering habitats provide food and shelter for natural enemies, creating a more balanced ecosystem. Together, these complementary strategies have reduced crop damage and yield losses more effectively than either method used independently.
Researchers are also using temperature-based forecasting models to improve pest management. Research on the invasive apple leaf-curling midge has established the thermal requirements needed for its development, showing that approximately 614 degree-days at 20°C are required to complete the life cycle from egg to adult. Such models enable farmers to predict peak pest activity, allowing monitoring and control measures to be timed more precisely and reducing unnecessary pesticide applications.
Another promising development is the application of nanotechnology in crop protection. Nanopesticides are designed to deliver pesticides more accurately while minimising environmental contamination. These formulations fall into two broad categories. Type 1 nanopesticides use metal-based nanoparticles such as silver, copper and titanium, which possess strong antimicrobial properties. Type 2 nanopesticides encapsulate active ingredients within nanocarriers made from polymers, clays or natural materials such as zein proteins. These advanced delivery systems improve pesticide efficiency, reduce chemical runoff and lessen harmful effects on beneficial microorganisms and surrounding ecosystems.
Conclusion
With climate change and global trade, changing agricultural practices continue to reshape pest dynamics. With new discoveries being made in the midge world and risk of diseases constantly evolving, continued research becomes more than essential to protect agricultural productivity. Use of nanopesticides may also prove as a promising control method. Thus, by combining scientific innovation with environmentally responsible practices, farmers can better safeguard crops, livestock, and livelihoods against these tiny but highly destructive pests.
References:
Contarinia icardiflores sp. nov: New Blossom Midge Species Named After ICAR-DFR | ICAR
Midges surviving extreme cold conditions may contribute to future bluetongue | News | Queen’s University Belfast
Management Strategies for Midge Pest Populations | Crop and Pasture Protection | Crop and Pasture Production | Applied sciences | Topics | Nature Index
Frontiers | Insect pest and plant disease management in horticultural crop production: recent insights provide opportunities for improved control
Photo Credit: Shutterstock/Vinicius R. Souza
