Red mites, specifically the poultry red mite or Dermanyssus gallinae, represent a persistent and frustrating challenge for backyard keepers and commercial poultry operations alike. These nocturnal parasites feed on the blood of birds, causing significant stress, reduced egg production, and in severe cases, anemia or death. Understanding what kills red mites requires a multi-pronged approach that combines environmental management, targeted treatments, and consistent diligence, as their resilience makes them difficult to eradicate with a single method.
Understanding the Enemy: Biology and Behavior
The effectiveness of any control method hinges on understanding the mite's life cycle and habits. Red mites hide in cracks and crevisions in poultry coops during the day, emerging at night to feed. They can survive for several months without a blood meal, making them hardy adversaries. They are not insects but arachnids, which means treatments effective against insects may not be as potent, necessitating specific acaricidal strategies.
Environmental Management and Physical Removal
Perhaps the most critical step in mite control is rigorous environmental management, as killing the parasites on the birds is only half the battle if they can simply re-infest them. This involves a thorough and systematic cleaning of the coop, run, and all nesting areas.
Remove all bedding and litter, sealing it in a heavy-duty plastic bag for disposal or thorough composting away from the area.
Scrub all surfaces, including walls, floors, roosts, and nesting boxes, with a strong detergent or disinfectant to remove organic matter where mites hide.
Use a pressure washer to physically blast mites and their eggs from cracks, crevices, and porous surfaces like wood.
Heat Treatment and Freezing
Extreme temperatures are highly effective at killing red mites at all life stages. After cleaning, applying heat can be a powerful tool. Using a steam cleaner on coop surfaces kills mites and eggs hidden deep within cracks. Alternatively, in warmer climates, leaving coops and equipment in direct sunlight for several days can create a furnace-like effect that eradicates the population. In colder regions, freezing is equally effective; equipment can be left outside during a deep freeze, or items can be placed in a sealed plastic bag and stored in a freezer for several days to ensure elimination.
Chemical and Natural Treatment Options
When environmental cleaning is insufficient, chemical or natural treatments are necessary to directly kill the mites on the birds and in the environment. The choice of treatment depends on the severity of the infestation and the keeper's preference for organic versus synthetic methods.
Synthetic Acaricides
For severe infestations, poultry-safe synthetic acaricides are often the most effective and fastest solution. Products containing permethrin or coumaphos are applied directly to the coop's surfaces, creating a residual barrier that kills mites on contact for weeks. It is vital to use products specifically labeled for poultry housing and to follow all safety instructions meticulously, ensuring birds are removed during application and the area is fully ventilated before reintroduction.
Natural and Organic Alternatives
Many keepers prefer natural treatments, which can be effective for light infestations or for use during ongoing prevention. Food-grade diatomaceous earth (DE) is a popular choice; when applied as a dust to coop surfaces and nesting areas, it damages the mites' exoskeletons, causing them to dehydrate and die. Essential oils, such as those from lavender, tea tree, and citronella, can act as repellents and mild acaricides, though they often require more frequent application and are generally less potent than synthetic options for eliminating established populations.
