Entrance reducer with slider, 375 mm, made of plastic
Entrance reducers, such as those offered by Lyson, play a crucial role in beekeeping by managing the hive's entrance size. These devices offer several benefits that contribute to the health and security of bee colonies. One of the primary advantages of using an entrance reducer is the enhanced protection it provides against robbers and pests. By reducing the entrance size, it becomes easier for guard bees to defend the hive against intruders, including other bees attempting to steal honey and pests like wasps.
This is particularly important during periods when the hive is vulnerable, such as when the colony is small or weak. Entrance reducers also play a significant role in disease prevention. By limiting the entrance size, they help reduce the spread of parasites and pathogens within and between colonies. For instance, entrance reducers can help contain the spread of varroa mites, a significant threat to bee health, by preventing robber bees from entering and leaving the hive with these parasites.
Moreover, entrance reducers contribute to the regulation of the hive's internal environment. A smaller entrance can help maintain a more stable temperature within the hive, which is crucial for the bees' survival during colder months.
 This can also be beneficial in managing ventilation and ensuring that the hive does not become too hot or too cold, depending on the weather conditions. Lyson offers entrance reducers made of durable materials, such as plastic and stainless steel, which are designed to fit various hive types, including the popular Langstroth hives. 
These reducers often come with adjustable features, allowing beekeepers to customize the entrance size according to the colony's needs and the external conditions.