Bumblebee hoverfly

The bumblebee hoverfly (Volucella bombylans) is a species of hoverfly in the family Syrphidae. It is famous for its effective Batesian mimicry, as its appearance closely resembles that of various species of bumblebees, allowing it to enter their nests undetected.

In agriculture, this species is noted for its impact on managed bumblebee colonies. While the adult fly is a harmless pollinator of many wildflowers, the larval stage lives inside the nests of bumblebees and social wasps, where it functions as a scavenger or a facultative parasite.

The life cycle involves the female fly laying eggs inside the nesting cavity. Once hatched, the larvae consume organic debris within the nest. In high-density infestations, their presence can disturb the colony hierarchy and negatively affect the development of the bumblebee brood, which is essential for greenhouse pollination.

The economic harm is primarily indirect, manifesting as a decrease in the efficiency of bumblebee colonies used for the commercial pollination of indoor vegetable crops. Weakened colonies are less likely to forage effectively, leading to lower fruit set and reduced crop yield in tomatoes and peppers.

Effective management and protection strategies include:

• Implementing physical barriers like fine mesh netting on greenhouse vents.
• Regular inspection and hygiene protocols for all bumblebee nesting boxes.
• Maintaining strict sanitation in facilities where commercial pollinators are kept.
• Monitoring the population density of adult hoverflies around greenhouses during peak flight seasons.