Robber flies (Asilidae)
Robber flies (family Asilidae, order Diptera) are a group of robust, bristly, and highly efficient predatory flies known for their aerial hunting skills. They possess a strong, piercing-sucking proboscis designed to immobilize prey by injecting neurotoxic saliva. Found globally, these insects inhabit various environments including agricultural fields, meadows, and woodlands.
What the section contains
Andrenosoma robber fly
Andrenosoma
Blue-tailed robber fly
Neoitamus cyanurus
Common robber fly
Dysmachus trigonus
Dasypogon diadema
Dasypogon diadema
Dioctria robber fly
Dioctria
Dioctria rufipes
Dioctria rufipes
Hornet robber fly
Asilus crabroniformis
Large robber fly
Machimus maximus
Leptogaster
Leptogaster
Leptogaster cylindrica
Leptogaster cylindrica
Robber flies
Dasypogon
Robber fly
Laphria
Robber fly
Asilus
Robber fly
Neoitamus
Robber fly
Dysmachus
Robber fly
Machimus
Yellow robber fly
Laphria flava
Yellow-tailed robber fly
Andrenosoma fulvicaudum
Robber flies (Asilidae)
The life cycle of Asilidae consists of egg, larval, pupal, and adult stages. Females typically lay eggs in soil, decaying organic matter, or under tree bark. Larvae are generally soil-dwelling predators that feed on other insect larvae, including those of various agricultural pests. Depending on the species and environmental conditions, the development from egg to adult can take one to three years.
The impact of robber flies on agriculture is complex. While they act as predators that can help control certain pest populations, their lack of prey specificity means they often consume beneficial insects. Most notably, they are known to prey on pollinators such as honeybees, which can negatively affect the productivity of orchards and crops reliant on insect pollination.
The damage caused by robber flies is not direct feeding on plant tissue, but rather the disruption of the local insect balance. By targeting pollinators, they can reduce the fertilization rates of crops. Furthermore, in areas with high densities of robber flies, their predation on natural enemies (such as parasitoid wasps) may indirectly lead to an increase in secondary pest outbreaks.
Management strategies for robber flies are rarely focused on eradication, as they are part of the natural biological community. Instead, focus is placed on minimizing their impact on sensitive areas:
- Protecting beehives with exclusion netting or defensive barriers;
- Implementing integrated pest management (IPM) to maintain healthy levels of non-target beneficial insects;
- Soil management techniques that discourage larval development in specific garden areas;
- Monitoring seasonal population spikes during peak pollination windows.