Downy emerald

The downy emerald (lat. Cordulia aenea) is a dragonfly species belonging to the family Corduliidae. Known for its metallic green and bronze coloration, this insect is a skilled flyer typically found near ponds, lakes, and woodland edges. It is a well-known member of European odonate fauna.

In an agricultural context, the downy emerald is not a plant pest. It is an obligate predator that feeds on other flying insects, including midges and mosquitoes. There is no evidence suggesting that this species feeds on or damages any cultivated crops, grains, vegetables, or fruit trees. Therefore, it causes no economic damage to farming activities.

The life cycle of the downy emerald is aquatic. Females lay eggs in water, and the larvae develop as nymphs for several years. These nymphs are voracious predators living among aquatic vegetation, feeding on other invertebrates. Once mature, they emerge from the water and transform into the adult dragonfly stage, which lives for a much shorter period.

There are no associated signs of plant damage or disease caused by this species. Its presence on farmland is actually indicative of a healthy environment. Unlike true agricultural pests, the downy emerald provides ecosystem services by preying on nuisance insects, making it a highly beneficial inhabitant of the agricultural landscape.

• Supports biodiversity in agricultural zones.
• Acts as a natural predator of insect pests.
• Requires healthy aquatic habitats to thrive.

No pest control measures are required or recommended for this species. Pesticide usage should be carefully managed to avoid runoff into aquatic environments, which would harm both the larvae of the downy emerald and the overall biodiversity. Protecting water sources ensures that these beneficial predators continue to thrive.