Fig beetle

The Fig beetle (Cotinis mutabilis), part of the Scarabaeidae family, is a significant insect pest known for its iridescent green appearance and aggressive feeding habits during the summer months. Commonly found in warm regions, these beetles are highly active fliers during the hottest parts of the day.

Biologically, the species undergoes complete metamorphosis. Larvae typically reside in damp, organic-rich soil or compost piles, where they feed on decaying matter. While the larvae are largely beneficial decomposers, the adult beetles emerge from the soil in mid-summer, seeking high-sugar food sources, which leads them directly to ripening fruit in orchards.

The primary damage is caused by adult beetles feeding on the soft tissues of ripening fruit. They possess specialized mouthparts that allow them to pierce the skin of fruits like figs, grapes, peaches, and various berries. This feeding activity not only destroys the market value of the crop but also promotes the growth of secondary pathogens such as fungal rot.

Key signs of infestation include large, irregular cavities in fruit that are still on the tree or fallen to the ground. In addition to fruit, adult beetles are frequently attracted to the sap of damaged trees and the nectar of certain flowers, which can sometimes interfere with plant health or aesthetics in ornamental gardens.

Control strategies should focus on sanitation and physical barriers. Removing overripe fruit from the ground and covering trees with fine netting are the most effective non-chemical methods. Additionally, managing compost heaps to prevent larvae development and utilizing sticky traps or bait stations can help suppress beetle populations significantly without the excessive use of pesticides.