Citrus leaf miner

The Citrus leaf miner (Citriphaga citrella, taxonomically recognized as Phyllocnistis citrella) is a destructive pest belonging to the order Lepidoptera and the family Gracillariidae. It is a significant threat to citrus production globally, specifically targeting new foliage.

The pest primarily attacks citrus trees, including oranges, lemons, limes, and grapefruits. It shows a strong preference for tender, young leaves, which makes nurseries and young orchards particularly susceptible to heavy infestations during flush growth periods.

The life cycle involves four stages: egg, larva, pupa, and adult. The adult moth deposits eggs on the underside of young leaves. Upon hatching, the larvae immediately mine into the epidermis of the leaf, consuming the leaf tissue while moving in a serpentine pattern.

The damage is easily identified by the characteristic silvery, winding tunnels or "mines" on the leaves. Severe infestations cause leaf curling, stunted growth, and premature leaf drop. Furthermore, the physical damage often promotes the development of secondary bacterial diseases, such as citrus canker.

Integrated pest management strategies include the following:

• Monitoring population levels using pheromone traps.
• Application of systemic insecticides during new growth flushes.
• Encouraging natural biological control agents, such as parasitic wasps.
• Maintaining healthy tree vigor to help the plant tolerate light infestations.