Aster leaf miner

Calycomyza humeralis is a species of leaf mining fly belonging to the family Agromyzidae within the order Diptera. This pest is widely recognized for its preference for Asteraceae plants, causing significant economic and aesthetic damage to both greenhouse and landscape vegetation.

The primary host plants for this species include various members of the Aster family, such as asters, chrysanthemums, and goldenrods. The larvae feed internally on the leaf tissue, which creates distinct mining patterns and leaves the plant vulnerable to secondary infections or physiological stress.

The life cycle consists of the egg, larval, pupal, and adult stages. Adult females insert eggs into the leaf epidermis. Once hatched, the larvae excavate tunnels through the mesophyll of the leaf. Development time can vary depending on temperature, and pupation typically occurs either inside the mine or in the soil or plant debris.

Damage is characterized by the presence of meandering, serpentine mines on the leaf surface. As the larvae grow, these mines widen, which can lead to the necrosis of leaf tissue. In severe infestations, the foliage may curl, wither, and prematurely drop, which significantly hampers the plant's ability to undergo photosynthesis.

Management of Calycomyza humeralis requires an integrated approach. Sanitation is crucial; removing infested plant parts reduces the localized population. For commercial operations, systemic insecticides are the most effective way to eliminate larvae inside the leaf tissue. Monitoring adult flies with yellow sticky cards helps determine the optimal timing for chemical applications.

• Removal and destruction of infested foliage.
• Application of systemic insecticides.
• Use of yellow sticky traps for population monitoring.
• Control of weeds that serve as alternative host plants.