Chicory leaf miner

Systematic position: The chicory leaf miner (Napomyza cichorii) belongs to the order Diptera and the family Agromyzidae. It is a specialist phytophagous insect that has evolved to feed specifically on plants within the Asteraceae family.

Host plants: This pest primarily targets chicory crops, including radicchio and witloof chicory. It may also infest other related wild or cultivated Asteraceae, which often serve as alternative hosts during the periods when main crops are not available.

Biology and life cycle: The life cycle of Napomyza cichorii consists of egg, larva, pupa, and adult stages. Females lay eggs inside the leaf tissue. Upon hatching, larvae begin mining the parenchyma. The species can complete multiple generations annually, significantly increasing the infestation pressure as the season progresses.

Damage and economic impact: The larvae are responsible for the damage. By tunneling through the leaves, they create serpentine mines that interfere with photosynthesis. This damage stunts plant growth, reduces the crop quality, and in severe cases, leads to total necrosis of the foliage, significantly reducing harvest yields.

Control measures: Managing the chicory leaf miner requires a multi-faceted strategy:

• implementing crop rotation to disrupt the insect life cycle;
• removing and destroying infested plant debris;
• controlling wild host weeds near fields;
• monitoring adult activity and applying selective systemic insecticides when necessary.