Amber fruit fly

Systematic position. The amber fruit fly (Chaetorellia succinea) belongs to the order Diptera and the family Tephritidae. This insect is a specialized phytophagous species known for its specific host plant preferences within the Asteraceae family.

Host plants. The primary crop at risk is sunflower (Helianthus annuus). Furthermore, the pest maintains populations on various wild Asteraceae species, such as thistles and knapweeds, which serve as natural reservoirs throughout the growing season.

Biology and life cycle. Chaetorellia succinea typically overwinters as a puparium within the soil or debris. Adult flies emerge in late spring or early summer, depending on regional climatic conditions. They feed on floral nectar and pollen before females begin laying eggs directly into the developing sunflower heads.

Nature of damage and economic impact. The larvae bore into the sunflower receptacle and feed on the developing seeds. This feeding process results in:

• destruction of individual seeds;
• reduction in overall seed weight and oil content;
• potential entry points for secondary fungal infections;
• significant harvest losses in untreated fields.

Protection measures. Integrated pest management (IPM) is essential for controlling Chaetorellia succinea. Key practices include deep autumn tillage to bury overwintering pupae and the destruction of wild host plants near the crop fields. During the critical periods of head formation, the application of chemical insecticides may be necessary to manage fly populations and minimize economic damage.