The Harmful Characteristics of Fruit Flies and Introduction to Control Methods

Fruit flies are a group of tiny fly insects widely distributed in orchards, vegetable gardens and agricultural product storage and transport sites. Their harm mainly comes from the fruit-boring feeding of the larvae; the adults like to lay eggs on ripe, cracked or wounded fruit, and the hatched larvae tunnel into the flesh to feed, causing the fruit to soften and rot, drop prematurely, and drop markedly in market value.

Fruit flies have omnivorous feeding habits and a wide host range; peaches, plums, cherries, grapes, citrus, Chinese bayberry (Morella rubra) as well as tomatoes and other fruits and vegetables may all be damaged. Species represented by the spotted-wing drosophila (Drosophila suzukii) can also pierce intact fruit skin with their ovipositor and lay eggs directly on healthy fruit, making the damage more hidden. Damaged fruit often shows no abnormality in appearance at first, and only later develops softening, sunken spots and water-soaked spots, often becoming conspicuously exposed during harvesting, storage and transport and causing rot in whole batches.

Fruit flies reproduce quickly and have many generations, and the adults are good at flying, able to travel back and forth between fields and warehouses to spread, so integrated measures are needed for control. Orchard and garden sanitation is the foundation: fallen fruit and rotten fruit should be picked up promptly and taken out of the orchard for disposal to reduce the source of insects; during the adult activity period, sugar-vinegar solutions or traps can be hung to trap and kill adults; physical measures such as bagging fruit, timely harvesting and installing insect-proof nets can also significantly reduce the damage, and when necessary chemical control can be added, with attention paid to pesticide safety.

Overall, although fruit flies are small individually, they often cause concentrated damage at the key stage of fruit ripening, directly affecting yield, quality and income. Only by understanding their occurrence patterns and carrying out monitoring and prevention in advance can losses be kept at a relatively low level.