Tomato Leafminer (Tuta absoluta)

Tomato leafminer (Tuta absoluta) is a pest species belonging to the family Gelechiidae of the order Lepidoptera. Its primary host is the tomato, and it causes significant crop losses in tomato cultivation worldwide. Native to South America, this species was first identified in Türkiye in 2009 and rapidly spread to tomato production areas. Under favorable conditions, the tomato leafminer can form dense populations and cause crop losses of up to 80–100% if not controlled.

^{Tomato Leafminer Larva.} (Ministry of Agriculture and Forestry)

Adults are 6–7 mm long with a grayish-brown color and small black spots on their wings. Eggs are approximately 0.4 mm long and cream-yellow in color. Females lay eggs primarily on the undersides of leaves, buds, stems, and green fruits. Larvae undergo four developmental stages and feed by creating galleries within plant tissues. The pupal stage lasts about 9–11 days depending on environmental conditions. One generation is completed in an average of 29–38 days, and under suitable climatic conditions, up to 10–12 generations can be produced annually. Adults are active at night and hide among leaves during the day.

^{Tomato Leafminer.} (Ministry of Agriculture and Forestry)

The larvae of the tomato leafminer feed by creating galleries within leaves, stems, petioles, and fruit tissues. Damage to leaves reduces photosynthetic capacity and leads to leaf drying. Galleries formed in fruits promote rotting and significantly reduce market value. Although the tomato is the primary host, the pest has also been found to feed on potato, eggplant, pepper, and some weed species.

Integrated approaches are applied in the management of the tomato leafminer. Cultural measures include using pest-free seedlings, removing weeds from production areas, destroying plant residues after harvest, and covering greenhouse openings with mesh netting in protected cultivation. Sex pheromone traps are used for population monitoring.

In biological control, natural enemies of the pest are utilized. Species of Trichogramma act as egg parasitoids, while Nesidiocoris tenuis and Macrolophus species function as predators to suppress tomato leafminer populations. In chemical control, authorized plant protection products are applied based on monitoring results, with special attention paid to thorough coverage of leaf undersides during spraying.

The tomato leafminer is a major pest in both greenhouse and open-field cultivation, with a high reproductive potential under warm climatic conditions. In Türkiye, it has spread widely in tomato-producing regions, particularly in the Aegean and Mediterranean areas. Effective control requires the combined application of cultural, biological, and chemical methods.