**Abstract**

The South American tomato pinworm or tomato leaf miner (TLM), *Tuta absoluta* (Meyrick) (Lepidoptera: Gelechiidae), is a serious invasive and destructive insect pest of tomato (*Solanum lycopersicum* L.) worldwide. The moth can cause 100% damage in tomato crop in both greenhouses and open fields if control measures are not carried out. Due to the high reproduction potential, dispersal ability, and tolerance to environmental conditions, the TLM invaded most tomatoproducing countries in Europe, Africa, and Asia. The tomato leaf miner originated in South America and was first introduced in Spain in 2006 and from where it spread to other part of the world. This chapter consolidates the rich literature on the pest with emphasis on invasion history, economic significance, and possible management options adopted worldwide.

**Keywords:** tomato leafminer, *Solanum lycopersicum*, invasive potential, management, Gelechiidae, quarantine pest
