Leaf miner is a term that is used to describe the larvae of many different species of insects, which live in and eat the leaf tissue of plants. The vast majority of leaf-mining insects are species of moths and flies, although some beetles and wasps have also exhibited this behavior.
Leaf miners are generally regarded as a serious insect control problem by farmers and gardeners, as they can cause extensive damage to agricultural crops and garden plants.
Because Leaf miners are protected inside the plant’s leaves, it makes it extremely difficult to control these pests, using insecticides. As such, to prevent a Leaf miner invasion, “trap crops” are often planted near the valuable fields; that must be protected.