The leaf miner - slow killer

Leaf miners are the larvae of several different insects. Leaf miners feed on the nutrients in leaves, mining out the plant tissue and creating white trails on the foliage. On vegetable crops, the most common leaf miners belong to the genus Liriomyza.
Affected leaves lose vigor and fall off, eventually causing a slow death to plant (or) just slows down the growth of it.

In my garden, i've seen these on tomato leaves and in some Indian spinach (palak) leaves.

Here are some tips to fend off these bugs in a natural way...

• Immediately remove the infected leaf.
• These flies have some natural predators, some wasps will prey on it. Stop using chemical insecticides, because this can kill the predators as well.
• Try to cover Spinach (especially) leaves to prevent adult flying insects from laying eggs.
• Feed the plants with good water and nutrients, so that they can recover from the infestation.
• Prevent debris or dirt heap in the garden, because these will attract the insects.
• You can also use Neem oil regularly to fend off these bugs.