Leaf Miner insects are very small. They burrow inside the leaves and make tunnels.
These tunnels look like white stripe ridges on the watermelon leaves.
The adult moth is light yellow in color and the baby moth is very small and footless . This moth makes a tunnel in the leaves and in this tunnel the pupa is formed.
Insect infestation occurs on the leaves. A spiral tunnel is formed on the affected leaf. Photosynthesis of plants is affected . Hence, the leaves fall.
For the control of this insects use , Abamectin 1.9% EC @ 150 ml/acre or Chlorantraniliprole 8.8 + Thiamethoxam 17.5% SC @ 200 ml/acre or Cyantraniliprole 10.26% OD @ 300 ml/acre