- Both the adults and grubs cause damage to leaves by scraping and skeletonizing the leaves.
- Gradually the leaves dry up.
Select 5 pits at random from the plot. Assess the total number of grubs and pupae from 6 leaves from each pit (For this select 3rd to 8th leaves from the tip of a vine trailing on the pandal) and work out average per leaf. Less than 5 -Mild,5-10 Moderate >10 severe.