Select 5 pits at random from the plot. Assess the total number of adults and nymphs 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.
The insect is with yellow body and white wings. Adult and nymphs remain on the lower surface of leaves and suck sap. They have an important role in transmitting mosaic virus in cucurbitaceous vegetables. Another white fly Aleurodicus dispersus is also observed in cucurbits.