- As a result of the thrips lacerating and sucking of plant sap rolling up and fading away of the leaf tips result.In the case of very young seedling the leaves wither.
Randomly select 4 one meter plots per 0.4 Ha. From each plot select 5plants/ hills. Look for the infestation. Rate infestation as mild if there are less than 3 needle like leaves and as severe if there are more than 3 out growths with lower leaves also showing chlorosis and scorching.