Thirty leaves are sampled randomly through out the for viable eggs. The pest population measurement level is eggs per leaf. Monitoring should begin in the early stages of the crop. A sampling of 50 randomly chosen leaves in a small area, around 0.5 acres. The pest population measurement level is number of Thrips per leaf.
Monitoring is done on both young and mature fruit.
Twenty-five fruits are checked randomly in the field for damage, such as a water soaked appearance in mature fruit and distorted appearance in young fruit.