Fig. 5

Demonstration of bioassay. To maintain the freshness of leaves, plant leaflet was placed in a 0.5 mL centrifuge tube with the petiole in water agar. Insect sucking equipment was designed by connecting a rubber tube to a syringe, which was used to intake white flies from plant leaves and transfer into the test tube. There were 20 adult B. tabaci in each tube. The tube was covered with a cotton plug