Effects of Different Hanging Heights and Colours of the Yellow Board on the Trapping of Dialeurodes Citri

In order to explore the green control method of Dialeurodes citri, the experiment of trapping Dialeurodes citri with yellow board was carried out to study the effects of different hanging heights and colours of the yellow boards. The results showed that the average daily trapping amount of Dialeurodes citri from high to low was 50 cm below the canopy, 20 cm below the canopy and canopy level. The trapping effect of 50 cm below the canopy was the best, its average daily trapping amount was 28.3, which higher than the amount of 20 cm below the canopy, and significantly higher than the canopy level. The daily average trapping amount of yellow board with different colours from high to low was yellow, orange and light yellow. The trapping effect of yellow board was the best, its daily average trapping amount was 29.65, slightly higher than orange yellow one and significantly higher than light yellow one.