Studying the Effects of Some Insecticides on Different Developing Stages of Asian Citrus Psyllid, Diaphorina citri Kuwayama in Field Conditon

One of the serious plant diseases in Iran is Citrus Greening disease. Trees infected with the disease die within a few years. Research on the vector is essential due to the presence of its vector, Diaphorina citri, in our country. Because of high reproduction rate and rapid development, this insect has a propensity to develop resistance to many classes of insecticides. One way to delay pest resistance is application of insecticides from different classes, so studying new insecticides is essential and inevitable. This experiment was done based on a completely randomized block design with 6 treatments (clothianidin (300 ppm), acetamiprid (500 ppm), Dimillin® (750 ppm), chlofluazuron (400 ppm), pyriproxifen (750 ppm), and control (spray with water)) and three replications A two-year study (2011 – 2012) was conducted in a citrus garden in Kerman Province. Sampling of trees was performed one day before spraying, and on the 3rd and 10th day after treatment. Ten days after spraying, the highest and lowest mortality percentage (89.88, 27.34) were observed on clothianidin and pyriproxifen, respectively. Ten days after spraying, efficacy on nymphs were 83.18, 7.94, 84.80, 74.32 and 63.33 percent for clothianidin, stamiprid, diflubenzuron, chlofluazoru and pyriproxyfen, respectively. Diflubenzuron and pyriproxyfen had lower efficacy on adults compared to nymphs. In general, all insecticides, except pyriproxyfen, can be recommended for citrus psylla control.