Abstract:

he Asian citrus psyllid, Diaphorina citri Kuwayama. (Hemiptera: Psyllidae), was an important medium pest spreading the devastating citrus disease knew as huanglongbing (HLB). In order to know its filed occurrence and dispersal, its filed population dynamics and dispersal was monitored by the condition that the insect could not survive in the north in winter and spread in spring in Lechang of Guangdong Province from 2010 to 2011. The results showed that: there was a small amount of the adult population in the central and south of Lechang in winter. It started laying eggs in late-March, and then its population developing fast from June to October. The adult populations reached the peak in mid-November. A few adults were firstly monitored dispersal to north for 5 km in early May, and then dispersal to north again for 2.5 km in mid-June, but the number of dispersal adults was not too much. Correlation analysis showed that its population density was significantly positive correlation with filed air temperature and flush shoots but no correlation with the relative humidity. Its field dispersal was significantly positive correlation with filed daily air temperature, daily maximum temperature and daily minimum temperature, but no correlation with daily relative humidity or daily wind.