Study on control effectiveness of Huanglongbing based on eradication of Asian Citrus Psyllid Diaphorina citri Kuwayama surrounding citrus orchard

In new citrus orchards,virus-free citrus seedling were planted,the Asian citrus psyllid Diaphorina citri was regularly monitored and controlled during the new shoot sprouting period,especially in the early summer shoot period and early autumn shoot period. Meanwhile,the host plants of citrus psyllid surrounding the citrus orchard were surveyed,and the citrus psyllid on these host plants were eradicated by regularly sprayed chemical pesticides in late February,early May,late August and late November each year. The results show that,the psyllid and Huanglongbing in citrus orchard were effectively controlled. The Asian citrus psyllid populations in citrus orchard were very low,the largest number of adults was 2. 25 per ha,and Huanglongbing was decreased gradually as well after the practice of this management,from 8‰ in 2008 to 0. 1‰ in 2012.