Prevention and Control Measures of Citrus Huanglongbing and Application Ideas of Repellent Plants

[...]the disease affects more than 30 species of Rutaceae plants such as Citrus L., Poncirus Raf., Fortunella Swingle, Severinia Buxifolia and Murraya Paniculata. [...]it not only poses serious threat to citrus production, but also greatly threatens the conservation of diversity of citrus germplasm resources 15'101. According to a survey in Yongchun County, Fujian Province, more than 2 000 hm2 of trees were cut down only from January to July in 2007 due to citrus huanglongbing, and the output of Yongchun citrus declined by nearly 10 000 t. At the beginning of 2007, the cultivated area of citrus in Yanping District of Nanping City reached 6 872 hm2, but due to citrus huanglongbing, the cultivated area of citrus in the district was reduced to 5 067 hm2 at the beginning of 2009, with a yield reduction of nearly 10 000 t124-251. The above analysis manifests that the harms only caused by citrus huanglongbing are very severe. [...]it is urgent to understand the transmission routes and regularities of citrus huanglongbing; chemical and biological control measures; comprehensive control effects and other issues. 3Diagnosis Rapid diagnosis technology is the premise for prevention and control of citrus huanglongbing; which facilitates realtime monitoring; early detection and firm management. Deng conducted large-scale test for controlling medium D. citri in an orange orchard in Guilin from 2002 to 2005; and proposed that huanglongbing was the most important disease in citrus producing areas and D. citri was the most important insect pest of citrus. [...]a comprehensive control system against citrus huanglongbing with prevention and control of D. citri as the key should be implemented in citrus producing areas.