4.6.7
MONITORING AND MANAGEMENT OF PLANT QUARANTINE DISEASES IN CHINA

WANG YANQING and WANG CHUNLIN

National Agro-Technical Extension and Service Center, Beijing 100026, PR China

Background and objectives
Agriculture is a fundamental industry of China. In accordance with the relevant laws and rules of China, two kinds of plant quarantine diseases have been monitored and managed. These are plant quarantine diseases for entry into and exit from China, and diseases for domestic plant quarantine (including domestic agriculture and forest plant quarantine). Diseases in different parts of China are treated with different measures to prevent them from spreading and causing damage. In 1995, the Ministry of Agriculture issued new domestic plant quarantine objectives. Seven kinds of plant diseases were listed [1, 2]. How to prevent them from spreading and to control or even eliminate them is still a great challenge.

Results and conclusions
Radopholus similis, found in Nanjing, Fujian province in 1988, had been eradicated by 1993. Various measures (chemical combined with other agricultural techniques) were used to control the nematode. To eliminate Xanthomonas campestris, field tests showed rice seed dressing after sterilizing seed gave good control after transplanting rice shoots. Grafting with scion wood of Wenzhou tangerine helped establish a disease-free nursery to control Xanthomonas campestris pv. citri and Diaphorina citri. Agrochemicals to control those diseases have also been used. Problems in monitoring and management of quarantine diseases include amendment of the variety of quarantine diseases, especially those of flower and vegetables, and further improvement of quarantine standards and quarantine techniques such as those for restricting Phytophthora megasperma.

References
1. National Agro-Technical Extension and Service Center, 1997. Handling of Plant Quarantine Objects.
2. Song Ziqing et al., 1993. Plant Quarantine, pp. 67.