708-11 Network Analysis by Crops for Crop Rotation and on the Relationships between Pests and their Natural Enemies in Organic Farming in Korea.

Wednesday, 8 October 2008
George R. Brown Convention Center, Exhibit Hall E
WooHyun Kim, YoungMan Yoon, Dea-Yeon Kim, Namin Koo and Jeong-Gyu Kim, Div. Environ. Sci. & Ecological Eng., Korea University, Seoul, South Korea
This study aims to analyze domestic organic farming system. It is also focused on the network analysis of crops for crop rotation and on the relationships between pests and their natural enemies. Literature survey of crop rotation, various types of pest in farmland and their natural enemies were also conducted. Collected data were compiled and analyzed with Network analysis program. In this study, we have shown that weed and pest control related techniques took up large portion in 69 kinds of element technique. After conducting network analysis with 51 different species of crop which are applicable to crop rotation, high connectivity of rice plant, corn, sesame and bean was confirmed. On the other hand, network analysis result with the field data showed crop rotation network in field was created rye-centered crop. In the pest - natural enemy network analysis, 139 species of insect which are affecting to crop growth and 36 species of natural enemies are founded. 77 species of pest didn't have any connections with natural enemies. This result represents that either those 77 pests are not researched for controlling with natural enemy or there are no known natural enemies for those pests. Harmonia axyridis (Ladybird beetles) and Chalcidoidea are the major role of pest-natural enemy network.