This studies was conducted to compare functional diversity of terrestrial arthropods in commercial apple orchards under conventional and organic practices. We collected terrestiral arthropods using pitfall traps in four conventional and seven organic apple orchards from April to October, 2012-2014. Sampled arthropods were identified at the species level and then classified three functional groups (detritivores, herbivores and beneficial arthropods included pollinators, parasitoids and predators). Biodiversity was analyzed with species richness, abundance and shannon index for each group and compared between conventional and organic orchards. In results, species richness of detritivores and benefical arthropods were higher in organic orchards than in conventional orchards (detritivores: t=-2.68, df=9, P=0.03; beneficial arthropods: t=-3.98, df=9, P=0.003). Organic orchards showed significant difference at abundance of beneficial arthropods (t=-3.33, df=9, P=0.008) and higher shannon index at detritivores (t=-2.36, df=9, P=0.04) than conventional orchards. However, all biodiversity indices of herbivores were not significantly different between conventional and organic orchards at 95% confidence level.

• Jae Seong Im(Entomology program, Department of Agricultural Biotechnology, Seoul National University)
• Seung Tae Kim(Life and Environmental Research Institute, Konkuk University)
• Sun Kyung Lee(Entomology program, Department of Agricultural Biotechnology, Seoul National University)
• Sue Yeon Lee(Research Institute of Agricultural and Life Sciences, Seoul National Unviersity)
• Jong-Kook Jung(Division of Forest Insect Pests and Diseases, National Institute of Forest Science)
• Joon-Ho Lee(Entomology program, Department of Agricultural Biotechnology, Seoul National University, Research Institute of Agricultural and Life Sciences, Seoul National Unviersity)