Epigeic spiders (Araneae) were surveyed in apple orchards under different farming practices (organic and conventional) in Muju-gun, Jeollabuk-do, Korea. The study was conducted from April to October in 2013 with 2 weeks interval using pitfall traps. Collected spiders were identified as 20 species of 6 families from 819 individuals in organic orchardⅠ, 19 species of 10 families from 759 individuals in orchardⅡ and 16 species of 8 families from 209 individuals in conventional orchard for from 1,787 captured spiders. Biodiversity was analyzed with species richness, abundance and Shannon diversity index (H΄). Species richness was statistically higher in organic orchard than in conventional orchard. Organic orchardⅡ comprised the greatest abundance followed by organic orchard and conventional. But species diversity was the highest in organic orchardⅡ, intermediate in conventional orchard and the lowest in orchardⅠ. Lycosidae was the most dominant family in all orchards regardless farming practices. However, Linyphiidae dominated in organic orchards only. The most dominant species were Erigone koshiensis (Linyphiidae) in organicⅠ, Pardosa laura (Lycosidae) in organicⅡ and Arctosa pungcheunensis (Lycosidae) in conventional orchard.

• Jae Seong Im(Entomology program, Department of Agricultural Biotechnology, Seoul National University)
• Seung Tae Kim(Research Institute for Agriculture and Life Sciences, Seoul National University)
• Sue Yeon Lee(Research Institute for Agriculture and Life Sciences, Seoul National University)
• Jong Kook Jung(Entomology program, Department of Agricultural Biotechnology, Seoul National University)
• Sun Kyung Lee(Entomology program, Department of Agricultural Biotechnology, Seoul National University)
• Byung In Son(Entomology program, Department of Agricultural Biotechnology, Seoul National University)
• Joon-Ho Lee(Entomology program, Department of Agricultural Biotechnology, Seoul National University, Research Institute for Agriculture and Life Sciences, Seoul National University)