This study was conducted to compare the community structure and biodiversity of epigeic spiders between pear fields cultivated by integrated pest management (IPM) and organic methods. This is the first study of this kind to be conducted in Korea. Eighty-four spider species from 22 families were identified among the collected 2,489 arthropods, with 754 individuals being sampled from IPM fields and 1,735 individuals from organic fields. Generally, Theridiidae, Linyphiidae, Lycosidae, Agelenidae, Gnaphosidae, and Salticidae were the dominant spider families in the pear orchard regardless of the farming methods, and species richness and abundance were higher in organic fields than in IPM fields. The dominant species were the wolf spiders (Lycosidae) and stone spiders (Gnaphosidae), and their cumulative abundance was 70.7% in IPM fields and 72.7% in organic fields. The community structure between organic and IPM fields was heterogeneous, with a 45% similarity level. Biodiversity, species richness, abundance, and species diversity index were higher in organic fields than in IPM fields, and significantly different between the farming methods. Seasonal fluctuations in biodiversity were similar in both IPM and organic fields. The species richness and species diversity index increased and the abundance decreased in the second half of the cultivation period. This study on the community structure and biodiversity of epigeic spiders, which form one of the most important predator groups, will provide principal ecological and faunistic information required to maintain the biodiversity of useful arthropods in agricultural ecosystems and help implement sustainable agriculture based on the active use of natural enemies.

Ⅰ. Introduction
Ⅱ. Materials and Methods
    1. Study sites
    2. Sampling and identification of spiders
Ⅲ. Results
Ⅳ. Discussion
References

• Song Jang-Hoon(Pear Research Station, National Institute of Horticultural & Herbal Science) | 송장훈
• Seo Ho-Jin(Pear Research Station, National Institute of Horticultural & Herbal Science) | 서호진
• Im Jae-Seong(Crop Protection R&D Center, FarmHannong Co., Ltd) | 임재성
• Choi Eu-Ddum(Pear Research Station, National Institute of Horticultural & Herbal Science) | 최으뜸
• Kim Seung-Tae(Life and Environment Research Institute, Konkuk University) | 김승태 Corresponding author