The efficacy of different control techniques against the large black chafer, Holotrichia parallela Motschulsky (Coleoptera: Scarabaeidae), in organic pear (Pyrus pyrifolia) orchards was evaluated. In this study, field trials were conducted in three locations in Korea—Naju, Hampyeong, and Boseong—to evaluate different techniques to suppress these beetles. Pheromone traps, bio-insecticides (Hongmengye and Melchungdaejang), and a combination of the two were applied as treatments. In Naju, Hampyeong, and Boseong, the highest number of adult H. parallela were caught in the control plots (n=45, n=39, and n=20, respectively), while the fewest were caught in the pheromone plus bio-insecticide plot (n=19) in Naju and in the combined treatment plot in Hampyeong (n=10). In Naju, the greatest leaf damage was observed in the control (66%), and in all locations (Naju, Boseong, and Hampyeong), the least damage occurred in the combined treatment plots (42%, 36%, and 24%, respectively). Regarding the tree canopy, the greatest leaf damage was observed in the upper canopy, and less damage was observed in the lower canopy. These results demonstrate that the combination of sex pheromone traps and bio-insecticides can be used to manage H. parallela in organic pear orchards.

Ⅰ. Introduction
 Ⅱ. Materials and Methods
  1. Field experiments
  2. Statistical analyses
 Ⅲ. Results and Discussion
  1. Results and Discussion
 Ⅳ. Conclusions
 References

• Song, Jang-Hoon(Pear Research Institute, National Institute of Horticultural & Herbal Science) | 송장훈
• Md, Abdul Alim(Department of Entomology, Hajee Mohammad Danesh Science and Technology University) | 압둘알림
• Choi, Eu-Ddeum(Pear Research Institute, National Institute of Horticultural & Herbal Science) | 최으뜸
• Seo, Ho-Jin(Pear Research Institute, National Institute of Horticultural & Herbal Science) | 서호진 Corresponding author