Walnuts are economically important for forestry workers in recent, but there are few available data for insect pestsin walnut orchards. In 2017, walnut fruits and leaves were damaged by Conogethes punctiferalis and Acrocercops transecta,respectively. In late summer, damage rates by C. punctiferalis in Buyeo, Gimcheon, and Hwaseong were 22.1%, 20.5%,and 11.7%, respectively. According to A. transecta, damage rates in seedlings (58.5% in average) were higher than inolder trees (11.2% in average) irrespective of study locations.

• Jong-Kook Jung(Division of Insect Pests and Disease, National Institute of Forest Science)
• Hyeok Jun Kwon(Division of Insect Pests and Disease, National Institute of Forest Science)
• Hwang Kim(Division of Insect Pests and Disease, National Institute of Forest Science)
• Hyun-Sun Kim(Division of Insect Pests and Disease, National Institute of Forest Science)
• Sang-Tae Seo(Division of Insect Pests and Disease, National Institute of Forest Science)
• Sanghyun Koh(Division of Insect Pests and Disease, National Institute of Forest Science)