Major Host Plant and Life Cycle of Pest in Arboretum of Chonnam National University

Investigation was made during 2018 to 2020. Among the pests occurring in arboretum, the life cycle of the fall webworm (Hyphantria cunea Drury), spotted lanternfly (Lycorma delicatula), and Ricaniid plantthopper (Ricania shanthungensis) were further investigated for their life cycle in the field. 1. The fall webworm damaged 20 out of the 45 tree species investigated. Among them persimmon tree, naksanghong, yangpala tree, cherry tree, and mulberry tree were most severly damaged. 2. Field observation of the fall webworm made on a mulberry tree showed that first generation adults emerged in mid/late May and oviposited from late May to early June. Larvae occurs during early June and late July, damaging a diverse kind of tree leaves, forming webs. In second generation adult emergence and egg deposition occurs during mid-July and mid-August. Overwintering larvae were observed inside the bark after eating from early August to late October. 3. Spotted lanternfly damaged eight out of 45 tree investigated. Among them tree of heaven, chinaberry tree and oak were severely damaged. Field observation on chinaberry tree made from the end of May showed that 1st-3rd instar nymphs began to appear from mid-June, 4th-5th instar nymphs, which have characteristic red color were discovered, and adults began to appear in early July, with the trend of increase until the end of August. From September, adults moved to the upper layer and deposited eggs as mass uniformly. 4. Ricaniid plantthopper damaged 29 of the 45 tree species. Among them, cornflower, camellia, cherry, red thorn, and korea winter hazel were the most damaged species. When observed on camellia as a host the 2nd-3rd instar nymphs of the ricaniid plantthopper began to appear from the end of May, adults were found during mid- and late June, eggs were deposited from early and mid September. During early and mid-November, overwintering eggs were often observed.