2019년부터 2023년까지 제주도와 전라남도에서 재배되는 바나나(banana, Musa acuminate × balbisiana)와 커피(coffee, Coffea arabica)에 발생하여 피해를 주는 해충을 조사하였다. 바나나에서 발생한 해충은 총 7종이 조사되었다. 차응애(Tetranychus kanzawai)는 대부분의 바나나 과 원에서 발견되었고, 매년 잎에서 고밀도로 발생하여 피해를 주었다. 귤가루깍지벌레(Planococcus citri), 담배거세미나방(Spodoptera litura), 차애모 무늬잎말이나방(Adoxophyes honmai) 순으로 돌발적으로 발생하여 주로 잎을 가해하였다. 과실을 가해하는 해충은 없었으나, 2022년도 제주도에 서 바나나 과실 표면에 흰색 실무늬나 녹슨 색으로 변색되는 피해를 유발하는 고사리그물총채벌레(Helionothrips femoralis)가 처음 발견되었고, 2023년에 전라남도 완도와 해남에 소재한 바나나 농가에서도 이 해충이 발생하는 것이 확인되었다. 커피에 발생한 해충은 총 5종이 조사되었다. 이중 탱자소리진딧물(Toxoptera aurantii), 귤가루깍지벌레, 차애모무늬잎말이나방순으로 매년 다량 발생하여 피해를 주었다. 전라남도 소재 농가 에서는 달팽이종류인 두줄민달팽이(Limax marginatus)가 일부 잎과 과실에 피해를 주기도 하였고, 미국선녀벌레(Metcalfa pruinosa)가 일부 나무 에서 발생하기도 하였다.

Since the importance of integrated pest management to minimize environmental damage and maximize pest control effectiveness has emerged, efforts to put it into practice have continued. To implement IPM, it is necessary to estimate the economic injury level to determine the control method by identifying pests and weeds that damage the quantity and quality of crops in the field, investigating the occurrence level, and calculating the ratio of cost and effectiveness. Also, damage to host plants caused by increased density of insect pests appears to change plant’s health that key factor for managing crops. Therefore, understanding the relationship between the density of pests and the damage to the host plants is necessary. This study aims to analyze the causal relationship between the density of insect pests and damage to the host plants for estimating the economic injury level of insect pests on the host plants and investigating the possibility of pest control decision-making using plant health status.

Amur silver grass, Miscanthus sacchariflorus is one of the promising biofuel crops. A damage of noctuid pest, Leucapamea askoldis was firstly observed from Amur silver grass in Hwasun silver grass plantation during the survey of insect pests of Amur silver grass in Iksan, Hwasun, and Sancheong plantation areas in Korea. The host of L. askoldis was not known yet in Korea. Thus, M. sacchariflorus was the first known host in Korea. The L. askoldis damage was observed as larval feeding on newly grown shoots of M. sacchariflorus close to soil surface from early April to early May in 2013. Investigated larval density was 1.6 ± 1.1 per m2 on April 4 and damage rate of shoots was 0.8% ± 0.4 per hundred plants on May 4, 2013. The larvae bore into shoots of M. sacchariflorus and then feed inside of plant. The damaged shoots are easily pulled out and distinguished by the boring hole on the shoots.