Division of Forest Insect Pests and Diseases, National Institute of Forest Science, Dongdaemun-gu, Seoul, Republic of Korea.
Department of Environmental Science and Ecological Engineering, Graduate School, Korea University, Seongbuk-gu, Seoul, Republic of Korea.
J Econ Entomol. 2019 Mar 21;112(2):720-728. doi: 10.1093/jee/toy355.
Korean oak wilt (KOW) is vectored by the beetle Platypus koryoensis (Murayama) (Coleoptera: Curculionidae), a native species of Korea, whose dispersal distance is a key factor determining the spread of damage by KOW. To estimate dispersal distance at stand level, we conducted a mark-release-recapture (MRR) experiment and validated its results using an independent data. Sticky traps were attached to the trunks of oak trees up to 48.8 m from the release point. Beetles were marked with different three fluorescent powders by date and released, and the number of recaptured beetles was counted 90 min after release. To validate the flight distance, annual mean dispersal distance of P. koryoensis population was analyzed using GPS coordinates of oak trees with the symptom of KOW recorded in the field from 2012 to 2014 in independent oak stands that have been damaged by KOW since 2012. The beetles were recaptured only on the day they were released, suggesting that the beetles only make one flight. The percentage of recaptured beetles was 6.0 ± 1.6%. The mean dispersal distance was 18.0 ± 1.3 m, and more than 85% of recaptured beetles were caught within 25 m. Annual movement distances in infested stands were 24.1 and 19.9 m from 2012 to 2013 and 2013 to 2014, respectively, similar to the dispersal distance obtained from our MRR experiment. Our results showed that the dispersal distance of P. koryoensis estimated by MRR is a useful process for predicting the spread of areas damaged by KOW.
韩国橡树萎蔫病（KOW）由甲虫 Platypus koryoensis（Murayama）（鞘翅目：象甲科）传播，该甲虫是韩国的本地物种，其扩散距离是决定 KOW 损害传播的关键因素。为了估计林分水平上的扩散距离，我们进行了标记释放再捕获（MRR）实验，并使用独立数据验证了实验结果。在离释放点 48.8 米范围内的橡树树干上系上粘性陷阱。根据日期和释放点用不同的三种荧光粉标记甲虫，并在释放后 90 分钟统计回收的甲虫数量。为了验证飞行距离，我们分析了 2012 年至 2014 年在已受 KOW 破坏的独立橡树林中记录的 KOW 症状的橡树的 GPS 坐标，以验证 P. koryoensis 种群的年平均扩散距离。在释放当天仅捕获到甲虫，表明甲虫仅进行一次飞行。回收甲虫的比例为 6.0±1.6%。平均扩散距离为 18.0±1.3 米，超过 85%的回收甲虫在 25 米以内捕获。2012 年至 2013 年和 2013 年至 2014 年，受感染林分的年移动距离分别为 24.1 和 19.9 米，与我们的 MRR 实验获得的扩散距离相似。我们的结果表明，MRR 估计的 P. koryoensis 扩散距离是预测 KOW 损害传播范围的有用过程。
