Department of Agriculture and Fisheries Convergence, Korea National University of Agriculture and Fisheries, Jeonju-Si, Republic of Korea.
Department of Environmentally Friendly Agriculture, Chungnam Agricultural Research and Extension Services, Yesan-Si, Republic of Korea.
PLoS One. 2024 Apr 16;19(4):e0301471. doi: 10.1371/journal.pone.0301471. eCollection 2024.
An invasive species, Pochazia shantungensis (Hemiptera: Ricaniidae), causes serious economic damage to fruit trees. In Korea, this pest is mainly managed using chemical insecticides. However, the management timing and insecticides for P. shantungensis negatively affect honeybee populations. Thus, this study estimated the decision-making level for P. shantungensis in persimmons to decrease insecticide application and increase management efficiency. We determined which developmental stage (i.e., egg, nymph, and adult) affected the damage-related factors (numbers of new shoots and fruit formations, and harvest amount) of persimmons using both spatial analyses and linear relationships. The distribution of P. shantungensis eggs was spatially correlated with the one of persimmon fruit number. However, we did not find any linear relationships between the densities of P. shantungensis eggs and damage-related factors of persimmons. Instead, we found that the density of P. shantungensis correlated with the death of oviposited branches. From the developed model of branch death possibility based on egg mass density, 5.75 egg masses per newly developed branch were proposed as the decision-making level. The findings would help increase the efficiency of P. shantungensis management in persimmon orchards and develop decision-making levels for other insects.
一种入侵物种，山东六点蓟马（半翅目：蓟马科），对果树造成严重的经济损失。在韩国，这种害虫主要通过化学杀虫剂进行管理。然而，对山东六点蓟马的管理时机和杀虫剂的使用会对蜜蜂种群产生负面影响。因此，本研究旨在确定减少杀虫剂使用量并提高管理效率的决策水平。我们使用空间分析和线性关系来确定卵、若虫和成虫等不同发育阶段对柿子的与损害相关的因素（新梢和果实形成数量以及收获量）的影响。山东六点蓟马卵的分布与柿子果实数量的分布具有空间相关性。然而，我们没有发现山东六点蓟马卵密度与柿子损害相关因素之间存在任何线性关系。相反，我们发现山东六点蓟马的密度与产卵枝条的死亡有关。基于卵量密度，我们建立了枝条死亡可能性的模型，提出每根新发育的枝条上有 5.75 个卵块作为决策水平。研究结果将有助于提高柿子园山东六点蓟马管理的效率，并为其他昆虫制定决策水平。
