Pak J Biol Sci. 2021 Jan;24(9):928-938. doi: 10.3923/pjbs.2021.928.938.
<b>Background and Objective:</b> <i>Monacha obstructa</i> has a serious harmful impact as agricultural pest infested field crops, fruits, vegetables and ornamental plants nurseries in multiple Egyptian governorates. The objective of this research was estimating the population dynamic of the terrestrial gastropod species <i>Monacha obstructa</i> (Pfeiffer) (Hygromiidae) on two economic crop fields and its correlation with temperature degree and relative humidity, the level of infestation on other economic crops had been estimated as well. <b>Materials and Methods:</b> This study was conducted in three sites in Fayoum governorate, 1) Forkous village at Tamiya District, 2) Dar Ramadsite including the Experimental farm and research station of the Faculty of Agriculture, Fayoum University, Fayoum District and 3) Feedimeen village at Sannoris District. The distribution and population dynamics of <i>Monacha obstructa</i> were assessed as one of dominant species on two field crops Egyptian clover <i>Trifolium alexandrinum </i>L. and wheat <i>Triticum aestivum</i> L. at Forkous village, Tamiya District and Dar Ramad site, Fayoum District, during two successive seasons 2016/2017 and 2017/2018. <b>Results:</b> Majority of the examined crops in the sites were found with heavy infestation of this species, while the two species <i>Cochlicella acuta</i> (Müller) (Geomitridae) and <i>Massylaea vermiculata </i>(Müller) (Helicidae) recorded in December, 2017 and in January, 2018, respectively, on mango trees in Feedimeen at Sannoris district for only one time. High density of <i>M. obstructa</i> recorded on Egyptian clover more than wheat at Forkous village and Dar Ramad site for the both seasons in this study. <b>Conclusion:</b> Results concluded that <i>Monacha obstructa</i> has a serious harmful impact as agricultural pest infested field crops, fruits, vegetables and ornamental plants nurseries in Forkous village and Dar Ramad site, respectively.
<b>背景和目的：</b><i>Monacha obstructa</i>作为农业害虫，严重危害了埃及多个省的田间作物、水果、蔬菜和观赏植物苗圃。本研究的目的是评估两种经济作物田地上陆生腹足纲物种<i>Monacha obstructa</i>（Pfeiffer）（Hygromiidae）的种群动态及其与温度和相对湿度的相关性，同时还评估了其他经济作物上的虫害水平。<b>材料和方法：</b>本研究在法尤姆省的三个地点进行，1）塔米亚区福库斯村，2）法尤姆大学农学院达兰马德试验区和研究站，法尤姆区，3）萨诺里斯区费德米恩村。在塔米亚区福库斯村和法尤姆区达兰马德试验区，评估了<i>Monacha obstructa</i>作为两种主要作物（埃及三叶草<i>Trifolium alexandrinum </i>L. 和小麦<i>Triticum aestivum</i> L.）上的优势物种之一的分布和种群动态。在 2016/2017 和 2017/2018 两个连续季节中。<b>结果：</b>在这些地点的大多数检查作物中，发现该物种严重受其侵害，而 2017 年 12 月和 2018 年 1 月，在萨诺里斯区费德米恩村的芒果树上，仅发现了一次<i>Cochlicella acuta</i>（Müller）（Geomitridae）和<i>Massylaea vermiculata </i>（Müller）（Helicidae）两种物种。在本研究中，福库斯村和达兰马德试验区，小麦上的<i>M. obstructa</i>密度均高于三叶草。<b>结论：</b>结果表明，<i>Monacha obstructa</i>在福库斯村和达兰马德试验区都对田间作物、水果、蔬菜和观赏植物苗圃造成了严重的农业害虫危害。
