Xinjiang Production and Construction Corps Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization/Key Laboratory at Universities of Xinjiang Uygur Autonomous Region for Oasis Agricultural Pest Management and Plant Protection Resource Utilization, Shihezi University, Shihezi, China.
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.
PLoS One. 2018 Nov 8;13(11):e0207034. doi: 10.1371/journal.pone.0207034. eCollection 2018.
Aphids are major pests of cotton crops in the Xinjiang Uygur Autonomous Region in China, and parasitoids are considered as important natural enemies in regulating aphid populations. However, information on aphid parasitoids in the Xinjiang cotton fields is limited, which hinders the study of aphid-parasitoid interactions and the application of conservation biological control against cotton aphids. In this study, a 3-year survey was conducted in a large geographical range that included three primary cotton planting areas in southern and northern Xinjiang. The population dynamics and the parasitism levels of an assemblage of aphids in the cotton fields were investigated along with the composition of the parasitoid community associated with these aphids. Aphid parasitization varied significantly within both years and seasons, with parasitism levels ranging from 0 to 26%, indicating that there is less effective biological control of parasitoids on aphids under field conditions. Among the primary parasitoids described, Binodoxys communis (Gahan) constituted 95.19% of the parasitoid species, followed by Praon barbatum Mackauer (3.15%), Trioxys asiaticus Telenga (1.01%) and Lysiphlebus fabarum Marshall (0.65%). Significant differences were found in the composition of the primary parasitoid species between the cotton seedling period (June) and the flowering period (July-August), and two more primary aphid parasitoids were found in the seedling period. Twelve hyperparasitoid species belonging to six genera were found in our study, of which Pachyneuron aphidis (Bouché), Syrphophagus species and Dendrocerus laticeps (Hedicke) were the dominant species. The composition of the hyperparasitoid community also differed significantly between the seedling and the flowering periods. The description of this parasitoid community-associated assemblage of aphids in cotton fields will facilitate the study of aphid-parasitoid interactions and promote the development of effective cotton aphid management strategies in Xinjiang.
在中国新疆维吾尔自治区，蚜虫是棉花作物的主要害虫，寄生蜂被认为是调节蚜虫种群的重要天敌。然而，有关新疆棉田蚜虫寄生蜂的信息有限，这阻碍了对蚜虫-寄生蜂相互作用的研究以及利用保护生物防治棉蚜。在这项研究中，我们在一个包括新疆南北三个主要棉花种植区的大地理范围内进行了为期 3 年的调查。我们调查了棉田蚜虫种群的动态和聚集的寄生水平，以及与这些蚜虫相关的寄生蜂群落的组成。蚜虫的寄生率在年内和季节内差异显著，寄生率范围从 0 到 26%，这表明在田间条件下，寄生蜂对蚜虫的生物防治效果较低。在所描述的主要寄生蜂中，B. communis（Gahan）构成了寄生蜂物种的 95.19%，其次是 P. barbatum Mackauer（3.15%）、T. asiaticus Telenga（1.01%）和 L. fabarum Marshall（0.65%）。在棉苗期（6 月）和开花期（7-8 月），主要寄生蜂的组成存在显著差异，在苗期还发现了两种更多的主要蚜虫寄生蜂。在我们的研究中发现了 12 种属于 6 个属的超寄生蜂种，其中 Pachyneuron aphidis（Bouché）、Syrphophagus 种和 Dendrocerus laticeps（Hedicke）是优势种。超寄生蜂群落的组成在苗期和开花期之间也有显著差异。描述棉田与寄生蜂相关的蚜虫聚集，将有助于研究蚜虫-寄生蜂相互作用，并促进在新疆发展有效的棉蚜管理策略。
