Depto de Agronomia, Univ Federal de Viçosa, Viçosa, MG, Brasil.
Depto de Entomologia, Univ Federal de Viçosa, Viçosa, MG, Brasil.
Neotrop Entomol. 2020 Jun;49(3):445-455. doi: 10.1007/s13744-020-00761-2. Epub 2020 Feb 4.
Pest populations are mostly regulated by climate, intra- and interspecific competition, natural enemies, and host plant quality. Myzus persicae (Sulzer) (Hemiptera: Aphididae) is a widely adapted aphid in the agroecosystems and is one of the main bell pepper pests. In the present study, we determined the spatial and temporal dynamics and the regulatory factors of M. persicae populations in bell pepper crops. The number of aphids and their natural enemies were evaluated during 2 years in four commercial bell pepper fields. Myzus persicae density data were related to temperature, rainfall, and natural enemies by multiple regression analysis and were then submitted to geostatistical analysis. The density of M. persicae was higher during the plant's reproductive growth stage. Rainfall, Chrysoperla spp., and Toxomerus spp. regulate M. persicae populations. Initial infestations of this pest occur along the edges of the fields and subsequently spread towards the center. This information is useful for integrated management programs aimed at anticipating periods of higher abundance of M. persicae and identifying arthropods to be prioritized in biological control.
蚜虫种群主要受气候、种内和种间竞争、天敌和寄主植物质量调节。烟粉虱（Sulzer）（半翅目：蚜科）是农业生态系统中适应性很强的一种蚜虫，也是甜椒的主要害虫之一。在本研究中，我们确定了甜椒作物中烟粉虱种群的时空动态及其调控因素。在四个商业甜椒田进行了 2 年的蚜虫及其天敌评估。通过多元回归分析将烟粉虱密度数据与温度、降雨和天敌相关联，然后进行地统计学分析。烟粉虱的密度在植物生殖生长阶段较高。降雨、草蛉和肿腿蜂调节烟粉虱种群。这种害虫的初始侵染发生在田地的边缘，随后向中心蔓延。这些信息对于旨在预测烟粉虱丰度较高时期和确定生物防治中优先考虑的节肢动物的综合管理计划很有用。
