Soybean (Glycine max) is the world's most cultivated legume. In recent years, the thrips Caliothrips phaseoli and Frankliniella schultzei (Thysanoptera: Thripidae) have caused >15% yield reduction in soybean crops. Conventional sampling plans serve as the starting point for the establishment of decision-making systems for integrated pest management (IPM) programs. These plans establish the sampling methodology, the number of samples, and the time and cost required. They must be simple, representative, accurate, fast, inexpensive, and suitable for different field sizes and plant growth stages. The objective of this research was to determine a conventional sampling plan to facilitate IPM of thrips in soybean crops. For this purpose, a 2-year study in 29 commercial soybean fields was performed to determined the best sampling technique, the optimal number of samples, and the time and cost requirements for fields of different sizes. Our sampling plan can be used for fields of different sizes, plants of different growth stages, and thrips infestations of different densities. It involves beating the apical part of 40 soybean plants per field on a white plastic tray. The time and cost of sampling ranged from 21 min and US $0.78 (1-ha fields) to 129 min and US $4.78 (100-ha fields). This sampling plan is feasible for incorporation into IPM programs because it is representative, accurate, fast, and inexpensive.

大豆 ( Glycine max ) 是世界上种植最多的豆类。近年来，蓟马Caliothrips phaseoli和Frankliniella schultzei（缨翅目：蓟马科）已导致大豆作物减产 15% 以上。常规采样计划是建立有害生物综合管理 (IPM) 计划决策系统的起点。这些计划确定了抽样方法、样本数量以及所需的时间和成本。它们必须简单、具有代表性、准确、快速、廉价，并且适用于不同的田地大小和植物生长阶段。这项研究的目的是确定一个传统的抽样计划，以促进大豆作物中蓟马的 IPM。为此，在 29 个商业大豆田中进行了为期 2 年的研究，以确定最佳采样技术、最佳样本数量以及不同规模田地的时间和成本要求。我们的抽样方案可用于不同大小的田地、不同生长阶段的植物以及不同密度的蓟马侵染情况。它涉及在白色塑料托盘上打每块田地 40 株大豆植物的顶端部分。采样的时间和成本从 21 分钟和 0.78 美元（1 公顷的田地）到 129 分钟和 4.78 美元（100 公顷的田地）不等。该抽样计划对于纳入 IPM 计划是可行的，因为它具有代表性、准确、快速且成本低廉。