Spodoptera exigua Hübner and Sesamia cretica Led. (Lep., Noctuidae) are two important pests of corn. In this study, the effect of weed bands in the corn field, as weedy culture, on population density and damages of the pests were evaluated during two growing seasons (2016/2017). Cumulative insect days (CID) of each lepidopteran pest in weedy culture were compared with non-weedy culture. Results showed that CIDs of S. exigua and S. cretica in the non-weedy corn culture were significantly higher than the weedy corn culture. There was no significant difference between the total yield in the weedy and non-weedy cultures. Also, determinations of spatial distributions of the pests in the weedy and no-weedy treatments using Taylor's power law (TPL) and Iwao's patchiness (IP) showed that TPL provides a better fit for the data than IP and spatial distributions of both pests on both cultures were aggregative. Moreover, minor differences were observed between spatial distribution parameters of the pests in the weedy and non-weedy cultures. Green's model was used for developing a fixed-precision sequential sampling plan of the pests on the weedy and no-weedy treatments. Optimum sample sizes of S. exigua ranged from 532 to 5370 and 428 to 5296 plants and S. cretica varied from 297 to 2040 and 43 to 186 plants in the non-weedy and weedy cultures based on the desired precision level (0.25–0.1). Estimated stop lines of non-weedy and weedy cultures for S. exigua ranged from 0.000057 to 52.59 and 0.00029 to 58.87 and for S. cretica ranged from 1.59 to 111.5 and 2.09 to 98.03 larval cumulative numbers, respectively (0.25–0.1). The performance of the sampling plan was validated by resampling analysis using RVSP software. Results of the study can be used in the integrated pest management program of corn fields.

中文翻译：

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杂草栽培对玉米田草地贪夜蛾和黑芝麻(Lep., Noctuidae)种群密度、空间分布和取样程序的影响

草地贪夜蛾胡布纳和芝麻引领。（Lep.，Noctuidae）是玉米的两种重要害虫。在本研究中，在两个生长季节（2016/2017 年）评估了玉米田中杂草带作为杂草栽培对种群密度和害虫危害的影响。将杂草培养中每种鳞翅目害虫的累积昆虫天数（CID）与非杂草培养进行比较。结果表明，CIDs西瓜和S. cretica在非杂草玉米栽培中明显高于杂草玉米栽培。杂草和非杂草培养物的总产量之间没有显着差异。此外，使用泰勒幂定律 (TPL) 和岩尾斑块 (IP) 确定杂草和无杂草处理中害虫的空间分布表明，TPL 比 IP 和两种害虫的空间分布更适合数据文化是聚合的。此外，杂草和非杂草培养物中害虫的空间分布参数之间存在细微差异。格林模型被用于制定除草和无杂草处理害虫的固定精度顺序抽样计划。最佳样本量西瓜范围从 532 到 5370 和 428 到 5296 个植物和S. cretica根据所需的精度水平（0.25-0.1），非杂草和杂草培养物中的植物从 297 到 2040 和 43 到 186 株不等。非杂草和杂草培养的估计停止线西瓜范围从 0.000057 到 52.59 和 0.00029 到 58.87 和S. cretica范围分别为 1.59 至 111.5 和 2.09 至 98.03 幼虫累积数（0.25-0.1）。通过使用 RVSP 软件进行重新抽样分析，验证了抽样计划的性能。研究结果可用于玉米田病虫害综合治理计划。