Abstract. Cotton root rot (CRR) is a persistent soil-borne fungal disease that is devastating to cotton crops in certain fields, predominantly in Texas. Research has shown that CRR can be prevented or mitigated by applying fungicide during planting, but fungicide application is expensive. The potentially infected area within a field has been shown to be consistent, so it is possible to apply the fungicide only at locations where CRR exists, thus minimizing the amount of fungicide applied across the field. Previous studies have shown that remote sensing from manned aircraft is an effective means of delineating CRR-infected field areas. In 2015, an unmanned aerial vehicle was used to collect high-resolution remote-sensing images in a field known to be infected with CRR. A method was developed to produce a prescription map (PM) from these data, and in 2017, fungicide was applied based on a PM derived from the 2015 image data. The results showed that the PM reduced the fungicide applied by 88.3%, with a reduction in CRR area of 90% compared to 2015. A simple economic model suggested that it is generally better to treat an entire CRR-infested field rather than leaving it untreated, and application based on a PM becomes preferable as the size of the farm and the yield increase while the CRR-infestation level and the number of fields on the farm decrease.

中文翻译：

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无人机遥感描绘棉花根腐病

摘要。棉花根腐病 (CRR) 是一种持久的土传真菌病害，对某些领域的棉花作物具有破坏性，主要在德克萨斯州。研究表明，在种植期间施用杀菌剂可以预防或减轻 CRR，但施用杀菌剂的成本很高。一个田地内的潜在感染区域已被证明是一致的，因此可以仅在存在 CRR 的位置使用杀菌剂，从而最大限度地减少整个田间的杀菌剂用量。先前的研究表明，有人驾驶飞机的遥感是划定受 CRR 感染的现场区域的有效手段。2015 年，一架无人机被用于在已知感染 CRR 的领域收集高分辨率遥感图像。开发了一种方法来根据这些数据生成处方图 (PM)，2017 年，根据 2015 年图像数据得出的 PM 应用了杀菌剂。结果表明，PM 减少了 88.3% 的杀菌剂施用，与 2015 年相比，CRR 面积减少了 90%。一个简单的经济模型表明，处理整个 CRR 侵染的田地通常比不进行处理要好随着农场规模和产量的增加，而 CRR 侵染水平和农场田地数量的减少，基于 PM 的应用变得更可取。