This study aimed to develop and validate a standard area diagram set (SADs) to estimate the severity of eyespot of rice caused by Drechslera gigantea . For this purpose, a SADs with seven levels of severity (0.3; 1.0; 3.0; 5.0; 10; 15; and 21%) was established. The SADs was validated by 16 raters with no experience in evaluating plant diseases. Both accuracy and precision improved when they used the SADs. The statistical parameters for the 16 raters were: bias coefficient factor - C b (no SADs = 0.404, with SADs = 0.994); correlation coefficient - r (no SADs = 0.884, with SADs = 0.953); and Lin’s concordance correlation coefficient - ρc (no SADs = 0.356, with SADs = 0.947). In addition, estimates were more reliable: inter-rater coefficient of determination - R 2 (no SADs = 0.712, with SAD = 0.873); intra-class correlation coefficient - ρ (no SADs = 0.723, with SADs = 0.924). The SADs proposed here is a useful tool for improving visual assessments of eyespot severity of rice.

中文翻译：

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一种用于水稻眼斑严重程度评估的标准面积图集

本研究旨在开发和验证标准面积图集 (SADs) 来估计由 Drechslera gigantea 引起的水稻眼斑的严重程度。为此，建立了具有七个严重性级别（0.3；1.0；3.0；5.0；10；15；和 21%）的 SAD。SAD 由 16 位没有评估植物病害经验的评估者验证。当他们使用 SAD 时，准确性和精确度都得到了提高。16 位评分者的统计参数为：偏差系数因子 - C b（无 SAD = 0.404，SAD = 0.994）；相关系数 - r（无 SAD = 0.884，SAD = 0.953）；和 Lin 的一致性相关系数 - ρc（无 SAD = 0.356，SAD = 0.947）。此外，估计值更可靠：评分者间决定系数 - R 2（无 SAD = 0.712，SAD = 0.873）；类内相关系数 - ρ（无 SAD = 0.723，SAD = 0.924）。此处提出的 SAD 是一种有用的工具，可用于改进对水稻眼斑严重程度的视觉评估。