安徽省水稻区试品种(系)对稻曲病的抗性鉴定及评价

Identification and evaluation of resistance in rice varieties to false smut in Anhui Province

在安徽省潜山县分3个播期对120个水稻区试品种进行稻曲病自然诱发鉴定,采用发病率的平均值与最大值以及病情指数的平均值与最大值对鉴定结果作了分析比较。结果表明:水稻品种间对稻曲病的抗性有显著差异,不同播期间的病情指数也有明显差异,早播的发病轻,后两个播期发病重。以最大值评价水稻品种对稻曲病的抗性更可靠。一般情况下,可用病穗率最大值评价品种抗性,如需更精确的评价,则以病情指数最大值作为评价标准为宜。

Resistance of 120 rice varieties from regional trials to rice false smut was tested with three sowing stages in the natural nursery in epidemic area, Qianshan County, Anhui Province. The data were evaluated by average value and maximum value of disease incidence and disease index. The results showed that there was significant difference among varieties and also among sowing stages. It was more credible for the resistance judged by maximum disease incidence or maximum disease index. In normal case, maximum disease incidence was enough to judge the resistance of rice varieties, but for accurate judgment, maximum disease index should be used.