为研究条锈病对不同抗性水平小麦品种的为害损失,选取了对条锈病感抗程度不同、湖北省小麦生产中主推的5个品种(兰考198,高感;扶麦368,中感;华麦1168,中感;襄麦46,中抗;鄂麦DH16,高抗)为试验材料,在田间分区种植,人工接种条锈菌,喷施不同剂量氟环唑以形成不同的发病梯度,研究了 5个品种在不同发病程度下的损失率,分析了品种抗性与植保贡献率的关系,并通过二次多项式回归分析,建立了不同抗性品种的防治阈值.结果表明,不同品种的受害损失率与病情发生程度均呈显著正相关;植保贡献率与品种抗性相关,品种抗病性越弱,植保贡献率越高;兰考198、扶麦368、华麦1168、襄麦46和鄂麦DH16的防治阈值分别为抽穗扬花期病指5.443、4.819、3.994、3.376和5.150.研究结果为利用品种抗病性防控小麦条锈病提供了理论依据.
This study aimed to evaluate the impact of stripe rust on different wheat cultivars with varying resistance levels.Five main cultivars with different resistance levels to wheat stripe rust were selected as the experimental materials in Hubei province(Lankao 198,highly susceptible;Fumai 368,moderately susceptible;Huamai 1168,moderately susceptible;Xiangmai 46,moderately resistant,Emai DH16,highly resistant).Artificial inoculation of stripe rust was carried out in the field to assess the damage caused by the disease.Different doses of fluconazole were applied to create varying incidence levels of stripe rust.The damage loss rates of five cultivars under different levels of disease incidence were studied,and the relationship between varietal resistance and plant protection contribution was analyzed.The economic thresholds for prevention and control of different resistant cultivars were established through quadratic polynomial regression analysis.The study found a significant positive correlation between the damage loss rate of different cultivars and the degree of disease occurrence.Additionally,the contribution of plant protection was correlated with the resistance of cultivars,with weaker resistance resulting in a higher contribution rate of plant protection.The economic thresholds for controlling stripe rust were determined for cultivars Lankao 198,Fumai 368,Huamai 1168,Xiangmai 46,and Emai DH16 during the heading and flowering stage,with the corresponding values of 5.443,4.819,3.994,3.376,and 5.150.These findings serve as a valuable theoretical foundation for utilizing wheat cultivars in stripe rust management.