40个苜蓿品种对炭疽病的苗期抗性评价

三叶草炭疽菌(Colletotrichum trifolii)是引起苜蓿炭疽病的重要致病菌，发生严重时可导致苜蓿毁灭性危害。采用孢子悬浮液喷雾接种法，以发病率和病情指数为指标，对40个苜蓿品种开展抗三叶草炭疽菌的苗期抗性评价。结果表明，供试品种中，威纳尔、阿尔冈金、巨能2表现高抗，WL363HQ、巨能7、拉迪诺、4030、4010、润布勒、亮牧表现中抗，新牧4号、甘农4号、驯鹿等15个品种表现中感，新疆大叶、甘农6号、甘农9号等15个品种表现高感。抗性品种占供试品种的25%，感病品种占75%，高抗与高感品种间抗性差异显著(P < 0.05)。

Evaluation of resistance to Colletotrichum trifolii in seedlings of 40 alfalfa cultivars

Colletotrichum trifolii is an important pathogen that causes anthracnose in alfalfa. In severe cases, it can cause devastating damage to alfalfa crops. A spore suspension spray inoculation method was used to evaluate seedling resistance to C. trifolii in 40 alfalfa cultivars, using incidence and disease index as indicators. Among the tested cultivars, Magnum 2, Vinal, and Algonquin showed high resistance, and WL363HQ, Magnum 7, Ladinuo, 4030, 4010, Rembler, and Liangmu, showed moderate resistance. Fifteen cultivars, including Xinmu No.4, Gannong No.4 and Xunlu showed moderate susceptibility, and 15 cultivars, including Xinjiang Daye, Gannong No.6, and Gannong No.9 showed high susceptibility. Twenty-five percent of tested cultivars displayed resistance. Seventy five percent of cultivars were susceptible. There was a significant difference in resistance between highly resistant and highly susceptible cultivars (P < 0.05).