Abstract: The present study aimed to analyze an early epidemic anthracnose case in a Chinese fir (Cunninghamia lanceolata) third-generation seed orchard (2 hm²) of Guangdong. The results indicated that the anthracnose occurred over the first two years (2016—2017) with little impact on the health of the seed orchard. In 2018 (the seed orchard was two and half years old), the anthracnose had a breakout and greatly impacted the seed orchard leading to 42.5% of the grafted plantlets suffering an anthracnose disease. Regarding the clonal infection rate in 2018, it was found that different breeding parents (n=56) expressed a different resistance abilities to anthracnose with an infection rate ranging from 9.1% to 81.8%. Five breeding parents, including cx731, cx841, cx859, cx872, cx876, were preliminarily proved to be resistant to anthracnose at a relatively high level. These parents were important materials for the Chinese fir anthracnose-resistance breeding programs.

Key words: Chinese fir, seed orchard, parents, anthracnose, disease resistance

摘要： 针对广东省杉木第3代种子园建设早期一处小型园区(2 hm²)自然发生的炭疽病害跟踪监测其流行情况。建园后前两年(2016～2017年)均有炭疽病害发生，但对种子园影响不大；建园后2.5年时(2018年)，种子园炭疽病发病事件增多，42.5%嫁接株出现炭疽病症，炭疽病对种子园母株健康影响较大。于发病率较高龄期(2.5年生)调查不同亲本嫁接无性系的感病情况，发现不同亲本(n=56)抗炭疽病能力差异较大(感病率9.1%～81.8%)。根据感病率，初步确定其中5个亲本(cx731、cx841、cx859、cx872、cx876)具有较强的抗炭疽病能力，这些亲本是开展杉木抗炭疽病育种研究的重要候选材料。

关键词: 杉木, 种子园, 亲本, 炭疽病, 抗病性