桉树伞房属4个树种在广西的早期病害调查

本文调查分析了引自澳大利亚的桉树伞房属4个树种23个种源209个家系在广西柳州试验点遭受桉树Quambalaria顶梢与白叶枯萎病病害情况.4个引进树种中斑皮桉和大叶斑皮桉受害最为严重,感染率分别达99.2%和97.9%;柠檬桉和斑皮柠檬桉总体抗性表现较好,感病率为63.2%和72.4%.4个树种易感病的特性和适宜的降雨环境,是病害集中爆发的主要原因.对伞房属4个树种的下一步研究应注重于抗病种源、家系的选育.

Investigation of Leaf and Stem Diseases on Four Corymbia Species in Guangxi

This paper reports on the investigation of the incidence of stem wilt and leaf blight pathogens, primarily Quambalaria pitereka, on 209 families representing 23 provenances of 4 species from the genus Corymbia, imported from Australia, that were growing in Guangxi. Among the four species, Corymbia maculata and C. henryi were the most severely affected, with infection rates of 99.2% and 97.9% respectively. Overall resistance of C. citriodora subsp. citriodora and C. citriodora subsp. variegata was somewhat better, with the disease infection rates of 63.2% and 72.4% respectively. The morphological characteristics and natural adaptation to specific climatic environments of the four species seemed to be the main causes for disease incidence. Further studies of these four Corymbia species will need to focus on selection and breeding of provenances and families for disease resistance.