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›› 1981, Vol. 17 ›› Issue (2): 183-188.

• 论文及研究报告 • 上一篇    下一篇

杨树溃疡病的发生发展规律

景耀 杨俊秀   

  1. 西北林学院
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1981-05-25 发布日期:1981-05-25

STUDIES ON THE DEVELOPMENT OF DOTHIORELLA CANKER OF POPLAR

Jing Ya, Yang Jun-xiu   

  1. Northwest College of Forestry
  • Received:1900-01-01 Revised:1900-01-01 Online:1981-05-25 Published:1981-05-25

Abstract: Dothiorella gregaria Sacc. Attacked poplars severely. The canker disease distributed widely in China. Usually, the disease forms blister-type patches and cankers on the stems and branches of poplar, and may yet cause dieback and kill adult trees in a few years.The disease starts in early of May, and reaches its high peaks of occurrence twice in the year, i. e. the first peak comes in July, and the second in September. The pathogen overwinters from November up to next April. The mycelia hibernate in the old disease patches and become the primary sources of infection.A temperature of 18—25℃, and a relative humidity above 80% will be favourable for development of the disease. As mentioned above, the optimum tempereture and relative humidity were the main enviromental factors which influenced the development of this epidemic.The fungus has a wide hostrange. There is a significant difference on the resistance and susceptibility among poplar species. Poplus usbekistanica cv. 'Afghanica', and P. pyramidalis×P, berolinensis are severely susceptible; P. 'Pekinensis', P. usbekistanica cv. 'Afghanica'×hopeinsis P. simonii are middle; and P. tomentosa, P. pyramidalis, P. alba cv. Pyramidalis, P. 'Opera', P. dakuanensis, P. euramericana cv. 'Robusta', P. euramericana cv. 'Marilandica', poplar 15A (Populus sp.), P. euramericana cv. 'Gelrica' are lightly suscepitable; and P. euramericana (P. canadensis), P.×euramericana cv. 'Regenrata', P. pyramidalis×nigra, and so on are resistant.