杉木炭疽病的研究——Ⅲ.病害流行

<正>由Glomerella cingulata引起的杉木炭疽病在江西省丘陵地区广泛流行。病害在4月上旬开始发生,4月下旬至5月下旬,当旬平均气温上升至20—25℃时,病害迅速发展达到高峰。6月下旬以后基本上停止发展。秋季,只有患生理性黄化病的杉木才会发病。降雨和大气湿度对病害的流行无显著影响。

STUDIES ON THE ANTHRACNOSE OF CHINESE FIRIII. Epiphytotics of the Disease

These studies on epiphytotics of Chinese fir anthracnose (Glomerella ciugulata) were carried out in Jiangxi Province of China during 1974-1975. The disease began to make its appearence at the beginning of April and developed rapidly from late April to late May when the average temperature of ten days rose to 20~25℃. Rainfall and relative humidity likely had little to do with it. Experiments of inoculation with conidium suspension spraying showed that the incubation period ranged from 8 to 17 days and the light deficiency favored the infection. In autumn, only new shoots with chlorosis were infected.The main factor for the epiphytotics of the disease seems to be the unfavorable site conditions for the development of the young Chinese fir, since this disease is of little significance in the native regions of Chinese fir.