毛竹枯梢病林间流行动态的研究

据1989～1991年尤溪县东边村毛竹林定点观测结果表明,毛竹枯梢病在林间流行的时间动态应属于积年流行病害(单循环病害),逐年病菌数量递增和病害在林间扩散的速率是遵循罗辑斯蒂型规律,病株率和感病指数按2.5倍和3.4倍的速率逐年上升,一般4～5年濒临毁灭。病害流行的空间动态属于聚集分布型,发病初期有较明显的发病中心区,子囊孢子呈陡峭的扩散梯度传播,扩散的水平距离5～10m范围。病菌数量按“复利病害”逐年递增,病害在林间迅速扩散,则在初次发现零星病株就应彻底消灭。

A Study on the Epidemic State of the Top Blight of Phyllostachys heterocycla in Forests

The results of observations made on fixed spots shows that the distribution pattern of time is of a polyetic epidemic disease (monocylic dis-ease)and the disease index increased more repeatedly in accordance with the logistic model, that the spatial distribution pattern of C. phyllostachyd obeys the aggregation distribution, and that there is an obvious infection focus and the disease spreads repeatedly from the infection focus. It is proved that the control tactics of C. phyllostachyd is to put out the pathoge-ne in early stage of disease development.