【摘要】 湿地松(Pinus elliottii)幼林中松针褐斑病菌(Lecanosticta acicola)分生孢子借雨水溅落而释放和传播。当风速在1m/s左右的情况下,分生孢子从一株1.7m高的病树上被雨水溅散,约有80％降落在病树周围3.4m范围内,最远不超过8.5m,即树高的5倍。病害在林分中最初常形成发病中心,自1982年11月至1985年4月,固定观察一个标准地,发现病害自中心病株向外扩展的平均距离为8m,感病株率增长50％,感病指数增长23。病害在湿地松林中终年都有发展,以4月下旬至6月下旬发展最快,9至10月次之,这些时候的旬平均气温大约是20～25℃,旬降雨量也是一年中最多和较多的。更多还原

【Abstract】 This paper reports on the results of investigations of brown-spot needle bligt (Lecanosticta acicola) in slash pine (Pinus elliottii) plantations in the northern region of Fujian province, China. The conidia of brown-spot fungus were released and spread by the splashing of the rain. From a 1.7m high affected tree, most splashed conidia landed within the range of 0-3.4 meters, never exceeding 8.5 meters, when the wind velocity is less than 1m/s. In a slash pine plantation, from November 1982 to April 1985, the average distance of the spreading of disease from an infectious center was 8 meters, the ratio of the infected trees increased by [50% and the disease index increased by 23. The disease developed all the time from March to November, the heaviest infection occured between late April and late June, with the period of September and October coming next. The optimum temperature for disease development was 20-25°C in average for a period of ten days.更多还原