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1989年4月初,朝阳乡烟灯山发现了几十株松树枯死,4月10日再次检查,病情有所加重,发病面积达200亩左右,死亡150余株。随后,其他各地也纷纷报告松树枯死情况,据统计全区有几千亩松树感病。由于发病面积大,灾情重,根据省市领导的意见组织了松病调查组,对全区6.6万亩松林,经历了一年的普查工作。现将调查结果报告如下。 1 调查方法 采用野外实地踏查结合室内镜检、分离培养及显微摄影和气象资料的分析等。野外调查采取每100亩设置一块样地,样地面积为15×15m,记载发病地带的土壤、立地条件、林分状况、病虫害种类。按照以下标准,计算感病指数。0级—健康,Ⅰ级—枯死枝占全株枝条1/3以下,Ⅱ级—枯死枝占1/3～1/2,Ⅲ级—枯死枝占1/2～2/3;Ⅳ级—枯死枝在2/3以上或全株枯死。同时,随机采集100枚针叶,计算长蛎蚧的数量和每枚针叶上长蛎蚧最高数。 2 调查结果和分析 2.1 病害分布 经实地调查,全区发病面积6805亩,其中黑松750亩,赤松6055亩,全株死亡640株,病情指数14～58.97,干均为28.0(表1)。 赤松与黑松病情相近,黑松稍重。赤松
Early April 1989, Chaoyang Township, Smoke Hill found dozens of pine trees died again on April 10 check again, the condition worsened, the incidence of about 200 acres, more than 150 deaths. Subsequently, other parts of the country have also reported pine dying, according to statistics, the area has several thousand acres of pine flu. Due to the large area of disease and severe disaster, according to the opinions of the leaders of provinces and cities, a team of loose disease investigation was organized and the 6.6 million mu of pine forest in the whole district experienced a one-year census. The survey results are reported below. A survey method using the field field combined with indoor examination, isolation and culture and microscopic photography and meteorological data analysis. Field survey to set a piece of land for every 100 acres, sample area of 15 × 15m, record the incidence of soil, site conditions, stand status, pest species. According to the following criteria, the index of susceptibility was calculated. Grade 0 - healthy, grade Ⅰ - dead branches accounted for less than 1/3 of the whole plant branches, grade Ⅱ - dead branches accounted for 1/3 to 1/2, grade Ⅲ - dead branches accounted for 1/2 ~ 2/3; Dead branches in 2/3 or more dead or whole plant. At the same time, a random collection of 100 needles to calculate the number of long-eel oyster and the highest number of oyster perches on each needle. 2 Investigation results and analysis 2.1 Disease distribution After investigation, the area of disease in the whole area was 6805 mu, including 750 mu of black pine and 6055 mu of Adenophora. There were 640 deaths in the whole plant. The disease index ranged from 14 to 58.97 with a dryness of 28.0 (Table 1). Adenosine pine and sickness are similar, slightly heavier pine. Red pine