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我所于65年起,陆续对黔中部份地区马尾松病害种类、为害情况、防治方法作了初步调查,现将调查情况摘要报告如下: 一、调查方法采用路查和详查相结合,先行踏查了解病害种类,重点设立标准地进行详查。幼林评查根据不同病害种类所拟定的发病等级,采用隔林间行或随机抽样进行每木目测记载,每块标准地调查株数不少于100株。根据目测结果用分级计数(即:健康、轻、中、重、极重五个感病等级)求具株被害率和发病强度即感病指数;苗期病害调查,采用对
From 65 years onwards, I made a preliminary investigation on the types, damage and prevention methods of Masson pine in parts of central Guizhou. The report summary of the investigation is as follows: I. Method of investigation By combining road survey and detailed investigation, First check to understand the type of disease, focusing on the establishment of a standard detailed investigation. Young forest assessment According to the different disease types of the proposed level of incidence, using inter-forest or random sampling for each visual record, each of the standard survey of not less than 100 strains. According to the visual result, the damage rate and the disease severity index of the strain were calculated by grading counting (ie, healthy, light, medium, heavy and extremely severe five susceptible levels); the investigation of seedling diseases,