论文部分内容阅读
为有效预防和控制１９９９年山东省主要林木害虫的发生与危害，依据１９９８年山东省气候、林木害虫发生情况等因素，对１９９９年主要林木害虫的发生趋势做如下分析，供各地参考。１１９９８年林木害虫发生情况根据１９９８年度林木害虫发生统计报表汇总，全省有林地面积...
In order to effectively prevent and control the occurrence and harm of the major tree pests in Shandong Province in 1999, based on the factors such as the climate and pests in Shandong Province in 1998, the following trends are analyzed for the occurrence of major tree pests in 1999 for reference. The occurrence of forest pests in 11998 According to the summary statistics of forest pests in 1998, the province has forest land area ...