论文部分内容阅读
1.森林病虫害预测预报的主要内容是什么？ 森林病虫害预测预报的主要内容包括森林病虫害的发生期、发生量、发生范围和危害程度。发生期预报是对森林病虫害的各个危害阶段的始、盛、末期进行预测，以确定防治的最适时期。发生量预报是对森林害虫的虫口密度、虫株率或森林病
What is the main content of forest pest forecast? The main contents of forest pests and diseases forecasting and forecasting include the occurrence period, occurrence amount, occurrence scope and degree of harm of forest pests and diseases. Occurrence forecast is to predict the beginning, end and end of each stage of forest pests and diseases hazards to determine the most appropriate period of prevention and treatment. Occurrence forecast is the pest population density, pest rate or forest disease to forest pests