根据气象预报、历史资料、品种布局和2007年蔬菜病虫发生实况综合分析,北京市植物保护站近日预计2008年北京地区蔬菜病虫害为中等发生,病虫并重;大部分常发病虫维持常年发生水平,部分田块中等偏重发生;一些特殊病虫在局部发生为害突出。 According to the factual analysis of meteorological forecast, historical data, variety distribution and occurrence of vegetable diseases and pests in 2007, Beijing Plant Protection Station recently predicted that pests and diseases of vegetables in Beijing occurred moderately in 2008 with the same emphasis on pests and diseases. Most of the pests and diseases were perennial Level, part of the plots moderately heavy occurrence; some pests in the local occurrence of prominent pests.