北京市门头沟区是京白梨主要产区。为防治京白梨的黑星病,于1958年在房山县坨里公社上万大队(原属京西矿区)用不同倍数的波尔多液进行试验,后又在妙峰公社丁家滩、担礼等生产京白梨的大队扩大示范,都取得了很好的效果。 多年的生产实践,证明用350-400倍石灰倍量式波尔多液防治京白梨黑星病,既避免了药害又降低成本 Beijing Mentougou District is the main producing area of ​​Beijing White Pear. In order to prevent and control Pekinensis pear scab, in 1958 in Fangshan County Tuoluli commune tens of thousands of brigade (formerly Jingxi mining) with different times Bordeaux mixture test, and later in Miaofeng commune Dingjiatan, Pear brigade and other production to expand the demonstration team, have achieved good results. Years of production practice, proved with 350-400 times lime-type Bordeaux mixture to control Pekinensis scab, both to avoid injury and reduce costs