山楂树慎用波尔多液波尔多液是果园常用的保护性药剂，但在山楂树上使用易发生果锈。在调查中发现：多数果农爱使用波尔多液，浓度为１∶１∶１６０倍液，每年喷布一次。结果表明：在山楂大果期喷用波尔多液，锈果率为７９３％；在幼果期喷施波尔多液，锈果率为８９３... Caution hawthorn Bordeaux mixture Bordeaux mixture is commonly used in the orchard protective agent, but the use of hawthorn rust prone fruit. Found in the survey: Most farmers love to use Bordeaux mixture at a concentration of 1: 1: 160 times, spray once a year. The results showed that: in the hawthorn spray Bordeaux, fruit rust rate was 79  3%; Bordeaux mixture in the young fruit spray, the rust fruit rate was 89  3 ...