The rate of rot apple fruits and the number of spot in leaves treated with antibiotic 751 (100 time of ferment solution) and Bordeaux mixture alternately were lower than that treated with chemicals.

• 田间将生物药剂与波尔多液交替使用后；经“751”100倍液防治的轮纹病烂果率低于化学农药处理；且对早期落叶斑点病有明显的抑制作用.