砍除桧柏防治梨锈病的效果１９９３年７月下旬对梨树相对集中、四周桧柏较多、病害危害严重的庙宇镇蔷薇四社、永丰六社、柏树三社三个点调查梨锈病危害情况。每个点选择树势、树龄、产量相同的１５年生梨树３０株，在每株的东西南北中各采叶２片，每株１０片，计３００片... In addition to the effect of cypress prevention and control pears rust in late July 1993 pear pear is relatively concentrated, surrounded by cypress cypress more serious damage to the town of the temple town rose four clubs, Yongfeng six clubs, cypress three agencies to investigate pear rust Hazard situation. Each point selection tree potential, age, yield the same 15-year-old pears 30, east and west of each plant in each of the two leaves, 10 per plant, counting 300 ...