为了找到防治桉树紫斑病的高效、持久、安全的杀菌剂，通过林间防效试验研究10%苯醚甲环唑水分散粒剂、500 g/L甲基硫菌灵悬浮剂、50%多菌灵可湿性粉剂对桉树紫斑病的防治效果，以清水为对照。结果表明，3种药剂对桉树紫斑病都有较好的防治效果。每隔10天施药，连续3次施药后，桉树大多能恢复生长，长出新梢。10%苯醚甲环唑水分散粒剂1500倍液对桉树紫斑病的防治效果最好，病情指数为25.24，防效为40.24%，500 g/L甲基硫菌灵悬浮剂600倍液的病情指数分别为27.09，防效为35.87%，50%多菌灵可湿性粉剂500倍液的病情指数分别为32.21，防效为23.74%。清水对照的病情指数为42.24。3种药剂用后都未发生药害。

To search the high-efficiency, long time-efficiency and safe fungicides against Eucalyptus purple blotch, difenoconazole 10% WG, thiophanate-methyl SC at the concentration of 500 g/L and 50% carbendazim WP were evaluated through experiment in forest and clear water as CK. The results showed that: 3 kinds of fungicides all had relatively good effect for controlling eucalyptus purple blotch. The most of eucalyptus were able to restore growth, grow new shoots after the 3rd round of spray at the interval of 10 days. And, the 1500 times of difenoconazole 10% WG possessed comparatively satisfied effect on Eucalyptus purple blotch. After using the fungicide, its disease index was 25.24, and its controlling effect reached 40.24%; followed by the 600 times of thiophanate-methyl SC, its disease index was 27.09, and its controlling effect reached 35.87%; and the 500 times of 50% carbendazim WP, its disease index was 32.21, and its controlling effect was 23.74%; the disease index of CK was 42.24. The above fungicides were safe to Eucalyptus.