不同杀菌剂防治九里香白粉病药效试验

于2003年5月19日至6月17日，用70％甲基硫菌灵可湿性粉剂、75％百菌清可湿性粉剂、20％三唑酮超微可湿性粉剂和30波美度的石硫合剂在广西生态工程职业技术学院的学院办公楼前(A区)、化学实验楼前(B区)、水塘区教工宿舍周围(C区)、学院图书馆旁(D区)的九里香自粉病(Oidium sp．)进行药效防治试验。每区设70％甲基硫菌灵1000倍、75％百菌清600倍、20％三唑酮1000倍、0．2波美度石硫合剂、清水对照5个处理，每个处理重复3次，喷药3次。每次喷药后第7d调查防治效果，计算病情指数。结果表明：用0．2波美度的石硫合剂或70％的甲基硫菌灵1000倍液防治九里香自粉病，效果均优于生产上惯用的三唑酮、百菌清，平均防效达76％以上。

Experiments of Chemicals on the Control of Oidium sp.

From May 19 to June 17,2003,a chemical effect experiment on the Murraya paniculata Oidium sp was conducted in the areas around the Administration Building (area A),the Chemical Lab Building (area B),the Pond near Teachers'Dormitory (area C)and the Library (area D)in the campus.The chemicals are Methionine Powder of 70%,Chlorothalonil Powder of 75%,triadimefon of 20%,and Lime Sulphur of 30 Baume.Each area was sprayed three times with the 70% Methionine Powder of 1000,75% Chlorothalonil Powder of 600 times,20% triadimefon of 1000 times,and 0.2 Baume Lime Sulphur of 5 times water.On the 7th day after each spray,the disease indices were recorded.The treatments of 0.2 Baume Lime Sulphur and 70% Methionine Powder of 1000 are better than the common Chlorothalonil and triadimefon,with 76% upward on everage in prevention effect.