农抗120防治小麦白粉病的应用技术研究

1989—1990年在河南省8个县市对农抗120防治小麦白粉病进行了田间试验。结果表明:在4月上中旬,小麦白粉病发生的病株率达15～20％,病叶率10％左右时,应用100ppm农抗120喷雾防治2次,防效达70～85％。防病效果与防治时间、喷药次数和发病程度关系密切。施药越晚,效果越差。农抗120的防治效果优于多菌灵等常用化学药剂,在发病初期喷药2次,防治效果与施用粉锈宁相近,可作为粉锈宁紧缺情况下的首选替补药物。但在病害大流行时施用,作用缓慢,效果较差。

STUDIES ON THE APPLICATION TECHNIQUE OF AGRICULTURAL ANTIBIOTIC 120 TO CONTROL WHEAT POWDERY MILDEW, ERTSIPHE GKAMINIS

Field studies on the application technique of Agricultural Antibiotic 120 to control .the wheat powdery mildew were conducted in eight cities/counties of Henan Province during 1989-1990. A 70-85% control effect was obtained when two applications were made during early to mid-April when the stem infection incidence was 15-20% or 10% leaf infection. The control effect was influenced by timing and frequency of application and level of infestation. The later the application, the poorer the control effect. The results also showed a better control effect by Agricultural Antibiotic 120 than that by chemical fungicides such as Thiophanate and Carbendazol. The effect of two applications of "120" at early infestation stage was similar to that of Triadimefon. It is thus recommended that "120" can be used as an alternative for Triadimefon when the latter is in shortage. Application of "120" at the epidemics resulted in slow and poor control effects.