石硫合剂在黄瓜叶面病害防治中的应用

Application of Lime-sulfur in Controlling Cucumber Foliage Diseases

研究了45%晶体石硫合剂对灰霉病等6种黄瓜叶面病害的防治效果。结果表明:石硫合剂100倍液对病害的防效较好,防效均在62%以上。石硫合剂对黄瓜褐斑病的防效最好,当浓度为400倍液时,防效也达50%以上;对水稻纹枯病防效较差,只有浓度为100倍液时,防效达60%以上,其他各浓度的防效均不理想。同时,本试验探讨了石硫合剂持效期与黄瓜灰霉病防治效果之间的关系,黄瓜苗在喷施200倍液石硫合剂之后立即接种灰霉病菌的效果较好,防治效果为45·6%。随着接种间隔期的延长,防效逐渐降低。当接种间隔期为120h时,石硫合剂对黄瓜灰霉病无防治效果。

Effect of 45% lime-sulfur on six cucumber foliage diseases were investigated. The results showed that 100 times lime-sulfur gave an effective control of the diseases, with the control efficiency of above 62%. The effect of lime-sulfur against the disease which was caused by Corynespora cassiicola on cucumber was best when the concentration was 400 times, the control efficiency reached above 50%. Lime-sulfur had a poor effect on the disease caused by Rhizoctonia solani, only when the concentration was 100 times, with the control efficiency of above 60%. The control effect of other treatments on rice sheath blight were poor. The relationship between the persistent period and the control effect of 200 times lime-sulfur on cucumber gray mold was also analyzed. It was found that the best control effect was obtained when the application interval was Oh, with the efficiency reaching 45.6%. With the increase of application intervals, the control efficiency gradually reduced. Application at 120h intervals had no effect on cucumber gray mold.