摘要
[Objective] The aim was to study the effect of three new fungicides against rice sheath blight in field experiment. [Methods] The experiment set up 7 treatments with three times of repetition and designed by random grouping. By using 5 sampling points in each plot, and investigating continuous 4 holes of each point, total plants, diseased plants and disease degrees were recorded. Then disease index and control efficiency were calculated, and variance analysis was carried out. [Results] 300 or 450 ml/hm^2 azoxystrobin ＋ difenoconazole 325 g/L SC had better control efficiency to rice sheath blight and had no phytotoxicity effect, we should use it at the initial disease stage and continuously spray 2-3 times. [Conclusion] The experiment provided a theoretical basis for controlling rice sheath blight using fungicides.
[目的]探讨3种新型杀菌剂对水稻纹枯病田间药效作用。[方法]试验共设7个处理,重复3次,随机区组排列,每小区采取5点取样法,每点调查相连4穴,共计20穴。记载总株数、病株数和病级数。计算病指和病指防效,并进行方差分析。[结果]嘧菌酯+苯醚甲环唑325 g/L SC 300 ml/hm2或450 ml/hm2对水稻纹枯病有较好的防治效果,无药害作用,在水稻纹枯病发病初期使用,连续喷药2-3次。[结论]为采用杀菌剂防治水稻纹枯病提供理论依据。
