研究了不同形态硅源制剂二氧化硅纳米粒子溶胶(60 nm和100 nm)、正硅酸乙酯、硅酸钠对小麦白粉病的作用效果以及对白粉病菌孢子萌发的影响。结果表明,在相同浓度下几种硅源制剂处理盆栽小麦幼苗对白粉病防效分别为48.78%、43.73%、40.31%和33.29%,室内处理小麦离体叶段对白粉病抑制率分别为59.67%、53.51%、51.10%和42.22%。离体叶段接种白粉菌后1.5~2 h、6~7 h取样,在相差显微镜下观察白粉菌孢子萌发过程,发现这几种硅制剂对白粉菌孢子初生芽管(PGT)的形成几乎没有影响,但对附着胞(AM)的形成有较大影响,其中以二氧化硅纳米粒子溶胶对AM的影响最大。 The effects of silica nanoparticles (60 nm and 100 nm), TEOS and sodium silicate on wheat powdery mildew and spore germination of powdery mildew were studied. The results showed that the control effect of potted wheat seedlings on powdery mildew was 48.78%, 43.73%, 40.31% and 33.29% at the same concentration, respectively. The inhibitory rates of detached leaf segments on powdery mildew in wheat were 59.67 %, 53.51%, 51.10% and 42.22%. In vitro leaf segments inoculated with powdery mildew 1.5 ~ 2 h, 6 ~ 7 h sampling, under the phase contrast microscope to observe the spore germination of fungus spores and found that these silicon formulations on spore germination of powdery mildew germinal tube (PGT) almost no But had a great effect on the formation of attachment cells (AM). Among them, silica nanoparticle sol had the most significant effect on AM.