外施硅肥与灌溉方式对草地早熟禾白粉病病情的影响

为探索硅肥与灌溉方式对草地早熟禾（Poapratensis）白粉病的防治效果，试验通过室内盆栽研究了外施硅肥与根灌对草地早熟禾白粉病病情的影响。结果表明，根灌对草地早熟禾白粉病病害的抵制作用不明显并具分异性；对于患病较重的禾草，根灌会使病情加重。外施SiO2溶液可以显著减轻草地早熟禾白粉病的病情指数和病害程度（P〈0．05）。在试验设定的硅肥梯度（0、31、92、275mg／m^2）内，随着施硅量的增加，病情的减轻愈显著。

Effect of Exogenous Silicon Application and Irrigation Methods on Powdery Mildew of Poa pratensis

In order to explore the controlling of powdery mildew disease on Poa pratensis from the silicon application and irrigation point of view, this indoor potted experiment was carried out to study the effect of application of silicon and root irrigation on powdery mildew disease of Poa pratensis. The results showed that root irrigation had insignificant as well as differential inhibitory effect on powdery mildew disease of Poa pratensis, and increased disease for those in grave conditions （for the gramineous grass while the disease was serious, root irrigation would aggravate the disease severity）. The external application of SiO2 could significantly decrease the disease index and the disease severity（P〈0.05）. With the increase of the silicon materials input, the disease severity decreased within the concentration of silicon （0, 31, 92, 275 mg/m^2） set up in experiment.