几年来,在我们这里发生的松、杉立枯病主要有两种类型:一种是倒伏,一种是根腐。这是由于春雨连棉,雨水多的时侯,水分不仅占据了土壤毛细管,而且充满了土壤的每个细粒,使土壤的粘性加大,粘果,解除了毛细管现象。水分积聚在苗木周围,苗木所吸收的,大部分是水分,养分很少,使茎干呈现出“水肿”。用手拉苗木的时候,便出现如藕断丝连一 In the past few years, there have mainly been two types of blight that occur in our area: one is lodging and the other is root rot. This is due to the spring rain with cotton, rainy time, the water not only occupy the soil capillaries, but also filled with each of the fine soil, so that the soil viscosity increases, sticky fruit, the lifting of the capillary phenomenon. Water accumulation in the seedlings around, seedlings absorbed, most of the water, little nutrients, so that the stem showed “edema ”. When using hand-drawn seedlings, there will be a lotus even with a wire