马尾松在育苗过程中,每年都有不同程度的矮生病发生。发生后,苗木停留在休眠状态,影响产量和质量,以及造林成活率。为此,我们采取及时追施所缺元素,苗木得到恢复生长,已获显著效果。矮生病开始发生在4月中旬,至5月下旬仍有不同程度的发生。发病初期,病苗基部叶子呈淡红色,逐渐向幼苗上部蔓延。后呈淡紫色,新针叶短小,蔓延到苗木地上部分的2/3—4/5时,与苗冠近于水平,针叶先端成黄色,地下部分的根系停止生长,看不到白色根尖,整株苗木停留在休眠状态,后期严重时会枯萎死亡。 Masson pine seedlings in the process of nurturing each year to varying degrees of dwarfism. After the occurrence, nursery stock stays in dormancy, affecting yield and quality, as well as afforestation survival rate. To this end, we have adopted the elements that are lacking in a timely manner and the seedlings have regained their growth and have achieved remarkable results. Dwarf disease began in mid-April, and still to varying degrees in late May. Early onset, the base leaves of the disease was pale red, gradually spread to the upper seedlings. After the lavender, the new conifer is short, spread to 2 / 3-4 / 5 on the ground part of the seedlings, and the seedling near the level of the tip of the needle into yellow, the underground part of the root to stop growing, can not see the white roots Sharp, the whole plant seedlings stay in dormancy, later severe wither death.