湿地松苗木黄化、紫矮病,是较普遍的一种病害,轻则苗木生长停滞,呈紫矮状,重则死亡,对苗木的产量和质量影响很大。病害是非侵染性的,在新育苗地或土质较粘、排水不良和瘠薄的土壤上,最易发生。此病开始,苗木新梢失绿转黄,6月份雨季的结束以后雨量显著减少,遇上几天连续高温干旱,苗木因根系不发达缺乏菌根,水分养分吸收困难,地下地上部分供不应求,致使针叶细胞受到抑制或破 Slash pine seedlings yellow, purple dwarf disease, is a more common disease, ranging from seedling growth stagnation, purple dwarf, heavy death, a great impact on the yield and quality of seedlings. The disease is non-infective and is most likely to occur on new nursery or soil where soil is sticky, poorly drained and barren soil. The beginning of the disease, the green shoots turned green turn yellow, after the end of the rainy season in June significantly reduced the rainfall, the case of consecutive days of high temperature and drought, seedling lack of roots because of lack of mycorrhizal fungi, nutrient absorption difficulties, the ground aboveground areas in short supply, resulting in Needle cells are inhibited or broken