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落叶松(以长白落叶松为主,间有少许日本落叶松)苗心止病,是一种生理性的病害,多发生于落叶松播种苗及移植苗,出圃造林幼树亦有发生。它的症状是:落叶松苗在生长期间,发病后针叶由绿变深绿,生长点停止生长,顶芽四周长出多层鳞片,形成饱满近似球状的顶芽。播种苗于6月上旬到7月上旬发生;移植苗在7月下旬,顶芽发病后,一直到秋季起苗时也不再突破萌发了。灌溉、施肥是培育落叶松苗极重要的环节,对其管理不周,常会引起幼苗心止病发生,致使育苗失败。现对此病的发病原因和防止办法,谈谈粗浅意见。
Larch (dominated by long white larch, between a few Japanese larch) Miao heart disease, is a physiological disease, occurs in larch sowing and transplanting seedlings, nursery afforestation saplings have occurred. Its symptoms are: larch seedlings in the growth period, after the onset of the conifer from green to dark green, the growth point to stop growing, the top of the bud grow multi-layer scales around the formation of full-bodied globular top bud. Sowing seedlings in early June to early July occurred; transplant seedlings in late July, after the onset of the top buds, until the autumn seedlings no longer break through the germination. Irrigation and fertilizing are the most important steps to cultivate larch seedlings. The management of larch seedlings is not good, which often causes the heart disease of seedlings to occur, resulting in failure of nursery. Now on the incidence of the disease and prevention methods, to talk about the superficial views.