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常见的幼苗侵染性病害有猝倒病、立枯病、炭疽病、叶斑病。这类病害发生快,发生后可以互相传染,常造成缺苗断垄,防治时一要注意栽培防病 ①坚持轮作制,不在同一块圃地连续培育同一种苗木。②不选择地势低洼易渍水的地块作苗圃,苗圃地要有相应的排灌设施。③播前精选种子,淘汰弱种,因弱种发芽率差,而且往往是病害的初侵染源。④精细整地,适时播种,注意播种深度,盖土不过厚,使种子能迅速萌发出苗,可增强幼苗的抗逆性。⑤增施熟腐的有机肥料,满足苗木对各种营养元素的需求,使苗木健壮生长。二要作好种子消毒 ①用0.5％的福尔马林液喷洒种子,拌匀
Common seedling infested diseases are damping-off disease, blight, anthracnose, leaf spot disease. Such diseases occur quickly, after the occurrence of mutual infection, often resulting in lack of seedlings broken ridge, prevention and treatment should pay attention to the cultivation of disease prevention ① adhere to the rotation system, not in the same nursery for continuous cultivation of the same seedlings. ② do not choose low-lying land-based waterlogging plots for nursery, nursery to have appropriate irrigation and drainage facilities. ③ sowing before the selection of seeds, eliminate weak species, poor seed germination rate, and often the initial source of disease infection. ④ fine preparation, timely sowing, pay attention to the depth of sowing, covering the soil but thick, so that seeds can germinate rapidly, can enhance seedling resistance. ⑤ additional cooked rotten organic fertilizer to meet the needs of nursery stock of various nutrients, seedlings robust growth. Second, make good seed disinfection ① 0.5% formalin sprayed seeds, mix well