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1.兰花炭疽病发病初期在叶中部出现圆形、椭圆形,叶缘呈现半圆形的红褐色斑点,后期病斑中心颜色变浅,其上轮生小黑点。病斑大小悬殊,3～30毫米均有,有时病斑呈纵向破裂。老叶多从4月开始发病,霉雨季节发病较多。新叶则从8月开始发病,秋雨连绵时发生严重。盆土粘重、排水不良会加重病害。公园或植物园的兰圃中兰盆放置过密,兰叶相互交错一起时容易传病。浇水时当头喷浇也易诱发病害。此外,品种间的抗病性有一定差异。防治方法:①栽培防病。兰室要注意改善通风透光条件,以促兰花健壮生长。兰盆以用陶盆、瓦盆为好,不用瓷盆,以
1. Orchid anthracnose early onset in the middle of the leaves appeared round, oval, leaf edge showed semicircular reddish-brown spots, late lesion center lighter, on its turn black spots. Distinct lesion size, 3 to 30 mm, and sometimes lesions were longitudinal rupture. Old leaves and more from the onset in April, more incidence of moldy season. New leaves begin to develop from August, when the autumn rains serious. Pond soil sticky, poor drainage will increase the disease. Park or botanic garden blue orchid pots placed too dense, easy to get sick when the leaves are intertwined with each other. Pouring when the first spray is also easy to induce disease. In addition, there is a certain difference in disease resistance between varieties. Prevention and treatment methods: ① cultivation and disease prevention. Lan room should pay attention to improving the ventilation and light conditions, to promote the robust growth of orchids. Orchid basin pots, pots for the better, no porcelain pots