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1 病害症状:1.1褐班病:是由丝核菌引起的一种病害。危害高羊茅、草地早熟禾、黑麦草、剪股颖等多种草坪,尤以剪股颖为甚。一般是6月上旬开始发病,危害过程是从中心点呈圆形向外扩展蔓延,往往是形成直径5厘米到40厘米的枯草斑,边缘红褐色或褐色,如不及进防治发病时间一直可以持续到9月份。发病最适温度为21℃-23℃。1.2锈病:危害黑麦草,草地早熟禾、匍匐剪股颖、高羊茅、结缕草属种、狗牙根等多种草坪草。危害期3-10月,8-10月份较为严重。在不同草坪的叶片、叶鞘或茎杆上生成黄色至铁锈色的夏孢子堆和黑色的冬孢子堆,其椭圆形或棒状小突起破裂后散播铁锈色菌粉,远看草坪一片锈黄色。发病最适温度为15℃-20℃。1.3腐霉枯萎病:是由腐霉菌引起的一种病害。在高温高湿条件下,腐霉菌侵染冷季型草坪及狗牙根等根茎叶部位,出现褐色或红色病斑,最后使其腐烂死亡,病菌侵染处草坪草一丛丛死亡,使草坪上出现圆形或不规则形状的枯草斑。早晨观察发病
1 disease symptoms: 1.1 brown class disease: caused by the Rhizoctonia a disease. Harm the tall fescue, Kentucky bluegrass, ryegrass, Shendan Ying and other lawn, especially in the Ying-Ying is staggering. Usually beginning in early June, the hazard process is a circular outward spread from the center of the spread, often forming a diameter of 5 cm to 40 cm of haystack, edge reddish brown or brown, if not into the onset of the disease has been able to continue Until September. The optimal onset temperature of 21 ℃ -23 ℃. 1.2 Rust disease: endangered ryegrass, Kentucky bluegrass, creeping Ying Ying, tall fescue, Zoysia species, bermudagrass and other lawn grass. Danger period 3-10 months, August-October is more serious. In different lawn leaves, leaf sheaths or stems to produce yellow to rust rust summer spores and black winter spore pile, the oval or rod-like small protrusions scattered rust rust bacteria, far from the lawn a rusty yellow. The optimal onset temperature of 15 ℃ -20 ℃. Pythium wilt disease: Pythium is caused by a disease. Under the conditions of high temperature and high humidity, Pythium invades cold-season lawn and bermudagrass and other stems and leaves, brown or red spots appear, finally decay and death. Appear round or irregular shape of haystacks. Morning onset of the disease