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水仙大褐斑病菌[Stagonospora curtisii Berk.Sacc.]在感病球茎和病残叶上越夏;以菌丝体在播种后当年发病的叶片上越冬。初侵染发生于11月下旬,翌年3月下旬以后随气温回升,雨量增多,再次侵染以4月下旬至5月上旬为发病盛期。病菌分生孢子主要靠雨水传播,田间可见明显发病中心。气温、降雨量、栽培品种,种植密度及耕作制度与发病有关。4、5月雨量多,气温偏离,连作地、种植密度大均发病较重,播种前用40％福尔马林120倍液浸种3.5小时,防效达47.7％,生长期连续喷施75％百菌清800倍液或50％多菌灵500倍液有一定的防治率果。
Narcissus daucuscens [Stagonospora curtisii Berk. Acac.] The more summer on susceptible bulbs and diseased leaves; the mycelium overwintered on the leaves of the year after sowing. Initial infection occurred in late November, followed by the end of March the following year with the temperature rise, rainfall increased, re-infection in late April to early May for the peak incidence. Conidia germs mainly spread by the rain, the field can be seen clearly the incidence center. Temperatures, rainfall, cultivars, planting density and farming systems are associated with the onset of disease. April and May rainfall, the temperature deviation, even for the place, the planting density of the disease were heavier, before sowing with 40% formalin 120 times soaking 3.5 hours, the control effect of 47.7%, the continuous spraying of 75% Chlorothalonil 800 times or 50% Carbendazim 500 times have a certain rate of control fruit.