黑龙江省水稻恶苗病影响因素的研究

Studies on the Epidemic of Bakanae Disease of Rice in Heilongjiang Province

本研究认为，我省水稻恶苗病的发生主要与品种抗性、栽培条件、气候因素等有关。发病程度与５月上、中旬总日照时数达极显著相关，现生产上较易感病品种占种植品种的１／６左右。该病的初显期一般在５月１０日前后，采取湿润育苗法一般发病较轻。根据该病的发生规律，认为旱育苗床在大气温度达２０℃时要采取开棚通风降温的防治措施。

In the study, it was revealed that the bakanae disease of rice(Fusarium moniliforme Sheld)in Heilongjiang Province varied with the varietal resistance,the conditions of cultivation and climatic factors et al.The sevverity of the disease was significantly related to the total hours of sunshine during the period of 20 days from the frist to twentieth of May.The on-set phase of epidemic of the disease was argund tenth of May.The disease could be reduced when the way of raising rice seedling on wet nursery was used. Based on the regularity of the did disease development,the method of aeration cooling should be abopted to control the disease when the temprature got at 20℃ in the plastic film house of dry seedling nursery.