Studies on Evaluation of Resistance of Maize Germplasms to Curvularla Lunata (wakk) Boed. in Northeastern China

Maize disease of Curvularia leaf spot was caused primarily by Curvularia Lunata(wakk) Boed.In recent years,the occurrence area of this disease in main maize production zone was expanding annually and the state of it was becoming severer and severer.In this report we studied the disease resistance difference between cultivars and inbred lines with different sources.The conclusions as follows:There was apparent disease resistance difference between varieties and inbred lines.The disease resistance of hybrids and inbred lines with different source was quite different.Some germplasms which have been used for many years such as Ji63,Huangzao4,Zi330,Dan9046,Dan9041,Tie7922,Ye478,Shen5003,Mo17,Dan340 and E28 and so on were sensitive to the disease(MS～HS),while some germplasms of new-bred populations and some exotic germplasms with tropical and subtropical blood such as 78599 were all resistant to the disease(R～HR).The relationship between hybrids and their parents on disease resistance was quite closely.The disease resistance would weaken with the growth of plants gradually.Therefore the plants appear high resistance at seedling while become sensitive at silking period.We acquired a series of varieties and inbred lines with disease resistance to Curvularia Lunata(walk) Boed.which provided disease-resistant germplasm resources for maize breeding.