Isolation, identification and biological characteristics of Fusarium verticillioides from maize ear rot samples in Gansu Province Isolation, Identification and Biological Characteristics of Fusarium equiseti from Maize Ear Rot Samples Occurrence of Fusarium species and fumonisins associated with maize kernels from Gansu Province Isolation, identification and analysis of rDNA-ITS gene sequence of Fusarium culmorum from maize ear rot samples