Abstract: In order to reveal the genetic diversity and systematic evolution of Chinese greylag goose breeds, the 521 bp control region (D-loop) of mitochondrial DNA from 13 greylag goose breeds were sequenced. In the D-loop, the contents of T, C, A, and G nucleotides occupied 23.8%, 29.0%, 32.3%, and 15.0%, and the average haplotype diversity (H_d) and nucleotide diversity (P_i) were 0.19245 and 0.00036, respectively. The nucleotide variance value among the populations was bigger than that within the populations, and no population expansion was observed for the breeds. The shared haplotype analysis and systemic evolution analysis revealed that the 13 breeds had two maternal origins, among which, Yili breed originated from greylag goose (Anser anser), and the other 12 breeds originated from swan goose (A. cygnoides).

Key words: Small green leafhoppers, Beauveria bassiana, Paecilomyces fumosoroseus, Emulsifiable formulation, Imidacloprid, Tea