Abstract: Using artificial inoculation methods，on offspring of Ditylenchus destructor， the pathogenicity， fecundity of that were determination， the results showed that: hybrids combinations within the same genotype can successfully． Compared of the number of descendants， found in the various groups and control parents were significantly different， the hybridization rate and the number of F₁hybrid were lower than the control group(the control group as the parents selfed) ; The hybrid groups and control DeSD population， in pathogenicity， reproductive performance， there were differences at the P0． 05 level; Compared with groups of reciprocal groups and the control population in the pathogenicity， fecundity，performance characteristics of the anti-crosses was higher than the orthogonal on the control DeSD; Correlation analysis was showed that pathogenicity and fecundity of Ditylenchus destructorhybridization groups were positively correlated． This study has important applications on the genetic diversity of Ditylenchus destructorand the virulence differentiation of simulating proliferation of hybrids of Ditylenchus destructorpopulations in different geographical origin，at the same time，This was provided a theoretical basis on the risk assessment of pest invasion from different geographical origin．

Key words: Biological hybrid, Ditylenchus destructor, Pathogenicity, Fecundity

CLC Number: 

• S435