It is reported in this paper that the different provenances of Paunownia exist significant difference in witches'- broom resistant ability,by investgating of witches' -broom morbidity and contagious index of 23 Paunownia tomentosa and 34 Paunownia fortunei provenances.Witches'-broom resistance is close related to the geographic distribution of the provenance,and its heritability, coefficient of heredity variation are comparatively high.Therefor,it shows that provenance selection is an efficienct way to enha...