Eucalyptus was an important fast-growing tree species in the world. Cylindrocladium quinqueseptatum with the characteristics of wide distribution, strong spreading ability, damage degree and great output reduction was a kind of disease in the world which harm to the seedlings and young trees of eucalyptus. It was a ultimate way to select resistant cultivars of eucalyptus to prevent this disease because the disease was difficult to prevent and cure by chemical measures. The current study on the C. quin...