The relationship between horizontal resistance and aggressiveness in the parasitic fitness of interaction between host cultivar and pathogen race was studied.

• 从初步研究结果可基本确定，在没有垂直抗性或垂直抗性被相应毒性基因克服了的组合中，品种水平抗性和小种侵袭力以乘积的方式构成寄生适合度。