82 The Pathogenecity of Pathogens and the Resist- ance of plants病原物的致病性和植物的抗 病性 1. The variation of Pathogenecity in Pathogens (1) Pathogenecity致病性 Ⅴ irulence毒性十 Agressiveness浸袭力 Specific pathogenecit!y专化致病性(寄生性病原物) Non- specific pathogenecity非专化致病性(腐生物)§2 The Pathogenecity of Pathogens and the Resist-ance of Plants 病原物的致病性和植物的抗 病性 1. The Variation of Pathogenecity in Pathogens （1）Pathogenecity 致病性 = Virulence 毒性 ＋ Agressiveness 浸袭力 • Specific pathogenecity 专化致病性（寄生性病原物） • Non-specific pathogenecity 非专化致病性（腐生物）