causal agents

及收英语手抄报有关植物_百度知道 ... ) blast 枯萎病 ) causal agents 病原体 ) causal organism 病原生物 ...

植物病因(causal agents)种类: Plant diseases are classified as follows: Ⅰ.Infectious plant diseases (pathogens) 1.diseases ...

...f their problems），而是这些起因的领受者（causal agents）而已（引自Payne,1997:287）。