The interactions between pathogens and their host plants, which are very common in nature plant populations, have been studied as a focus by western ecologists since 1980s. Study on the relation of pathogen to host plant may give convenience to discovery the regulation of interaction between them and form the base of mechanism of resistance to disease of host plant and inheritance breeding of disease free.
The host T. repens is a perennial herbaceous plant. It is common that this plant is infecte...