重寄生作用(hyperparasitism) hyperparasitism by a Trichoderma strain on the plant pathogen (Pythium on the surface ←一Pythium of pea seed.The Trichoderma strain was Trichoderma stained with an orange fluorescent dye while the Pythium was stained green.重寄生作用(hyperparasitism) hyperparasitism by a Trichoderma strain on the plant pathogen (Pythium) on the surface of pea seed. The Trichoderma strain was stained with an orange fluorescent dye while the Pythium was stained green