The colony form of P. parasitica in PDA is like flower petal.
在PD A培养基上辣椒疫霉菌落呈放射状，寄生疫霉的呈花瓣状。
2
After citrus was infected by P. parasitica, the contents of these products in resistant tissues rose faster, and peak values higher, than the susceptible ones.
The antibiotic 2507 has also satisfactory effect for controlling chinese cabbage downy mildew disease infected by Peronospora parasitica Fr. with efficacy 87.5%in field test.