The detective sensitivities in leaf saps were 4000 dilutions for PVM and OMV, and a few virus particles could still be seen at the dilution of 16000 of BYMV infected leaf sap.

• PVM和OMV的病汁液检测灵敏度均为稀释4000倍,而BYMV病汁液稀释16000倍时还能检测到少量病毒料子。