Abstract
In morphology, particle length distribution, buoyant density, and stability in sap, wheat yellow mosaic virus (WYMV) was almost identical to wheat spindle streak mosaic virus (WSSMV). These had common antigens as well as different ones and crossprotection was observed between them. Slight differences were observed in the symptoms produced on some wheat varieties by these viruses. On the basis of these results, it is concluded that WSSMV is a strain of WYMV.
