Abstract
The virus isolated from mosaic plants of squash, the symptoms and host range of which were described in the previous paper, withstood 50°C for 10min., 1/500 dilution and 5 days' aging in vitro. It was inactivated in extracted sap by 55°C for 10min., by 1/500 to 1/1, 000 dilutions or by 5 to 10 days' aging at room temperature. It failed to protect cucumber and squash plants from infection by cucumber mosaic virus, showing that the virus is not allied to the cucumber mosaic virus.
The virus was compared with the descriptions of those viruses that have been reported to be infective principally on cucurbits, and was identified to be a strain of the melon mosaic virus designated by Lindberg et al. in 1956. It may be closely related to the bottle gourd mosaic virus described by Vasudeva and Lal in India, or to the cantaloupe mosaic virus reported by Aycock, or to the watermelon mosaic virus described by Anderson in U.S.A.
From mosaic plants of white gourd, oriental pickling melon and watermelon, a virus was recovered, being very similar with the present Virus in pathogenicity.
