IN a recent communication1 Mr. Mathur gives an account of his observations on the leaf-curl in garden zinnias, caused by Bemisia gossypiperda Misra and Lamba, at Dehra Dun. The title of the letter suggests that the virus causing leaf-crinkle in cottons in the Sudan is the same that causes leaf-crinkle in zinnias at Dehra Dun. This certainly has not been established so far.