oct.is. I92I Transmissible Mosaic Disease of Cabbage 177 



SUMMARY 



From these preliminary observations and experiments it appears that 

 the crucifers here mentioned may be added to the Hst of plants suscepti- 

 ble to mosaic, a disease whose cause has not been discovered but which 

 can be transmitted from mosaic to healthy plants by direct transfer of 

 juice as well as by means of aphids which apparently are very effective 

 natural agents in the dissemination of this disease. 



