The disease was contagious during growth. Transfer was by lice and probably also bugs. Another possibility was transfer within the soil. The rapidity of spread depended largely on still unknown environmental conditions. Control was sought first in the possibility of breeding less susceptible varieties, as there were great differences in susceptibility.
|Qualification||Doctor of Philosophy|
|Award date||8 Dec 1920|
|Place of Publication||Wageningen|
|Publication status||Published - 1920|
- plant diseases
- plant viruses
- solanum tuberosum