Translations:Manfred Klett: Von der Agrartechnologie zur Landbaukunst/880/en

with generative propagation; unless the parent generation is a virus carrier, a chief problem with the replanting of potatoes, the propagation of fruit trees, etc. Nature itself demonstrates the high self-compatibility of vegetative propagation, for example: couch grass (*Agropyron repens*), stinging nettle (*Urtica dioica*), thistle (*Cirsium arvense*), field bindweed (*Polygonum convolvulus*), horsetail (*Equisetum arvense*), etc.