44 BACTERIAL DISEASES OF PLANTS 



disease and a definite history of successful inoculations but a 

 very imperfect description of the parasite, one statement in 

 which is erroneous. 



Petri gives Bacterium mori B. and L. and Bacillus cubonianus 

 Macchiatti as synonyms of Ascobacterium luteum Babes. The 

 latter may be, since it is described as yellow, capsulate and lique- 

 fying (sporiferous, however, according to Macchiatti) but the 

 former cannot be since Boyer and Lambert obtained with it a 

 disease due to a white organism. The mulberry blight of the 

 United States, of France, and of South Africa, is identical and 

 is due to a non-liquefying white schizomycete, as proved inde- 



FIG. 265. South African mulberry twigs killed by Bacterium mori. After 



Ethel M. Doidge. 



pendently in the United States by Smith, Rorer, and O'Gara, 

 in France by Arnaud and by Smith, and in South Africa by 

 Ethel M. Doidge. My observations of the signs and lesions of 

 the disease made both in the United States and in France cor- 

 respond closely to Boyer and Lambert's description of their 

 disease. They state that with the parasite taken from blighting 

 stems of the mulberry they produced the characteristic disease 

 on the parenchyma and in the veins of the leaf, but their de- 

 scription of this parasite is limited to the bare statement that 

 " Isolated and cultivated on the surface of artificial solid media, 



