BLACK ROT OF CABBAGE 341 



germs on their body, and, in crawling, depositing them in 

 the region of the water-pores. 



PREVENTIVE MEANS. Rotation of crops is the best 

 means of ridding the soil of the pest. Care should be 

 taken not to allow Cruciferous weeds to flourish, otherwise 

 the benefit of rotation of crops is lost, as the weeds may 

 continue the disease. Slugs and cabbage-feeding cater- 

 pillars should be kept in check. Removal of infected leaves 

 in the early stages of the disease should prove beneficial, 

 as the disease passes down the leaf to gain access to the 

 stem. Finally, it has been shown that when diseased 

 cabbages have been converted into manure, the cabbages 

 manured with this material have shown the disease. 



Smith, in U.S. Dept. of Agric., Farmers' Bulletin No. 68 ; 

 also in Centralb. fur Bakter. Parasitenk. u. Infektionkrank- 

 heiten, 2 Abt., Bd. iii. pp. 284, 408, 478, pi. i. 



OLIVE TUBERCULOSIS 



(Bacillus oleae, Trev.) 



In Italy and other portions of the Mediterranean region, 

 olive trees are subject to a peculiar disease caused by a 

 Bacillus, which causes the formation of irregularly nodulose 

 tubercles on the branches. These tubercles vary in size 

 from one-quarter of an inch to an inch in diameter, and 

 superficially resemble galls of insect origin. 



PREVENTIVE MEANS. Removal of affected branches 

 checks the spread of the disease. 



Savastano, Annuario R. Scuola Sup. d'Agric. in Portici^ 

 vol. v. fasc. 4, 1887. 



Voglino, / fungi Dannosi alle Piante Coltivate, i pi. 

 Pierce, Journ. MycoL, vol. vi. No. 4, p. 148, 2 pi. 



