Notes and Brief Articles 



105 



The dreaded walnut blight, caused by Bacterium juglandis, 

 which is now widely distributed in America, has been introduced 

 with nursery stock into South Africa. According to Doidge, its 

 development is greatly favored by rain and mist in the early part 

 of the season, when many of the nuts drop from the trees. It 

 is carried over to the next season in leaves and in lesions on the 

 twigs. 



Market Pathology and Market Diseases of Vegetables is the 

 title of a very important paper contributed by Link and Gardner 

 to Phytopathology for November, 191 9. This study grew out 

 of cooperative work during the war to lessen waste in the crop 

 of vegetables after picking. After a general introduction, the 

 various vegetables are taken up in alphabetical order and the 

 principal diseases attacking each one are discussed. 



" Craterellus, Cantharellus, and Related Genera," by W. C. 

 Coker, with 25 pages and 17 plates, appeared in the Journal of 

 the Elisha Mitchell Scientific Society for October, 1919. Seven 

 species of Craterellus and twelve of Cantharellus are included for 

 North Carolina. The photographs and the drawings of the 

 spores are excellent, as usual. No novelties are described. 



The poplar canker, Dothichiza populea, was studied by Mr. 

 J. K. Primm in the vicinity of Philadelphia during the summer 

 of 191 7 and his results published the following year in the Journal 

 of Economic Entomology. The Lombardy poplar suffered most 

 severely, especially where the lower branches were pruned away. 

 The omission of pruning and care regarding drainage are recom- 

 mended for old poplar trees of all kinds. In the case of young 

 trees, it was discovered that the only nursery which was entirely 

 free from the disease was one that had been sprayed regularly 

 every winter with lime-sulphur mixture. 



The mosaic disease of sugar cane, which has been so destruc- 

 tive in Porto Rico, has recently been discovered in Louisiana and 

 other Southern States. A circular distributed by the Porto Rican 



