NOTES AND ABSTRACTS. 



507 



of the appearance of affected plants in America, and of experiments 

 to discover the identity of the organisms responsible. 



1. Mosaic Disease can be induced by punctures with a needle 

 infected by diseased tissues. Apparently spread by means of green 

 aphids. Organism unrecognized. 



2. Root Rot. — Thielavia basicola placed on healthy roots in sterile 

 soil produces root disease, but it does not work up stems for more 

 than 3 inches, and therefore is thought to be distinct from the cause 

 of streak. 



3. Root Rot. — Rhizoctonia or Corticium vagum differs from the 

 following in its browning effects and frequently quite destroying 

 the roots ; also in Tomato, Lettuce, and Tobacco. 



4. Stem or Collar Rot. — Sclerotinia Libertiana affects seedlings, 

 attacking the collar. A soil organism affecting clover and introduced 

 with animal manure. 



5. Root Rots. — Fusarium species not yet identified. Seedlings 

 affected suddenly collapse ; the central woody region of roots easily 

 pulls out from bark. 



6. Root Galls due to the eel-worm, Heterodera radicicola. — A 

 common greenhouse trouble. Affect many other plants ; form galls 

 smaller and longer than the normal root nodules. 



7. Bud Drop. — Due to too highly nitrogenous food. Application 

 of phosphoric acid and sulphate of potash cured within a week. 



8. Anthracnose. — Glomerella rufo-maculans also causes bitter 

 rot of Apple. May attack seedlings ; spreads rapidly in the field ; 

 can be carried to Peas from Apple. 



9. Powdery Mildew. — Erysiphe polygoni, according to Massee, so 

 far not identified in America. Occurs in greenhouse and on low 

 wet land. — E. A. B. 



Sweet Pea : Streak in Sweet Peas and Clover. By T. F. Manns and 

 J. J.Taubenhaus (Gard. Chron. April 5, 1913, p. 216). — Describes ex- 

 periments resulting in the isolation of, and successful cross-inoculation 

 with, a new species of Bacillus named B. lathyri by the authors, and 

 considered by them the cause of Streak disease in Sweet Peas. 



E. A. B. 



Sweet Peas, Winter-flowering. By P. Schmidt (Oestr. Gart. 

 Zeit. vol. vii. pt. xi. pp. 425-428). — Sow the seed of Lathyrus- odoratus 

 praecox in boxes in the middle of July, transfer the seedlings in the 

 middle of August to the border in the greenhouse, enriching the soil 

 with well-decayed cow-dung. The temperature of the house should 

 not exceed 55 0 F. The flowers will be ready for cutting at Christmas. 

 The best varieties are : ' Christmas Meteor,' scarlet ; ' Christmas Pink,' 

 white and pink ; ' Flamingo,' scarlet ; ' Florenze Denzer,' pure white, 

 one of the best ; ' Greenbrook,' white, with lavender edge ; * Le Marquis ' 

 and « Mrs. C. H. Totty,' blue ; ' Mrs. Dolansky ' and ' Mrs. Will. Sim,' 



