DISEASES OF PLANTS. 245 



not very prevalent and was not here associated with melanose, which was 

 elsewhere noted in one instance. The latter disease was sometimes associated 

 with Maori on fruit, weak lime-sulphur wash being recommended in such 

 cases. Some other troubles of fungus or insect origin are discussed, and 

 numerous fungicidal formulas or other treatments are given. 



The pathological significajice of the endocellular fibers in the tissues of 

 grapevines, L. Petri (Atti R. Aoad. Lincei, Rend. CI. Sci. Fis., Mat. e Nat., 

 5. ser., 22 {1913), II, No. 4, pp. 174-179, fig. i).— Referring to the contribution 

 of Mamell (E. S. R., 29, p. 551), the author states that the formation of 

 endocellular fibers always precedes by one or more years the external mani- 

 festations characteristic of roncet, but that their presence is not always fol- 

 lowed by the appearance of this deformation in chronic form. It is considered 

 inadmissible to conclude without ade^iuate experimentation that vines showing 

 these endocellular fibers are really free from incipient roncet. 



Reply to L. Petri regarding endocellular fibers and roncet of grapevines, 

 Eva I*Iameli (Atti R. Accad. Lincei, Rend. CI. Sci. Fis., Mat. e Nat., 5. ser., 

 22 {1913), II, No. 11, pp. 604-607). — Discussing the above article, the author 

 states that she has found the endocellular fibers in question in perfectly sound 

 Individuals representing numerous species of dicotyledons, including normal 

 grapevines under very diverse conditions of cultivation and climate. 



More on the pathological significance of the endocellular fibers in tissues 

 of grapevines, L. Petri (Atti R. Accad. Lincei, Rend. CI. Sci. Fis., Mat. e Nat., 

 5. ser., 23 {1914), I, No. 3, pp. 154-161, fig. i).— This is an argumentative review 

 of the articles above noted and of other contributions cited. 



Diseases affecting pecan trees, H. K. Millee {Amer. Fruit and Nut Jour,, 

 7 {1913), No. 99, pp. 12-14, fios- 2). — The author, giving the results of experi- 

 ence with pecan diseases in Florida, states that the blight causing leaf fall of 

 young seedlings can be controlled by spraying with Bordeaux mixture every 

 10 or 15 days during foliation. Pecan scab {Fusicladiiim cffusum), attack- 

 ing nuts, leaves, and twigs, is said to be worse on pecan stock from Texas, and 

 in wet than in dry seasons, also probably on trees weakened by cutting for 

 grafts and bud wood. The application of lime sulphur to dormant trees and 

 of Bordeaux mixture to trees in foliage is recommended, and sanitary cultiva- 

 tion is insisted upon. 



Rosette is considered as due to malnutrition, perhaps in most cases caused 

 by soil acidity or the character of the fertilizer employed. The use of ground 

 limestone or Thomas slag has corrected the conditions and given good results 

 in cases mentioned. Other factors and other remedies are suggested. 



Winterkilling is considered as caused by sudden cold in autumn or spring, 

 by cutting away too severely in taking bud wood, or by defoliation in early fall 

 in case of attack by webworms. Orchard practice tending to induce early 

 dormancy in autumn or late foliation in spring is recommended. 



Immunization of hollyhock against rust, J. Eriksson and C. Hammab- 

 LUND {Compt. Rend. Aead. Sci. [Paris], 158 {1914), No. 6, pp. 420-423) .—Results 

 of previous work by Eriksson on hollyhock rust {Puccinia malvacearum) (E. S. 

 R., 25, p. 850) having raised the question as to the possibility of weakening 

 more or less the internal mycelium by the use of fungicidal solutions in water- 

 ing the plants, tests were carried out with copper sulphate of from 1 to 10 per 

 cent strength in 1912 and 1 to 5 per cent in 1913. 



From the tabulated results it appears that a strength of even from 1 to 3 

 per cent is sufficient to limit greatly the development of the fungus, all of the 

 new leaves in many cases proving to be free from rust. It is therefore claimed 

 that this parasite may be greatly checked or controlled by the application of a 

 fungicide through the roots. 



