DISEASES OF PLANTS. 80 1 



very little, while in the other 90 per cent of the tubers of the checked 

 plat were affected by the scab. In these experiments thelysol solution 

 gave the best results, followed by corrosive sublimate. The use of for- 

 malin gave very unsatisfactory results, quite at variance with the 

 results of J. 0. Arthur at the Indiana Station (E. S. R., 9, p. 450). 



Brief notes are given of the injury done to roses by growth of mucor, 

 and on the leaf spot of celery. 



Experiments were also conducted with the fungus parasite of the San 

 Jose scale, from which it appears that this parasite (SphceropMla cocco- 

 phila) can not be looked upon as a practical preventive of the scale in 

 southern Ontario. 



Experiments were conducted with corrosive sublimate, kainit, nitrate 

 of soda, potassium sulphid, formalin, and lysol for the prevention of 

 bean anthraenose. One and one-half per cent solutions of lysol gave 

 satisfactory results, followed by formalin and potassium sulphid. If 

 further trials of these fungicides should corroborate the results given, 

 lysol would supersede copper sulphate as a preventive of bean anthrae- 

 nose, as the results obtained are more satisfactory than those in former 

 experiments with copper sulphate. 



Rust in wheat during the dry season of 1897, D. Mc Alpine ( Agr. 

 Gaz. New South Wales, (1898), No. 12, pp. 1421, 1422).— Notes are given 

 of a number of specimens of wheat that were submitted to the author to 

 ascertain the presence of rust. The season had been an exceedingly 

 dry one and was considered unfavorable for rust growth, but the speci- 

 mens showed the presence of a few rust pustules and associated with 

 them were 2 saprophytic fungi (Cladosporium herbarum and Septoria 

 glumarum). 



As bearing on Eriksson's hypothesis (E. S. R., 9, p. IIS) of the exist- 

 ence of a symbiotic mycoplasma in wheats whereby the rust is carried 

 from one crop to another, the author states that he grew seed of 10 

 varieties of wheat that had been sent him from Sweden by Eriksson 

 and although they were all attacked by either one or both of the native 

 species of rust, they were entirely free from the yellow rust (Puecinia 

 glumarum), the rust which attacks wheats most severely in Sweden. 

 This evidence, though not conclusive, on account of the fact that the 

 variety of wheat was selected as one resistant to the yellow rust, seems 

 to be somewhat opposed to the theory advanced by Eriksson. 



The treatment of sooty mold (fumagine), L. Degkully (Prog. 

 Agr. et Vit, 30(1898), No. 52, pp. 749-751). — The author mentions various 

 attempts to control this disease. Among the winter treatments recom- 

 mended are spraying with kerosene emulsion and the use of sulphuric- 

 acid washes. It is stated that during the past season in Gironde a solu- 

 tion composed of water 100 liters, fat lime 1^0 kg., and crude petroleum 

 10 kg. was used. Another formula said to have been used with success 

 was crude petroleum 5 kg., crude naphthaline 8 kg., quick lime 25 kg., 

 and water 100 liters. The author believes that the absolute efficiency 

 of these solutions has not yet been established, and has made arrange- 

 ments to have them tested on a greater scale. 



