DISEASES OF PLANTS. 455 



It is claimed that the use of diseased seed tubers is mainly responsible for the 

 spread of the disease, which not only causes losses to the growing crop but 

 much heavier ones during storage. 



A bibliography is appended. 



Experiments on the spraying of potatoes in Cdunty Louth, A. W. Older- 

 SHAW (Dept. Agr. and Tech. Instr. Ireland Jour., 11 {1911), No. 3, pp. /i.50-456). — 

 The results are given of experiments conducted during 1908 to 1910 on the 

 efficacy of various Bordeaux mixtures in controlling the late blight of the potato. 



Soda and lime Bordeaux mixture and Woburn Bordeaux paste were used in 

 the experiments. The Woburn Bordeau paste proved to be inferior to both the 

 soda and the lime Bordeaux mixture. 



Experiments on the influence of fertilizers on the leaf-roll disease of the 

 potato and on the yield of tubers, Ostekspen (Mitt. Dent. Landw. Gesell., 

 26 (1911), No. 18, pp. 222-22^). — In experiments with stable manure and com- 

 mercial fertilizers the leaf-roll disease was found to be worse on the unfertilized 

 plats. It was also very serious on plats which contained no potash, and to a 

 less extent on the plats which contained no phosphoric acid, while on the plats 

 fertilized with stable manure and with a complete fertilizer containing nitrate 

 of soda, potash, and phosphoric acid the outbreak of the disease was checked. 

 The yield was found to be increased materially on all the fertilized plats as 

 compared to the check plats. 



Sooty mold of tobacco, E. Inglese (BoL Tec. Coltiv. Tabacchi [Scafati], 

 10 (1911), No. 2, pp. 81-89). — The author describes the characters of this mold 

 (Fwmago vagans), gives the conditions under which it is usually found on the 

 tobacco and the damage done by it, and suggests remedies for combating it. 



It ia claimed that the overrunning of the green parts of the tobacco plants by 

 this fungus diminishes the absorbing and transforming power of the plant, 

 thereby seriously affecting its photosynthesis and producing serious nutrition 

 disturbances. The use of nitrate of soda to increase the vigot of the plant and 

 spraying with tobacco decoctions to kill the aphids are the remedies suggested. 



The value of spraying fruit trees (Queensland Agr. Jour., 26 (1911), No. 

 5, pp. 266., 267). — ^Attention is called to a statement in the monthly report for 

 March on the fruit industry in the Stanthorpe district by J. Henderson, inspec- 

 tor under the Diseases in Plants Act, of the very favorable results obtained in 

 controlling the American blight on badly infected apple trees, by spraying the 

 trees several times during the winter months with a solution of red oil, fol- 

 lowed, after the foliage appeared, by a weak kerosene oil emulsion wash applied 

 with a brush to the cankers on the trunks and limbs missed by the red oil 

 spray. The trees were almost entirely freed from the disease with this treat- 

 ment 'and the wounds caused by the blight have healed up, leaving the trees in a 

 fine, healthy condition. 



Plum trees killed by Eutypella prunastri (Gard. Chroti., 3. ser., 49 (1911) , 

 No. 127/ji, p. 829). — Attention is called to the frequent killing of young plum 

 trees by this fungus in Cambridgeshire. The fungus girdles the bark of the 

 main stem, thus killing it. Older plum trees and apple trees are not killed by 

 the disease. 



Spraying experiments with peaches, M. A. Blake and A. J. Faeley (New 

 Jersey Stas. Bid. 236, pp. 3-30, pis. 12). — The results of observations and tests 

 conducted at Vineland during the season of 1910 with soluble sulphur solutions 

 are given, together with directions for the preparation and application of self- 

 boiled lime-sulphur mixtures for the control of peach scab. 



The mixtures used in these tests were commercial lime-sulphur (1 : 100, 1 : 125, 

 and 1 : 175) , home-boiled lime-sulphur (1 : 80, 1 : 100, and 1 : 125, specific gravity 

 7717°— No. 5—11 5 



