114 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



curled leaves each. The representation is correct, except that the 

 axis of each of the curled twigs is shortened in order to admit the 

 inclusion of the four twigs in one figure. 



In California, where peaches are grown in practically all parts 

 below 4000 feet, and especially in the foothills of the Sierras and the 

 broad valleys of the Sacramento and San Joaquin, great faith is placed 

 in Bordeaux mixture, which is stated to afford complete control either 

 when applied just when the buds begin to appear or when the trees 

 have been sprayed with a very strong Bordeaux mixture in December 

 for blight.* Bordeaux mixture has been found to be effective in New 

 Zealand, t and testimony to its beneficial action occurs repeatedly in 

 the reports issued by the New Zealand Department of Agriculture. 



But a distinct advantage of Burgundy over Bordeaux from a 

 fungicidal point of view in the treatment of peach curl was claimed 

 by George Quinn in Australia. { Quinn, whose experiments 

 on an extensive scale extended over three years, tested a number 

 of mixtures, including Burgundy, Bordeaux, lime-sulphur, Woburn 

 Bordeaux, Bordeaux powder, copper solution, &c, and found that 

 Burgundy mixture prepared from the raw materials excelled all. 

 The present season's experience at Wisley supports in a remarkable 

 manner Quinn 's results. 



In " Diseases of Cultivated Plants and Trees " Masse e advises 

 that " the only certain method of eradicating this disease is by 

 removing all infected shoots. Spraying with Bordeaux mixture 

 has many advocates, but the fact remains that the perennial 

 mycelium present in the shoots produces a crop of diseased leaves 

 each year, in spite of spraying. Spraying will undoubtedly prevent 

 infection from spores, but if the cause of infection is removed by 

 cutting away infected shoots no spores would be forthcoming to 

 infect healthy shoots." At Wisley, pruning, however thoroughly 

 performed, failed to rid us of this pest and failed even to check the 

 amount of curl to any considerable extent ; spraying, on the other 

 hand, actually prevented the appearance of a crop of curled leaves. The 

 mind has been too strongly intent on the infection of the leaves 

 from mycelium in the shoot, a method regarded by Arnaud as of 

 comparatively small importance — an opinion supported by practical 

 results in many countries. We are more concerned with what the 

 fungus actually does than with what it can or may do. 



Burgundy mixture should be given a fair trial in this country, 

 since the mixture is easily prepared, the ingredients are easily obtained 

 and easily stored — important practical advantages over Bordeaux ; 

 moreover, the mixture has little action upon the operating parts of 

 the spraying machine, being free from gritty particles, which in the 

 case of Bordeaux mixture exert a wearing action on the apparatus. 



* C. F. Collins' address to the State Fruit-growers' Convention, San Jose, 

 Cal., Dec. 2-4, 19 13. 



j W. A. Boucher, N.Z. Dep. Agric, Div. Biol., Tenth Report, 1901-2. 

 } G. Quinn, Jour. Dep. Agr. S.A. xviii. (Aug. 1914), pp. 32-37. 



