FUNGICIDES 35 



was used. Nevertheless, the effect produced is perhaps 

 sufficient to forbid its use in private or public parks or 

 gardens, or conservatories. On the other hand, to the 

 horticulturalist or fruit-grower, where appearances can be 

 ignored, Bordeaux mixture is at once the most effective 

 and cheapest fungicide that can be used. 



As a typical illustration of the value of spraying with 

 Bordeaux mixture, the following is taken from Bulletin 

 No. 7 of the United States Department of Agriculture, 

 entitled, ' The Effect of Spraying with Fungicides on the 

 Growth of Nursery Stock.' 



Seedlings or grafted stocks of pears, cherries, plums, 

 apples, etc., are subject to various fungous diseases which 

 attack the foliage, causing the latter to fall prematurely, 

 and as a result the following are some of the effects pro- 

 duced : — (i) In the case of seedlings the active wood ripens 

 so that the buds cannot be inserted, or if they are inserted 

 the union with the stock is imperfect, and in consequence 

 the bud eventually dies ; (2) if the bud or graft should 

 grow, its development is checked by the annual early loss 

 or drying-up of its leaves. This brings about a stunted 

 development, from which it is doubtful if the tree ever 

 recovers. 



The experiments were conducted on a large scale, and 

 continued for three consecutive years, each tree being 

 sprayed five times each year. An equal number of un- 

 sprayed trees, growing under similar conditions, afforded 

 the basis from which the following conclusions were made. 



The cost of treating nursery stock with Bordeaux 

 mixture, the only preparation that can be unqualifiedly 

 recommended, need not exceed 25 cents per 1000 trees 

 the first season. The second year the cost of the work 



