Thk Bulletin. 35 



Some growers use even as high as 5 pounds of bluestone to the barrel 

 and are satisfied ; others use 4 pounds, while some who have noticed the 

 rusting effect on the fruit are not willing to use more than 2 pounds to 

 the barrel. After considerable observation on our own tests and consul- 

 tation with ofiicials of the United States Department of Agriculture, we 

 now suggest 3 pounds to the barrel to be used for any sprayings after 

 the young apples are well set — that is, for the fourth and fifth sprayings 

 as given on pages 29 and 30 of this Bulletin. Some manufacturers sell 

 ready-made Bordeaux preparations, but these have never come into gen- 

 eral use in this State. 



Stone lime (unslaked) 4 pounds. 



Bluestone 3 pounds. 



Arsenate of lead (paste) 3 pounds. 



Water 50 gallons. 



Put the bluestone in a cloth and hang it in a tub or keg of water so 

 that it is just below the surface. In this way it will dissolve much more 

 rapidly than if thrown in so that it sinks to the bottom. Warm or hot 

 water will dissolve it much more rapidly than cold. Put this to dissolve 

 the evening before it is intended to spray and it will be dissolved by 

 morning. This should be in a wooden receptacle. After the bluestone 

 has dissolved add water to make 25 gallons (if there is not that amount 

 already). 



Slake the lime slowly (preferably with hot water), and when com- 

 pletely slaked add water to make 25 gallons. Keep this in a separate keg 

 or barrel. 



We now have 25 gallons of bluestone solution and 25 gallons of the 

 lime solution. We now take equal parts of each of these solutions and 

 pour them together into a third tub or barrel. Do not pour a bucketful 

 of one into a half-barrel of the other, but mix them always in equal quan- 

 tities. Thus we may take two water buckets and fill one with the lime 

 solution and the other from the bluestone solution and then pour them 

 both at the same time into the third barrel or keg. This little point of 

 always mixing them in equal quantities results in a better mixture than 

 when they are carelessly mixed, or when the whole mass of one solution 

 is poured bodily into the whole mass of the other. Always stir the solu- 

 tion well before dipping out, so that the liquid you take out shall be fully 

 charged with the ingredients of the solution. 



Adding the Poison. — The arsenate of lead paste is first dissolved in just 

 enough water to make it liquid and is then stirred into the Bordeaux 

 Mixture. It is then ready to apply. If the powdered form of arsenate 

 is used, use only half the amount by weight. 



Strain Before Using. — Before using, the mixture must be carefully 

 strained through a cloth or fine wire gauze. Eemember that all the spray 

 must come out through the small hole in the end of the nozzle ; therefore, 

 to avoid clogging, strain carefully before using. Care in the thorough 



