118 MAINE STATE COLLEGE 



by continual agitation. This mixture is not recommended for gen- 

 eral use. 



Where to Procure the Chemicals. 



The ingredients of the modified eau celeste, may all be obtained 



at any local drug store. If any considerable quantity is to be 

 used, however, it is much cheaper to send to some reliable whole- 

 sale house and buy in bulk. For this reason it is well for farmers 

 to club together in securing a supply of chemicals. Carbonate of 

 copper is not usually handled by local dealers, and in ordering, it 

 is well to specify that the precipitated form is desired. 



The following firms are named as reliable parties who will 

 supply the various materials at a reasonable cost : 



Weeks & Potter Co.. Washington street, Boston. 



Eimer & Amend. 20a Third Avenue, New York. 



W. S. Powell & Co.. 202 Bowley's Wharf, Baltimore, Md. 



Some dealers offer the ammoniated copper carbonate, "copper- 

 dine." ready for use by diluting with the proper amount of 

 water. In this way less labor is required in preparation, but the 

 ingredients are much more costly. 



Sr nMM ART . 



1. Apple scab is caused by the attack of a parasitic plant — 

 a fungus. 



2. The fungus attacks the leaves and young twigs, as well 

 as the fruit, and may seriously injure the tree. 



3. The attack is most severe in cool, moist seasons. 



4. Spraying with certain compounds of copper will hold 

 the fungus in check. 



5. In some cases the amount of No. 1 fruit on the sprayed 

 trees exceeded, that on unsprayed trees by 65 per cent, while 

 the average increase of salable fruit was more than 50 per 

 cent. 



6. There appears to be little difference in effectiveness 

 between the ammoniacal solution of copper carbonate, and 

 modified eau celeste. 



7. Three ounces copper carbonate dissolved in one quart 

 ammonia gave better results than did a smaller proportion. 



8. Carbonate of copper in suspension appears to be of no 

 value as a fungicide. 



9. The cost of spraying with eau celeste or the ammo- 

 niacal solution of copper carbonate, is about three cents per 

 tree for each application. 



