EXPERIMENT STATION BULLETINS. 311 



CALCIUM BENZOATE AS A SPRAY. 



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We also made a rather unsatisfactory test of a combination of 

 Bordeaux mixture and Calcium Benzoate; the formula being in one 

 case one pound of Calcium Benzoate, one pound copper sulfate, one 

 pound lime and fifty gallons of water. The copper sulfate and lime 

 were first made into Bordeaux and the benzoate added afterwards. 

 This produces copper benzoate which is claimed to be good for con- 

 trolling fungous diseases of all kinds. Another formula only con- 

 tained one-lmlf pound each of copper sulfate and lime to one pound 

 of benzoate and fifty gallons of water. Our results this year did not 

 indicate that this Benzoate-Bordeaux would control the scab and in a 

 general way the results Avere inferior to those with regular Bordeaux 

 mixture. Due to the poor weather, we were not able to spray both 

 on the same day and the difference in the time of spraying might have 

 made a difl'erence in the results. To get definite results, we will have 

 to try the Benzoate combinations under more favorable conditions. 



Small lots of Grasselli's Bordeaux paste, a prepared Bordeaux, and 

 of their Bordeaux Arsenate of Lead Paste were received. They mix 

 with water about as well as arsenate of lead, but they do not stay in 

 suspension nearly as well as a properly prepared home-made Bor- 

 deaux mixture, and we did not get as good results as with the home- 

 made Bordeaux mixture and arsenate of lead, the arsenate of lead 

 being used at the rate of two pounds to fifty gallons of the Bordeaux. 



Cooper's fluid V 2, which is recommended as a summer spray for fruit 

 trees is similar in appearance to the Fluid V 1, except that it is a 

 lighter color. The results were quite unsatisfactory. The price of the 

 material would alone keep the fluid from being generally used. The 

 cost is the same as that of their winter spray, |1.50 for fifty gallons, 

 while home-made Bordeaux mixture costs only thiity cents for the 

 same quality. 



Thus far we have not found a substitute for the three great rem- 

 edies for the fruit tree pests: home-made Bordeaux mixture, home- 

 made lime-sulfur mixture and arsenate of lead. 



Frank A. Wilken. 



South Haven, Mich., December 21, 1908. 



