292 Agrioultukal Experiment Station, Ithaca, N. Y. 



Copper chloride possesses some value as a fungicide. It can not be 

 used alone, however, without injuring foliage, and lime must be added 

 to destroy its caustic properties. It is probable that two or three 

 ounces in twenty-five gallons of water is sufiiciently strong to give 

 good results. When used at the rate of an ounce to twenty-five 

 gallons of water it reduced the injury from fungi 50 per cent upon 

 the dewberries, and 35 per cent on the quinces. When used 

 twice as strong the injury was reduced 75 per cent and 80 per cent 

 respectively. At the same time the foliage was uninjured by 

 the application, even though London purple had been added. These 

 results are encouraging for if a fungicide can be found which will 

 equal the Bordeaux mixture, and still be easy of application, much of 

 the trouble which now accompanies spraying will be avoided. 



Copper chloride can not be used as a fungicide to advantage unless 

 the solution is so strong that lime is required to neutralize its caustic 

 action. On the whole it is a promising fungicide. 



No. 3. — Iron Chloride. — The chloride of iron was applied to the 



same varieties of plants mentioned under No. 1. The following is 



the formula used : 



Iron chloride, 3 ounces. 



London purple, 1^ ounces. 



Lime, 1 pound. 



Water, 26 gallons. 



The beneficial action of this chemical was so slight that ilo definite 



improvement in the foliage could be seen. The quinces were 



apparently not benefited, but upon the dewberries the leaves of the 



sprayed plant seemed to be a trifle more free from fungous attack than 



the check plants. The combination possessed no caustic properties. 



The experiments of the past season show no practical benefit derived 



from applications of iron chloride. 



No. 4. — Zinc chloride. — This chemical was applied both alone and 



with lime and London purple. 



(a) Zinc chloride, 1 ounce. 

 Water, 25 gallons. 



(b) Zinc chloride, 3 ounces. 

 London purple, 1-^^ ounces. 

 Lime, 1 pound. 

 Water, 25 gallons. 



Formula (a) was used for the first four treatments, the last two con- 

 taining three ounces of the chloride instead of but one. The same 

 varieties of plants mentioned under No. 3 were used, except that the 

 apple ti*ee was a Westfield Seek -no-further. 



