The Speating of Okohards. 293 



No beneficial results seemed to follow the use of formula (a), possibly 

 from the fact that the solution was at first too weak. None of the 

 foilage was injured. 



Formula (b) gave little better results. The quince and dewberry 

 plants seemed to have healthier foliage where they were sprayed, but 

 injury from fungi was scarcely reduced more than 25 per cent 

 at the most. 



Zinc chloride, when used according to the formulas given above, is 

 not a fungicide which can be applied with profit. 



iVb. 6. — Ziric sulphate. — The following formulas were used: 



(a) Zinc sulphate, 3 ounces. 

 Water, 26 gallons. 



(b) Zinc sulphate. 3 ounces 

 London purple, 1^ ounces. 

 Lime, 1 pound. 

 Water, 25 gallons. 



The varieties of plants treated were the same as the preceding, but 

 the apples used were Mc Intosh Red, The advantages derived from 

 the applications were so slight as to be practically of no value. 

 It is probable that greater quantities of the sulphate are necessary. 

 None of the foilage was injured. 



Zinc sulphate has thus far proved of no practical value as a fungicide. 



iVb. 6. — Lead acetate. — The formulas according to which this 

 material was used were similar to the preceding. 



(a) Lead acetate, 3 ounces. 

 Water 25 gallons. 



(b) Lead acetate, 3 ounces. 

 London purple, 1^ ounces. 

 Lime, 1 pound. 

 Water, 25 gallons. 



In this variety of apple was Maiden Blush for formula (a), and Ben 

 Davis for formula (b). The other varieties were the same as those 

 previously mentioned. No marked results followed the treatments. 



Lead acetate did not materially reduce the injury done by fungi to 

 the foilage of the treated plants. 



iVb. 7. — Fostite. — Analysis of this power made by Mr. Cavanaugh, the 

 assistant Station chemist, shows it to contain about 2 per cent of cop- 

 per, but the form in which it is found has not yet been determined. 

 The bulk of the powder is composed of soapstone, or steatite, which 

 certainly has the power of adhering to foilage a long time, especially if 

 it is applied while wet. It is the intention to give a complete analysis 

 of the substance in the near future. 



