FUNGICIDES 39 



a more or less dense white felt on the surface of living 

 leaves, as the hop mildew (Sphaerotheca castagnei}. 



The finely powdered sulphur is dredged on the leaves 

 from a vessel resembling a large pepper-pot, or blown on 

 by means of specially contrived bellows or other apparatus ; 

 or frequently the primitive method of enclosing the sulphur 

 in a coarse canvas bag fixed to the end of a pole, which 

 serves as a handle, is used as a dredger. The leaves 

 should be damp when the sulphur is applied. 



In some instances better results follow when finely 

 powdered quicklime is mixed with the sulphur, taking care 

 to always have an excess of sulphur. Quicklime may also be 

 laid on the ground in the spring under perennial plants that 

 have suffered from disease and where sclerotia or other rest- 

 ing forms of reproductive bodies fall to the ground, as the 

 products of germination are frequently killed by the lime. 



Many other fungicides have been recommended for 

 special diseases, and their application might possibly be 

 extended with advantage in many instances. 



As the result of numerous experiments made with the 

 object of checking the destructive sooty mould infesting 

 orange and other citrous fruits, Mr. Webber, a member 

 of the U.S. Department of Agriculture, strongly recom- 

 mends the following, known as the resin wash : 



Resin . , . .20 pounds. 



Caustic soda (98 p.c.) . 4^ pounds. 



Fish oil, crude . . 3 pints. 



Water, to make . -15 gallons. 

 Boil the resin, caustic soda, and fish oil mixed with 

 water until the resin is dissolved, then make up to fifteen 

 gallons with water. This is the stock solution. To use, 

 add nine parts of water to one part of the stock solution. 



