Methods of Control 401 



(d) The following are directions for the prepa- 

 ration of spray tanks and spray: 



1. Fill the 100-gallon spray tank about one-half 

 full of water. If the water used is too cold, upon 

 the addition of the stock solution the soap will 

 solidify into small lumps, thus spoiling the emulsion. 

 This may occur early in the spring, when the water 

 is very cold, but later in the season ordinary top 

 water may be used without danger of the soap solidi- 

 fying on the addition of the stock solution. 



2. Add stock solution made above. (See (c)| 

 1, 2, 3, 4, 5, 6.) 



3. Agitate. (If lumping occurs, the addition 

 of a few pails of hot water will remedy this.) 



4. Fill the 100-gallon spray tank. 



Fungicides 



These poisons are used to control fungous diseases. 

 As previously stated, some parasitic fungi live on 

 the surface of the leaves and stems and are therefore 

 easily controlled. An example of this is the powdery 

 mildew. Other fungi, and these are in the larger 

 majority, are those which live parasitically within 

 the tissue of the host, and therefore cannot be reached 

 by any spray. Fungicides are helpful only in pre- 

 venting entrance of the parasite in the host. They 

 are as ineffective in controlling insect pests as are 

 insecticides in controlling fungous diseases. 



The author has often referred in this work to the 

 term "standard fungicide." In reality there is no 



