204 



AGRICULTURE FOR COMMON SCHOOLS 



4. Pyrethrum is dusted on when the leaves are damp or 

 may be used as a spray at the rate of an ounce to two gallons 



of water. When 



not in use the 

 powder should 

 be kept in an air- 

 tight can. This 

 powder will kill 

 currant - worms, 

 cabbage - worms, 

 and many others. 

 5. Whale - oil 

 Soap is a good 

 remedy for San 

 Jos^ and other 

 scales. It is used 

 at the rate of two 

 pounds of soap 

 to one gallon of 

 water. The soap 

 should be thor- 

 oughly dissolved 

 and applied as a fine spray. It kills by contact. 



6. Kerosene Emulsion is widely used for soft-bodied insects 

 like plant-lice and many kinds of scales, as well as hard- 

 bodied insects. It is made by dissolving a half-pound of hard 

 soap in one gallon of water (soft water is best). While still 

 hot, two gallons of kerosene should be added and thoroughly 

 churned with a force-pump, or stirred with a stick, until the 

 mass is like cream. It will take several minutes to do the 

 mixing right. If small quantities are wanted the above 



RESULTS OF NOT SPKAYIXG 



The crop of one tree. The piles of good and poor fruit 

 are about equal in this case. 



By courtesy of the Ohio Experiment Station 



