274 STATE BOARD OF AGRICULTURE. 



Study carefully the nature of the insect or disease and select the 

 remedy that is most likely to destroy it without injuring the plants. 



Do "not spray while the trees are in blossom, as the bees will be de- 

 stroyed; they are necessary to fertilize the flowers. 



Pumps for the application of insecticides and fungicides should be 

 suificiently powerful to cover the trees or. plants with a fine mist, and 

 where copper compounds are to be used, the working parts should be 

 of brass, and if all portions that are to come in contact with the spray- 

 ing mixture are of brass, the durability of the pump Avill be greatly in- 

 creased, except when the sulphur, lime and salt wash is used. For this 

 an iron pump is better. It should have metal valves and should be 

 rinsed out each day when through spraying. ^ 



