350 CONTROLLING INSECTS AND DISEASES 



matter of seconds. The operator must be agile in order both to 

 do a good job and to conserve material. 



Trees not exceeding in size a commercial peach tree may 

 be dusted from one side of the row when dusting conditions are 

 good. It is good practice, however, to put on the different 

 applications from alternate sides of the row. Thus, if the first 

 application is made from the east side, put on the second from 

 the west. 



Large trees should be dusted from both sides. Split ap- 



{Mich. Exp. Station) 



Fig. 135. Dusting at twilight. The air is still. Note how the dust 

 hovers in the tree at the right. 



plications are sometimes made, that is, dusting one side when 

 conditions are right, and dusting the other side a few days 

 later when the drift of the wind is in the opposite direction. 

 Under such conditions about half the material needed to cover 

 the tree completely is used at each application. Nicotine dusts 

 should be put on in a single application to secure most effective 

 control. 



An upward and downward sweep of the discharge pipe with 

 a horizontal stroke across the top gives an even coverage with 



