CIRCULAR 2 3 7, U. S. DEPARTMENT OF AGRICULTURE 



localities, however, if the spraying is delayed until beetles appear on 

 the trees, it is often difficult to prevent injury. In Burlington County, 

 N. J., the first application should be made the latter part of June ; it 

 should be made somewhat earlier in localities farther south and some- 

 what later in localities farther north than Burlington County. 



To obtain satisfactory protection, all portions of the trees must 

 be kept covered with the spray (fig. 8) , as any unprotected portion of W 



Figure 4. — Horsech^stnut injured by the Japanese beetle. 



the foliage, blossom, or fruit will be selected by the beetle for attack. 

 The spraying must be more thorough than is sometimes done for the 

 control of other orchard and shade-tree pests. Figure 9 illustrates 

 the type of deposit necessary to obtain protection from the Japanese 

 beetle. If heavy rains occur after the application, it may be necessary 

 to repeat the spray. 



