4 



CIKCULAK 317, U.S. DEPT. OF AGKICULTUBE 



protected from plant diseases and insect pests other than the Japa- 

 nese beetle by the regular spraying recommended for the various 

 localities. 



Timeliness and thoroughness in the application of the repellent 

 sprays are very important, xls a general rule, and especially in 

 localities where the beetles are very numerous, the first sprays should 

 be applied when the beetles begin to appear in the vicinity, before 

 they become established on the plants. < In localities where the infes- 

 tation is not so dense, the first application may be delayed until the 

 beetles begin to appear on the plants to be protected. However, if, 



in the heavily in- 

 fested localities, the 

 spraying is delayed 

 until beetles appear 

 on the plants, it is 

 often difficult to pre- 

 vent in j u ry. In Bur- 

 lington 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 somewhat 

 later in localities far- 

 ther north than Bur- 

 lington County. 



To obtain satis- 

 factory protection, 

 all portions of the 

 plants must be kept 

 covered with the 

 spray (fig. 6), as any 

 unprotected portion 

 of the foliage, blos- 

 som, or fruit will be 

 selected by the beetle 

 for attack. Kepel- 

 lent sprays will not 

 protect the unfold- 

 ing blooms of orna- 

 mental shrubs. If heavy rains occur after the application, it may 

 be necessary to repeat the spray. 



To apply the sprays properly to fruit and shade trees, and to high 

 ornamental shrubs, power-spraying equipment is necessary. The 

 high-pressure equipment in general use for the control of other insects 

 and diseases has been employed with satisfactory results. 



RECOMMENDATIONS FOR DIFFERENT PLANTS 



The sprays recommended in this circular have been tested for 

 several years and have been found to be the most satisfactory for 

 protecting the plants in connection with which they are mentioned. 

 All of the sprays leave some residue on the fruit at the time of harvest. 



Figure 4.— Elm tree injured by Japanese beetles. Note how the upper 

 and outer portions of the tree have been defoliated. 



