66 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 15 



Satisfactorv' progress has been made in the testing of arsenical spray 

 materials against the beetle, and a paper presented at this meeting by 

 William Moore reports on these investigations. Briefly it may be 

 said that arsenate of lead alone repels the beetle because of the toxic 

 symptoms resulting from the insect eating some of the arsenical. Arse- 

 nate of lead alone, because of this fact, does not kill a sufficient proportion 

 of the beetles to result in satisfactory control. In addition to arsenicals 

 various other materials of more or less insecticidal value have been 

 tested out and while a great deal of data has been accumulated and 

 some progress has been made in the development of spray materials 

 other than arsenicals, it is not desirable at this time to make a further 

 report. 



Field Work 



A considerable amount of large scale experimental spraying has been 

 conducted during the past season and data accumulated on the results. 

 It is believed that during the coming season large scale demonstrations 

 can be carried on to demonstrate the fact that injury from the Japanese 

 beetle can be reduced to a very great extent by proper methods. No 

 further work has been done with large scale control work, such as 

 cyaniding, because of the excessive cost and questionable final value 

 of this type of work. 



Summary 



To simimarize, it m.ay be said that the work under way against the 

 Japanese beetle is progressing satisfactorily. It may be said that the 

 enforcement of the quarantine regulations so far has been presumably 

 effective in preventing long distance spread of the insect, it appearing 

 that the spread so far constitutes the natural spread of an imported 

 insect in a new and exceptionally favorable environm.ent. 



The biological investigations including the parasite work have made 

 distinct and important progress. Much additional data have been 

 obtained regarding the habits and reactions of the insect in its present 

 environment, and definite steps toward the liberation and establish- 

 ment of natural enemies have been made. 



The studies and experiments with contact and stomach insecticides 

 for use against the grub and beetle stages of the insect have shown that 

 it is entirely possible to anticipate in the near future practical methods 

 of reducing the actual injury occasioned by this insect to a very con- 

 siderable extent. 



President Dean : The next paper is by William Moore. 



