JOURNAL OF ECONOMIC ENTOMOLOGY 



OFFICIAL ORGAN AMERICAN ASSOCIATION OF ECONOMIC ENTOMOLOGISTS 



JUNE, 1922 



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The utility of large scale control work is likely to be tested in a most 

 searching manner within the next few years, particularly in relation 

 to the possibilities of checking the spread or controlling such insects 

 as the Japanese beetle, the European Com Borer and the Gipsy Moth. 

 The first nam-cd presents an exceedingly difficult problem, since the adult 

 is very resistant to poisons and flies readily while the subterranean grubs 

 are nearly inaccessible. The European Com Borer, although it was 

 presum.ably brought into the country only about ten years ago, has 

 become thoroughly established over considerable areas and here there 

 may be aknost unsuspected nattiral agents which have greatly facili- 

 tated the dissemination of the insect, not to mention the slow and 

 practically inevitable spread due to what may be considered the normal 

 flight of the insect. There is, furthermore, the gigantic problem of 

 effectively preventing spread by artificial agencies along very extended 

 lines of defense. The Gipsy Moth with its relatively slow increase 

 now presents a condition somewhat analogous to that of the European 

 Com Borer in that the border line of the infested area has become 

 greatly extended with indications of still greater expansion by normal 

 spread, not to mention the danger of transportation by commercial 

 agencies. There are obvious li.mits to artificial m.ethods of checking 

 dissemination and the same is true in a general way at least in relation 

 to the size of areas over which broad scale, repressive measures can be 

 conducted economically. Questions in relation to the control of these 

 insects and also as to the value of different quarantine measures are 

 becoming more insistent with the increase in infested areas and in the 

 case of certain of the above mentioned species at least, there must soon 

 be a determination of the practical hm_itations and m_odifications in 

 policy to meet the changed conditions. 



