86 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 12 



Hawaii, and as I recall lights were placed around valuable plants at 

 night to keep the insects away. It seems that the adults do not feed 

 after midnight and the lights are then extinguished. 



Mr. W. H. Goodwin: I won't vouch for this translation at all, but 

 what is translated from the Japanese is that they were strongly at- 

 tracted by lights, and that was one of the ways of catching the beetles. 

 With us, trap lights were a complete failure. I have found beetles 

 repeatedly within ten to twelve feet of lights that are only four feet 

 above the ground, and they were not the least bit disturbed or attracted 

 by the strong light. 



Vice-President E. C. Cotton : I would Hke to asjc Mr. Goodwin if 

 he has tiied other soil fumigants. 



Mr. W. H. Goodwin: We used carbon bi-sulphide on azaleas, and 

 got serious injury. That soil is sandy and loose, and makes it extremely 

 difficult to get any satisfactory results with carbon bi-sulphide unless 

 the soil is very wet. 



Mr. J. G. Sanders: In the case of some of our closely allied Ameri- 

 can beetles, they fly long distances, and they quickly retire. I wonder 

 if it is the same with the Japanese beetle. 



Mr. W. H. Goodwin: You can occasionally follow them with field 

 glasses. They seem to settle within a few hundred feet. They simply 

 riddle flowers, hollyhocks, and things of that sort, and roses. They 

 simply chew them up, in other words. They are such general feeders 

 that it makes the problem much more complicated because they will feed 

 on any plant, except grass and corn, and a few things like that. They 

 bore into the ends of corn ears, going down around the silks, and there 

 is where the danger comes in transporting them, when that corn is cut 

 and carried into the markets. 



Vice-President E. C. Cotton: The next paper is entitled, "The 

 Discovery of the European Potato Wart Disease in Pennsylvania, " by 

 Mr. J. G. Sanders. 



THE DISCOVERY OF EUROPEAN POTATO WART DISEASE 

 IN PENNSYLVANIA 



(Plate 3, figure 2.) 

 By J. G. Sanders, Economic Zoologist, Harrisburg, Pa. 



The discovery of the European potato wart disease ^ in Luzerne 

 County, Pennsylvania, late in September, 1918, was a distinct surprise 

 to all whose interest is concerned in such matters, although a constant 

 watch has been maintained for the appearance of this dangerous pest 

 within our borders for several years. 



^ Chrysophlyctis endobiotica Schilbersky. Described in 1896. 



