October, 'llj HARTZELL: SWEETENED POISONS 419 



proved so successful, except in unscreened kitchens or dining rooms. 



This poison was tested in the large College mess-hall — where over 

 four hundred students can be seated — resulting in practically cleaning 

 up all the flies in two days. Previous to that time the steward had 

 been using tanglefoot fly paper, often having as many as thirty sheets 

 exposed. Fully that number were present when the formalin was 

 used, but in spite of them the flies were numerous. 



Entomologists are aware that formalin as a fly poison has been 

 condemned many times, especially so last year, as I am advised by 

 Edward Hatch, Jr., chairman of the Fly- Fighting Committee of the 

 American Civic Association. It is partly for this reason that I have 

 taken so much space in recording my results with formalin. 



West Raleigh, N. C, September 7, 1911, 



THE USE OF SWEETENED POISONS AGAINST THE GRAPE 

 ROOT-WORM AND THE ROSE CHAFER 



By F. Z. Hartzell 



Entomological research at the Vineyard Laboratory has been con- 

 fined largely to exhaustive studies of a few of the more important 

 insects infesting the vineyards in Chautuaqua county, N Y. Two 

 species have been responsible for much loss during the last decade: 

 the grape root-worm {Fidia viticida Walsh) and the Rose Chafer (Mac- 

 rodadylus suhspinosus Fabr.) Both of these insects have been studied 

 extensively by a number of entomologists in the various grape regions 

 of the U. S. and our literature details the several remedial measures 

 that have been used. 



The author reported experiments conducted against these jDcsts 

 during 1909-10.^ During the present season these have been con- 

 tinued and additional data secured which confirms his first claims as 

 well as shomng that even better results may be secured by the use 

 of two gallons of molasses where one was used before. 



Grape Root-worm. This is the most important insect of the 

 vineyards on the south shore of Lake Erie where it has been known since 

 1893 when Prof. F. M. Webster gave the first account of its destruc- 

 tiveness and later published its life history. Since then it has been 

 studied by others especially by Prof. Slingerland, Dr. Felt, Messrs. 

 Fred Johnson and A. G. Hammar, so that we have in addition to its 

 life history, much data regarding the periods of abundance and 



> A Preliminary Report on Grape Insect, F. Z. Hartzell, Bull. 331, N. Y. Agr.. 

 Expt. Station, Geneva, N. Y. 



