JOURNAL 



OF 



ECONOMIC ENTOMOLOGY 



OFFICIAL ORGAN OF THE ASSOCIATION OF ECONOMIC ENTOMOLOGISTS 



Vol. 1 ^ APRIL, 1908 No. 2 



Proceedings of the Twentieth Annual Meeting of 

 the Association of Economic Entomologists 



( Continued fro7n February number) 

 A paper was next presented by Mr. Forbes : 



EXPERIMENTS WITH REPELLENTS AGAINST THE 

 CORN ROOT-APHIS 



By S. A. Forbes, JJrhana, III. 



(Abstract.) 



In consequence of reports from farmers of beneficial results of the 

 use of kerosene on seed-corn, a strip through a large field was planted, 

 in 1905, with seed which had been soaked in kerosene, and as a result 

 a considerable percentage of the seed was damaged, though the plants 

 were protected for some weeks against injury by the corn root- 

 aphis. On the supposition that the latter effect was due to the odor, 

 experiments were made during the winter of 1905-06 with carbolic 

 acid, oil of lemon, formalin, minimum quantities of kerosene, and a 

 variety of other volatile oils and odoriferous substances, from which 

 the four above mentioned were selected for trial in the field. The 

 kerosene was used at the rate of a teaspoonful to a gallon of com, 

 thoroughly stirred in just before planting, the oil of lemon as a 10% 

 solution in alcohol, and the carbolic acid and the formalin as 3% so- 

 lutions in water. Three ounces each to a gallon of corn were used of 

 the oil of lemon mixture and the carbolic acid solution, and six ounces 

 to the gallon of the solution of formalin. 



Strips of twelve to twenty-four rows each and eighty rods in 

 length were planted with treated seed, intervening strips being left as 



