June, '21] 



HEADLEE: BEAN WEEVIL AND MOISTURE 



263 



To determine the effect of soap on the hoppers when no poison was 

 used, one lot was confined in a screen cylinder cage and fed green com 

 and bran treated with soap. A check lot was fed on green com alone 

 and the death rate in the check was more rapid than in the case 

 of the soap fed lot. Another season it is intended to give this a thor- 

 ough test and also determine if possible, just what ingredient of soap 

 is so attractive. 



As for repellents, the copper sulphate is easily the most promising, 

 kerosene coming second. It was noted during the progress of the ex- 

 periment that while some few hoppers and crickets were counted near 

 or on the bait treated with copper sulphate, it was very rarely indeed 

 that any feeding was done. This was also true to a less extent in the 

 case of kerosene. 



By a comparison of the counts and influenced somewhat by the be- 

 havior of the hoppers as otherwise noted during the progress of the 

 experiment, the various materials can be listed in order of their repel- 

 lent qualities, as follows, the most repellent being placed last: soap, 

 black strap, water, gasoline, sulphur, aloes, creosote oil, furniture pol- 

 ish, nitrobenzine, nicotine sulphate, auto oil, kerosene and copper sul- 

 phate. vSince the first three and the last two mentioned were run in 

 three series together, it is interesting to note the total results as shown 

 in Table II. 



Mr. J. J. Davis : In connection with the attractiveness of soap to 

 grasshoppers, it may be of interest to state that Mr. Leach, who has 

 been working with insecticides for the control of the Japanese beetle, 

 has found that soap added to arsenate seemingly has an attraction for 

 that insect. 



President Wilmon Newell: The next paper is by T. J. Headlee. 



