7S 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 7 



Experimental Work on Attractiveness 



Mixtures 



OF Various Poison 



Experiments to determine the attractiveness and effectiveness of 

 a number of poison baits were made. The sites chosen for such ex- 

 periments were bare of vegetation but rich in green vegetation 

 twenty-five to one hundred feet away. 



For example beds of dried up ponds and unused bare irrigation 

 ditches were used. In such situations the grasshopper could readily 

 be observed descending from the food plants and marching directly 

 to the poison. 



The general mixture of bran, Paris green, and syrup was used, lemon, 

 anise oil, stale beer, and vinegar were added to separate portions 

 respectively. On further experiment, plain bran and Paris green and 

 plain bran with syrup were used to check results 



The object of these experiments was to find, if possible, a cheaper 

 product to take the place of the expensive lemon, using vinegar, 

 if possible. 



Beginning with the lemon mixture and following it by anise oil, 

 stale beer, and vinegar mixtures respectively, these were put out sep- 

 arately in a series of portions, about a teaspoonful in a place. Counts 

 were then made of the number of hoppers attracted to the various 

 baits and recorded as follows: 



Experiment 1 



Showing number of hoppers attracted to individual baits 



These counts were made at intervals of twenty to thirty minutes. 



Count No. 



Pile No. 1 

 Pile No. 2 

 Pile No. 3 

 Pile No. 4 

 Pile No. 5 

 Pile No. 6 

 Pile No. 7 

 Pile No. 8 

 Pile No. 9 

 Pile No. 10 

 Pile No. 11 



Lemon 



Anise Oil 



Stale Beer 



3 1 



2 3 



Vinegar 



11 



15 

 14 

 6 

 9 

 4 

 4 

 6 

 8 

 11 

 3 

 6 





 

 

 

 

 1 

 

 1 

 1 

 

 10 



73 



28 



36 45 17 



35 30 i 5 



26 



39 



13 



Total number of hoppers attracted by various baits : 



Lemon, 187 Stale beer, 70 



Anise oil, 98 Vincp;ar, 78 



The third count shows the comparatively small number of hoppers attracted 

 after the bait had dried out. 



