140 



JOrRNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 14 



Table I. — Showing the Number ot Grasshoppers Feeding Daily at Variously Flavored 



Poisoned Baits 



Attractive Element 



Amyl acetate 



Vanilla 



Watermelon 



Molasses and salt only 



Salt only 



Oranges 



Apples 



Cantaloupe 



Vinegar 



Bananas 



Lemons 



Lemon extract 



August 4 



_ Number 



Rank Feeding 



10 

 3 

 7 

 4 

 6 

 5 

 11 

 12 



49 

 10 

 33 



8 

 7 

 IS 

 11 

 18 

 13 

 18 



August 6 



_ , Number 

 Rank Feeding 



11 

 9 

 10 



7 

 12 



166 

 127 

 96 

 78 

 76 

 75 

 72 

 50 

 61 

 55 

 75 

 42 



August 7 



Rank 



Number 

 Feeding 



164 

 105 

 47 

 69 

 74 

 59 

 69 

 78 

 79 

 57 

 44 

 63 



Total 

 Number 

 Feeding 



379 

 242 

 174 

 157 

 157 

 152 

 152 

 146 

 143 

 135 

 126 

 HI 



Final 

 Rank 



Conclusions 



1. Amyl acetate was decidedly the best of all the attractive materials 

 used, ranking first in every test and attracting far more grasshoppers 

 than any other bait. The use of amyl acetate in grasshopper baits 

 was first suggested by Professor R. A. Cooley in 191S and was tried in 

 one experiment v/ith promising results during that season. Our results 

 with it in tests conducted this year lead us to believe that it is a most 

 promising substitute for citnis fruits in the standard poison bran mash 

 bait for grasshoppers. Amyl acetate is not only the most attractive 

 of the materials tried out but is also the cheapest of those that ranked high 

 in attractiveness. An ounce costs five cents and is equal to eight 

 lemons or oranges. It also has the additional advantage of being ready 

 to add to the poison bran mash without cutting or grinding, it is so 

 concentrated that it is easy to transport, and it will keep indefinitely. 



2. Vanilla ranked second in the list of attractive materials and with 

 amyl acetate was far better than any of the other materials tried. Its 

 present cost is such that it cannot be used economically in grasshopper 

 baits. 



3. Of the fresh fruits used, waLcrmelon gave the best results but it was 

 no where near as attractive as amyl acetate or vanilla and was little 

 better than salt alone. 



4. One of the surprising results of the experiments was that salt 

 alone gave just as good results as when molasses and salt were used and 

 that both gave better results than wlien lemons or oranges were added. 

 This is of considerable interest because it indicates that excellent 

 results may be obtained even when it is impossible to secure molasses 

 or citrus fruits, as sometimes happens. If this point can be established 

 by further experiments, it means that thousands of dollars have been 

 wasted in the useless purchase of molasses and citrus fruits. It will 

 also mean that in the future farmers will more readily use grasshopper 

 baits because of decreased cost and labor in the preparation. It should 



