196 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 12 



also because in one of the three experiments in which it was used it was 

 placed in a slight depression which undoubtedly gave an unfair result. 



A single earlier experiment on August 22, using ten baits under simi- 

 lar conditions but in another part of the same field gave the following 

 results: apple, molasses and salt, 14 hoppers and 6 crickets; apple and 

 molasses, 13 hoppers; molasses alone, 8 hoppers and 4 crickets; apple 

 alone, 7 hoppers and 1 cricket; lemon extract alone, 7 hoppers and 1 

 cricket; lemon fruit and molasses, 6 hoppers and 1 cricket; banana 

 alone, 6 hoppers; molasses, lemon extract and salt, 6 hoppers; salt alone, 

 3 hoppers; lemon extract and salt, 2 hoppers. 



The above observations are summarized in the following table : 



Summary of Results of Attractiveness Experiments 



These experiments indicated that apples and bananas when used alone 

 or with molasses are as attractive or slightly more so than lemon fruit 

 or lemon extract. 



Actual control experiments testing these various combinations all 

 gave satisfactory results with mortalities varying from 60 to 98 per 

 cent. In a series of baits sown on August 20, one containing apples 

 and molasses gave, at the end of five days, an average count of 40 dead 

 hoppers to the square yard, or approximately 75 per cent. A bait 

 containing lemon fruit and molasses, but sown in an area containing a 



