April, ’24] 
CORKINS: GRASSHOPPER BAITS 
311 
Mr. E. P. Felt : I would like to ask if any. attempt has been made to 
eradicate this new species. 
Mr. W. E. Britton: We have carried on a few experiments in small 
areas to determine the best method of killing the grubs. The work is 
difficult, however, because there are many small yards that children are 
playing in and it is dangerous to use cyanide or similar poisons. The 
matter has been reported to the Federal Horticultural Board but no 
decision has been reached as to whether an attempt should be made to 
exterminate this insect. 
President A. G. Ruggles: The next paper will be read by C. L. 
Corkins. 
GRASSHOPPER BAITS, WITH SPECIAL REFERENCE 
TO SODIUM ARSENITE 
By C. L. Corkins, State Entomologist University of Wyoming 
Abstract 
Experimental work with grasshopper baits was carried on over a period of three 
years with a two-fold purpose in view, first, to determine the merits, under Colorado 
conditions, of the ingredients commonly used in standard grasshopper baits; and 
second, to find a more practical killing agent than white arsenic. 
Amyl acetate and salt are essential elements of an efficient grasshopper bait. A 
combination of bran, arsenic and water only, gave surprisingly good results, but not 
good enough for practical usage. The value of expensive molasses is doubtful. 
Only when cheap sugar beet refuse molasses can be obtained does it seem justifiable- 
to include it. The substitution of 50% by bulk of sawdust in place of bran in baits to- 
be used on lands of low productive value per acre , is recommended. Fermentation of 
the bait to replace the use of amyl acetate gave poor results when used for our eco¬ 
nomic species of Acrididae but excellent results in the case of Anavrus simplex. 
The superiority of sodium arsenite over white arsenic was established by two years 
of experimentation and its extensive use in two large epidemics of grasshoppers. 
As a killing agent, it is fully as efficient as the best mixed white arsenic and is more 
practical in mixing, cost and handling. 
(Withdrawn for publication elsewhere). 
President A. G. Ruggles: We will now hear the next paper by 
R. C. Smith. 
