NO. l8 SENSE ORGANS OF COLEOPTERA McTNDOO 25 



wheat bran, i pound of Paris green, i quart of sirup, and the juice 

 of 3 lemons or i teaspoonful of anise oil successfully against a wing- 

 less May beetle. 



McKinney and Milam (48) and Gilmore and Milam (19) have 

 successfully used a poisoned-bran bait against the grubs of the green 

 June beetle in tobacco-plant beds and in a tobacco field. 



A large white grub of a dynastid beetle is the most serious pest of 

 sugarcane in St. Croix. The control recommended in 191 6 by Smith 

 (80) was a poisoned bait. 



Poisoned-bran mash was the best control used by Cooley (10) in 

 191 7 against the spinach carrion beetle. 



Using a poisoned-bran bait in 1916 Scholl (71) destroyed the 

 striped blister beetle on alfalfa and tomatoes. 



Newman (59) in 1929 reports that a poisoned-bran bait gave ex- 

 cellent results against a subterranean clover weevil. 



Jack (32) in 1928 reports that over 95 per cent of certain weevils 

 in a maize held were killed by one application of a bait consisting 

 of I pound of sodium arsenite, 8 pounds of sugar, and 10 gallons of 

 water on chopped fodder. 



During the seasons of 1926, 1927, and 1928, over 1,000 traps, con- 

 taining fermenting sugar or molasses, were used in a peach orchard 

 in Pennsylvania for the purix)se of trapping oriental fruit moths. 

 Frost and Dietrich (16) report that incidentally 40 families of 

 beetles, including 188 genera and 258 species, were also caught in 

 these traps. 



Snapp and Swingle (81) have recently tested a large number of 

 aromatics, including various steam distillates and other odorous ma- 

 terials derived from the food of ])each insects. A large number of 

 chemicals were found, under orchard conditions, to be slightly at- 

 tractive to various jx^ach insects, as well as to the plum curculio, but 

 none showed much jiromise of being valuable from the standpoint of 

 control. 



Garman and Zappe (18) have also recently conducted many tests, 

 trying to find attractants and repellents for the plum curculio. They 

 remark that curculios are very sensitive to odors. Acetaldehyde and 

 malic acid were the only substances used in the laboratory which 

 showed much attractive power, but when these substances were tested 

 in the field no curculios were trapped. 



In conclusion under this heading a few remarks may be made about 

 the present writer's (45) results obtained when testing potato beetles 

 in an olfactometer. In this study no l)aits were actually used, but it 

 was proved for the first time that i)lants (not flowers) attract insects 



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