16 



BULLETIN 377, U. S. DEPARTMENT OF AGEICULTURE. 



Audubon Park, New Orleans, vv^ith the Nickels sirup in the strength 

 as recommended originally, and also double, half, and quarter 

 strengths. One gill of sirup was used to a jar, each jar being 

 placed on its side to give free access to the ants, to prevent the 

 entrance of water, and to prevent mold. The "Hall" furnished 

 ideal conditions for the experiment, the temperature throughout the 

 year being kept high and uniform. The abundance of various 

 species of scale insects and aphids attracted the ants in great num- 

 bers at all seasons, but especially in cold and wet weather. Three 

 jars of each strength were used and observations wepe made fre- 

 quently for a period of 32 days. At the time of this experiment 

 the ants were very numerous, due to the extremely wet summer of 

 1912. The rate of attendance and relative repellent value of the 

 four strengths of the poison are shown graphically in the first part of 

 Table I. 



Table I. — Experiments icitli sodkirn arsenite (NaAsO^) added {in four strengilis^) 

 to sugar sirup solution, 1912. 



[Symbols: A= Heavily visited by ants. B=0nly attended by a few ants. C=Not attended by ants ] 

 FIRST TEST, IN HORTICULTURAL HALL. 



Date. 



Double strength. 



Nictels solution. 



Half strength. 



Quarter strength 





A 

 A 

 B 

 A 

 B 

 B 

 B 

 A 

 B 

 B 

 A 



c 



B 

 C 

 C 

 C 

 C 



A 



B 

 B 

 B 

 C 

 

 A 

 B 

 B 

 A 

 C 



c 



A 

 B 

 B 

 C 

 C 



A 



A 

 B 

 A 

 B 

 A 

 A 

 B 

 A 

 A 

 B 

 A 

 B 

 C 

 C 



c 



c 



A 

 B 

 B 

 A 

 B 

 A 

 A 

 A 

 A 

 

 B 

 C 



c 

 c 

 c 

 c 

 c 



A 



A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 C 

 A 

 A 

 A 

 C 



c 

 c 



A 



A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 C 

 B 

 C 

 C 

 A 

 A 

 A 



A 

 A 



A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 



A 

 A 

 A 

 A 

 A 

 A 

 B 

 A 

 A 

 . A 

 A 

 C 

 C 

 A 

 B 

 A 

 B 



A 

 A 

 A 

 A 

 B 

 A 

 A 

 A 

 A 

 A 

 C 

 A 

 A 

 C 

 A 

 C 

 A 



A 

 A 

 A 

 B 

 A 

 A 

 C 

 A 

 A 

 A 

 C 

 C 

 C 

 C 

 C 

 C 

 A 



A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 C 



A 





A 



June 12 



A 





A 





A 





A 





A 





A 





A 



June 22 P. 



June 26 



A 

 A 



June 28 



A 



Julyl 



A 



July 2 



B 



July 5 



A 



Julys 



A 



July 10 



A 







DUPLICATE EXPERIMENT, USING PAPER-BAG SIRUP CONTAINERS TACKED ON FIG 



TREES (OUTDOORS). 



July 26.... 

 July 28. . . . 

 July 29. . . . 

 July 30. . . . 

 July 31.... 

 August 1.. 

 August 2.. 

 Augusts.. 

 Augusts.. 

 August 12. 

 August 14. 

 August 16. 

 August 19. 

 August 21 . 

 .August 23. 

 August 26. 

 August 29. 

 August 31 . 



A 



A 



C 



A 



A 



B 



A 



A 



A 



A 



c 



B 



B 



C 



B 



B 



B 



A 



A 



B 



A 



A 



A 



A 



B 



B 



A 



A 



A 



A 



A 



A 



A 



A 



B 



C 



C 



A 



A 



A 



A 



B 



A 



A 



c 



B 



c 



B 



A 



B 



A 



A 



A 



A 



A 



c 



A 



(■; 



B 



B 



A 



A 



A 



A 



A 



A 



c 



C 



c 



C 



B 



A 



A 



A 



A 



A 



A 



B 



C 



c 



A 



A 



A 



A 



A 



A 



A 



A 



A 



A 



c 



A 



B 



B 



A 



B 



A 



A 



A 



A 



A 



c 



A 



A 



A 



A 



A 



A 



A 



B 



B 



B 



c 



A 



A 



A 



A 



A 



A 



A 



A 



B 



c 



A 



A 



A 



B 



A 



A 



A 



A 



A 



B 



B 



C 



A 



B 



B 



A 



A 



A 



A 



A 



c 



c 



B 



n 



A 



c 



A 



A 



B 



A 



A 



B 



c 



C 



A 



A 



B 



A 



B 



A 



A 



B 



A 



c 



B 



A 



A 



A 



A 



B 



A 



A 



A 



A 



B 



C 



A 



B 



C 



A 



A 



B 



A 



A 



A 



A 



c 



A 



B 



B 



A 



B 



A 



A 



A 



1 Double strength 



Nickels solution — 



Half strength 



Quarter strength. 



.10 pounds jiranulated sugar + .5 pounds II^O + 1 ounce NaAsOo. 



.10 pounds granulated sugar + 5 pounds H2O + J ounce NaAs02. 



.10 pounds granulated sugar + 5 pounds HoO -»- } ounce Na.VsOo. 



.10 pounds granulated sugar + 5 pounds H2O + | ounce NaAsOg. 



