10 BULLETIN" 245, U. S. DEPARTMENT OF AGRICULTURE. 



Table V. — Destruction of fly larvae in horse manure. Results with aniline, hellebore, 

 nitrobenzene, and pyridine; open-pile experiments, New Orleans, La., 1914- 



Series. 



49 



52 



Treatment: 5 gallons liquid added to 4 bushels of manure; 

 4 applications. 



Pyridine, 1-500. 

 do 



Aniline, 1-400.. 

 do. 



Control 



Nitrobenzene, 1 pound and J pound fish-oil soap to 10 gal- 

 lons water 



.do. 



Nitrobenzene, J pound and J pound fish-oil soap to 10 gal- 

 lons water. . .". 



do 



Control 



Hellebore, ground, \ pound to 10 gallons water. 

 do 



Hellebore, ground, \ pound to 10 gallons water. 



do 



Control 



Aniline, 1-500 



do 



Hellebore, powderea, \ pound to 10 gallons water. 



do : 



Control (water only) 



Hellebore, powdered, A pound to 10 gallons water. 

 do 



.do. 

 .do. 



Control (water only) 



Hellebore, powdered, \ pound to 10 gallons water. 

 .do. 



Hellebore, powdered, \ pound to 10 gallons water 



do 



Control (water only) 



Nitrobenzene, J pound and 1 pound fish-oil soap to 10 gal- 

 lons water 



.do. 



Pyretheum, powdered, \ pound to 10 gallons water. 



do 



Hellebore, powdered, f pound to 10 gallons water... 



do 



Borax, powdered, 1 pound to 10 gallons water 



do 



Control (water only) 



Pupae 

 found. 



Number. 



4,756 



1,948 



70,642 



56, 651 



342, 771 



96,053 

 92, 771 



74,636 



92,954 



385, 403 



564 



772 



13,265 



17,526 



273,520 



1,707 



1,603 



502 



162 



7,202 



398 



293 



449 



334 



8,866 



7 



14 



12, 294 



24,233 



43, 733 



3,036 



3,415 



24, 346 



31,379 



7,694 



5,725 



1,390 



953 



29,831 



Emergence 

 from sam- 

 ple of 200 

 pupae. 



67.0 

 74.0 

 52.0 

 43.0 



49 



49 



40.5 



40.5 



93 



23.8 



23.8 



71.0 



71.0 



95 



63 



63 



95.5 



95.5 



95 



95 

 8.5 

 8.5 



98.5 



Apparent 



larvicidal 



effect. 



Per cent 

 of control. 

 98.6 

 99+ 

 79.4 

 83.5 



75.0 

 76.0 



80.6 

 76.0 



99+ 

 99+ 

 95 

 93.7 



84.2 

 83.6 

 96.4 

 99.0 



97.8 

 98.4 

 98.0 

 98.5 



99+ 

 99+ 

 80.0 

 60.0 



93.4 

 92.8 











75.5 

 81.8 

 99+ 

 99+ 



As only one duplicate set of open piles treated with aniline 1 to 

 200 was examined, the data are not sufficient on which to base any 

 conclusion as to its effect on the bacteriological and chemical compo- 

 sition of the manure. Aniline in all open-pile experiments showed 

 a high larvicidal efficiency even in the dilution of 1 to 500, but it 

 should be handled with care because of its possible toxic effects. 



BETA NAPHTHOL. 



Beta naphthol was tried in three cage experiments, using solutions 

 containing 0.1 pound, 0.33 pound, and 1 pound, respectively. Where 

 the 1 -pound application was made only 11 per cent of the maggots 

 were killed, and in the other two cases the results were negative. No 

 bacteriological or chemical examinations were made of the treated 



manure, 



