BULLETIN 408, U. S. DEPARTMENT OF AGRICULTURE. 



lion of fly larvx in horse manure — Results wiii 

 and solutions of calcium cyanamid — Continued. 



Table 4. — Destruction of fly larvx in horse manure — Results with fertilizer mixtures 

 )lut' 



No. 



Material used. 



Treatment of 4 bushels of manure 

 with following amounts of mix- 

 tures, then sprinkled with 5 gal- 

 lons of water. 



Flies 

 emerged 

 (num- 

 ber). 



Apparent I Flies emerged 

 larvicidal from control cages. 



effect I 



(per cent 



of control 

 average). 



Num- 

 ber. 



Calcium cyanamid + 

 acid phosphate. 



.do. 



.do. 



Calcium cyanamid 

 in solution. 



.do. 



A, f pound calcium cyanamid 4- 4 

 pounds acid phosphate. 



B, f pound calcium cyanamid + 4 

 pounds acid phosphate. 



A, 1 pound calcium cyanamid + 6 

 pounds acid phosphate. 



B, 1 pound calcium cyanamid + 6 

 pounds acid phosphate. 



A, 1| pounds calcium cyanamid + 2\ 

 pounds acid phosphate. 



B, \\ pounds calcium cyanamid + 2 J 

 pounds acid phosphate. 



A, 4 per cent solution of calcium cy- 

 anamid, 5 gallons to 4 bushels ma- 

 nure. 



B, 4 per cent solution of calcium cy- 

 anamid, 5 gallons to 4 bushels ma- 

 nure. 



C, 3 per cent solution of calcium cy- 

 anamid, 5 gallons to 4 bushels ma- 

 nure. 



D, 3 per cent solution of calcium cy- 

 anamid, 5 gallons to 4 bushels ma- 

 nure. 



A, 4 per cent solution of calcium cy- 

 anamid, 2 J gallons to 2 bushels ma- 

 nure. 



B, 4 per cent solution of calcium cy- 

 anamid, 2\ gallons to 2 bushels ma- 

 nure. 



2,377 



975 



1,025 



1,263 



62 



61 



598 



327 



677 



312 



35 

 20 

 62 

 62 

 34 



64 



25.2 



65.5 



17 



1,574 



1,901 





263 

 62 



[ 163 



1,173 







904 



635 





552 



| 





\ 314 



81 





When calcium cyanamid was present in mixtures at the rate of 

 one-half pound per bushel of manure, it is apparent from the results 

 given in Table 6, No. 4, that a satisfactory larvicidal action was 

 obtained. It is evident that practically four times as much cyanamid 

 is required in mixtures for the effective treatment of open piles as 

 for cages or boxes. 



Calcium Cyanamid, Muriate of Potash (KC1), and Acid Phosphate. 



This mixture, though similar to the one just discussed, showed no 

 apparent larvicidal action in the amounts employed (Table 4, No. 4). 



