BULLETIN 408^ U. S. DEPARTMENT OP AGRICULTUEE. 



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

 and solutions of calcium cyanamid — Continued. 



No. 



Material iised. 



Treatment of 4 bushels of manure 

 with following amoixats of mix- 

 tures, then sprinkled with 5 gal- 

 lons of water. 



Flies 

 emerged 

 (num- 

 ber). 



Apparent 

 larvicidal 



eflect 

 (per cent 

 of control 

 average). 



Flies emerged 

 from control cages. 



Num- 

 ber. 



Average. 





Calcium cyanamid + 

 acid phosphate. 



do 



A, f poimd calcium cyanamid + 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, IJ pounds calcium cyanamid + 2^ 

 pounds acid phosphate. 



B, 1§ pounds calcium cyanamid 4- 2J 

 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, 2J gallons to 2 bushels ma- 

 nure. 



2,377 



975 



1,025 



1,263 



62 



61 



598 



327 



677 



312 



263 



11 





 38 

 35 

 20 

 62 

 62 

 34 



64 



25.2 



65.5 



17 



96.5 







13 







14 



1,247 



1,901 



263 



62 



[ 1,574 



^Tl 



do 



i 163 





Calcium cyanamid 

 in solution. 



do 











16 

 17 



1,173 



635 

 552 



81 



i 904 



[ 314 

 J 









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 op Potash (KCl), 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). 



