12 Department Circular 367, U. S. Dept. of Agriculture 



Table 3. — Airplane dusting 1 on rice field for destruction of Anopheles larvm, 



Mound, La., 192k 



Station No. 



Part of 

 field 



Number of 

 larvae in 

 10 dips 



Number of 



Paris green 



granules 



per square 



inch 



Reduction 

 following 

 dusting 



1 . . ... 



East 



...do 



9 

 30 

 36 

 22 

 26 

 8 

 4 

 8 

 16 

 10 

 15 

 18 

 8 

 32 

 18 

 11 

 25 

 7 



347 

 236 

 84 

 42 

 74 

 48 

 66 

 54 

 68 

 86 

 8 

 2 

 2 

 45 

 48 

 73 

 20 

 2 



Per cent 

 100 



2 - 



100 



3 _ . 



...do 



72 



4 - . 



...do 



73 



5 



...do 



77 



6 --- 



...do 



25 



7 . .. . . 



...do 



50 



8 



...do 







11 ... . 



Center 



...do 



100 



12 -. - - 



90 



13 ... 1 



...do 



80 



14 _ . . . - - - --- 



-_.do .... 



44 



15 . - -._ .. - - --- 



...do 



12 



16 . ... .._ _ ._ . .. _ - - 



West 



...do 



100 



17 . . . _ --- 



100 



18 



.do 



...do 



.. do 



82 



19 



20 _......__. 



80 

 





Average. 







16.8 



72 



73.0 

 78 5 





99.0 













i Five pounds of Paris green and 100 pounds of dust were used. 

 Table 4. — Lake dusting for destruction of Anopheles larvm; Mound, La., 1924 



EX VIA LAKE 

 Dosage: 20 pounds of Paris green to 140 pounds of Tripoli earth 



Station No. 



Number of 

 larvae in 

 10 dips 



Number of 



Paris green 



granules 



per square 



inch 



Reduction 



from 



dusting 



Killed in 

 pans con- 

 taining 10 

 larvae each 



i 



80 

 36 

 44 

 24 

 10 

 16 

 43 

 45 

 8 

 4 

 20 

 46 

 14 

 14 



6 



151 



22 



38 



232 



139 



82 



276 



193 



146 



214 



150 



124 



245 



Per cent 

 55 

 94 

 93 

 100 

 100 

 100 

 96 

 100 

 100 

 100 

 100 

 100 

 71 

 86 



Per cent 

 50 



2 



100 



3 



80 



4 



100 



5, 6 



100 



7 



100 



8, 9, 10 



0) 



100 



11 



12 



100 



13 



0) 



100 



14 



15 



0) 

 0) 

 0) 



16 



17 





Average ..... ...... . ... ... 



28.9 



144 



88.0 



91.8 







'No 



Dosage: 



BLUE FRONT LAKE 

 pounds of Paris green to 120 pounds of Tripoli earth 



1 



20 

 18 

 17 

 16 

 24 

 14 

 13 

 25 

 14 

 17 

 15 



390 

 662 

 838 

 810 

 420 

 499 

 524 

 172 

 419 

 33 

 43 



100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 91 

 100 



100 



2 



100 



3 



100 



4 



100 



5 



100 



6 



100 



7 



100 



8 



100 



9 



100 



10 



100 



11 . .. 



100 







Average .... .. 



17.5 



437 



99.1 



100 







