20 



BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 



Table 6. — Comparative results obtained by spraying 11 species of aphids with 

 alcoholic extracts derived form " cube," derris, and pyrethrum, etc. — Contd. 





Preparation. 



Percentage of aphids dead within 24 hours. 



d 



ED 



ft 



a 



m 



a 



3 

 o 



a 

 a . 



o o 

 o 



a 



•a 3 



ftO 



O c3 

 OO 

 03 w 



a 



a 



o ft 

 o 



3 



ft 



a 



ft 



3 



ft 

 <1 



A 



t-< 



ft 



m cj 



en's 



■rH O 



,d 

 <! 



— 



a.-; 

 o a 



ft° 



d 

 n 



a 



p. 







d 



W 



a 

 ft 



506 



Alcoholic extract+water 

 (l/2+100)+1.25 per cent 

 kerosene emulsion: 

 "Cube" 







90 

 80 

 50 



15 

 20 

 20 



















507 

























509 























509 



Alcoholic extract + soap+ 

 water (1+4+100): 













| 









507 



















506 



"Cube" 





























Table 7. — Comparative results obtained by spraying aphids with various ex- 

 tracts derived from "cube." 





Preparation. 



Insects tested. 



Percentage of aphids 

 within — ' 



dead 



Sample 

 No. 



Esti- 

 mated 



num- 

 ber of 



indi- 

 viduals. 



Num- 

 ber of 

 sets. 



Species. 



6 

 hours. 



1 

 day. 



2 

 days. 



3 



days. 



506 



Alcoholic extract + 

 soap+water: 

 2+2+100— 



Cold 



500 

 300 



300 



300 



2,500 



500 



500 

 3,000 



2,500 

 500 



500 

 2,500 



1,500 

 500 



800 

 600 

 300 

 500 



500 

 100 

 300 

 300 



500 



500 

 100 



500 



500 



500 

 100 



500 



1 



1 



1 

 1 

 5 

 1 



1 

 6 



5 

 1 



1 

 5 



3 

 1 



2 

 2 



1 

 1 



1 

 1 

 1 

 1 



1 



1 

 1 

 1 



1 



1 

 1 

 1 





60 

 50 



30 

 30 



100 



100 



100 

 98 



95 



100 



100 

 96 



97 

 95 



35 

 15 

 10 



90 

 60 



40 

 40 



95 

 65 



50 

 50 



95 



525 



Hot 



do 



75 



525 



1 + 2+100— 



Hot 



do 



60 



506 



Cold 



do 



60 



506 



Cold 



Macrosiphum sp. A. 

 do 





525 



Hot 







525 



1/2+2+100— 



Hot.' 



do 









506 



Cold 



do 



100 

 99 







506 



1/3+2+100— 



Cold 



do 



100 





525 



Hot 



do 





525 



1/4+2+100— 



Hot 



do... 









506 



Cold 



do 



99 



99 



100 



55 



15 

 10 



75 

 40 

 60 

 50 

 40 



5 



5 



10 



30 



5 



5 

 10 

 10 



100 

 100 





506 



1/6+2+100— 



Cold 



do 





525 



Hot 



do 





526 



Resin dissolved in al- 

 cohol+soap + 

 water: 

 2+2+100 





60 

 20 

 15 



65 



526 



1+2+100 





30 



526 



1/2+2+100 



do 



20 



526 



2+4+100 



Macrosiphum solan- 

 ifolii 







2+2+100 





526 



do 



30 

 60 

 40 

 40 



5 



5 

 10 

 20 



5 



5 

 10 

 10 



40 





526 



2+2+100 



Macrosiphum sp. C. 

 Aphis spiraecola. . .. 





526 



1+2+100 



60 

 50 



5 

 5 





526 



1/2+2+100 





527 



Filtrate from No. 506 

 +soap+water: 

 2+4+100 



Macrosiphum sola- 







2+2+100 





527 



. .do 





527 



2+2+100 



Macrosiphum sp. C 





527 



2+2+100 



30 



5 

 5 







35 



528 



Cold water extract + 

 soap+water: 

 2+4+100 



Macrosiphum solani- 

 folii 







2+2+100 





528 



do 





528 



2+2+100 



Macrosiphum sp. C. 





528 



2+2+100 



10 













1 Where a test did not continue for 3 days, columns are left blank. 



