PLANTS INSECTICIDAL PROPERTIES. 



19 



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 



ft 



a 



03 



a 



o ei 



u w 

 o 



03 



a 



3 



.d 



ft© 



■- . 03 



o o 

 n u 



03 



a 



^3 



ftO 



II 



03 w 

 3 



a 



A . 



ftO 

 d ft 



o 



03 



< 

 3 



ft 



< 



3 

 < 



w 



ft 



3 

 p. 

 < 



6 



03 



H 



ft 



m d 



m'o 



•IH u 



xi 

 ft 

 < 



03 



fto 



O fl 

 U> o3 

 o w 

 o3 



d 



3 

 ft 



d 



CO 

 CO 



3 

 a 

 <1 





40 per cent nicotine sul- 

 phate: 

 1/400 + soap + water 

 (2.5+2+100) 



99 

 98 

 95 



100 

 92 



75 

 60 



90 



85 







99 

 99 













1/800 + soap + water 

 (1.25+2+100) 



1/1200 + soap + water 

 (0.8+2+100) 































1/400 + soap + water 

 (2.5+4+100) 





95 

 95 













100 









1/800 + soap + water 

 (1.25+4+100) 























Control, alcohol+soap+ 

 water: 

 4+2+100 



15 

 15 

 12 

 10 























2+2+100 



25 







5 







10 



20 











1+2+100 















1/2+2+100 























2+4+100 





5 



100 

 100 



98 



99 



99 

 100 



99 

 65 

 15 



99 

 98 



99 



95 



98 



75 

 98 

 99 





10 



10 













506 



Alcoholic extract+water 

 (1+100)+ 10 per cent 

 kerosene emulsion: 

 "Cube" 

















507 

























509 



Alcoholic extract+water 

 (2+100)+10 per cent 

 kerosene emulsion: 























509 



Alcoholic extract+water 

 (2+100)+5 per cent 

 kerosene emulsion: 























507 



Alcoholic extract+water 

 (1 + 100) +5 per cent 

 kerosene emulsion: 























506 



"Cube" 

























Control, alcohol+ water 

 (2+100)+: 

 10 per cent kerosene 

























5 per cent kerosene 

























2.5 per cent kerosene 























506 



Alcoholic extract+water 

 (l+100)+2.5 per cent 

 kerosene emulsion: 

 "Cube" 







98 

 100 







92 



88 







98 

 90 



98 



507 

















97 



509 



Alcoholic extract+water 

 (2+100)+2.5 per cent 

 kerosene emulsion: 

















509 



Alcoholic extract+water 

 (l+100)+2.5 per cent 

 kerosene emulsion: 







65 







70 







60 



95 



509 



Alcoholic extract+water 

 (2+100)+1.25 per cent 

 kerosene emulsion: 

















509 



Alcoholic extract+water 

 (1 + 100)+125 per cent 

 kerosene emulsion: 























507 

























506 



"Cube" | 





















