- 7 - 



Table U* — Percent kill of adult pea aphids 2 days after being sprayed 

 with various concentrations of N-substituted f ormamides in acetone 

 solution 



Formamide 5 percent 



1 percent 



0«5 percent 



Formamide, N,N-dioctyl- 



100 



92 



61 



N, N-dipentyl- 



100 



8U 





N-octyl- 



100 



63 





N,N-dibenzyl- 



100 



32 





N-phenethyl- 



100 



3U 





Formanilide, N-pentyl- 



100 



6 





N-isopentyl- 



100 









Formamide, N-hexyl- 



88 







N-heptyl- 



83 







N,N-dibutyl- 



78 







N-butyl- 



67 







Formanilide, N-butyl- 



58 







p-chloro- 



57 







Formamide, N-2-hydro3yethyl- 



Sh 







Formanilide, N-ethyl- 



52 







m-chloro- 



52 







Formamide, N-tert-butyl- 



52 







N- ( 1-ine thylbutyl ) - 



51 







N- ( 1-methylpentyl ) - 



51 







N , N-dicyclohexyl- 



38 







N-isobutyl- 



37 







N,N-dipropyl- 



32 







N,N-diethyl- 



25 







N-propyl- 



2U 







N- ( 3 -methoxypr opyl ) - 



21 







N-sec-butyl- 



17 







p_-Formanisidide 



15 







Formamide, N,N-diisopropyl- 



11 







N-ethyl 











Formanilide, o-chloro- 











2,5-dichloro- 











p_-Formophenetitide 











Parathion (0.025 percent) 



91 







