- 6 - 



Table 3 •—Percent kill of fourth-instar nymphs of the large milkweed 

 bug 2 days after being sprayed with various concentrations of N- 

 substituted formaraides in acetone solution 



Formamide 5 percent 1 percent 0*5 percent 



Formamide, N-heptyl- 100 9$ 15 



N-octyl- 100 95 5 



N-tert-butyl- 95 100 10 



N,N-dibutyl- 100 90 35 



N-hexyl- 100 60 



N,N-dipentyl- 100 35 



N,N-dibenzyl- 100 10 



Formanilide, o-chloro- 100 5 



N-butyl- 100 



Formamide, N,N-diethyl- 100 



Formanilide, N-ethyl- 100 



Formamide, N-(l-methylpentyl)- 95 20 



N,N-dicyclohexyl- 9^> 10 



N,N-dioctyl- 90 15 



N-(l-methylbutyl)- 90 



Formanilide, N-pentyl- 85 



N-isopentyl- 80 



m-chloro- 80 



Formamide, N-phenethyl- 75 



Formanilide, g-chloro- UO 



Formophenetidide 10 



Formamide, N,N-dipropyl- 5 



Formanilide, 2,5-dichloro- 5 



Formamide, N-propyl- 



N-ethyl- 



N-butyl- 



N-isobutyl- 



N-sec -butyl- 



N,N-diisopropyl- 



£-Formanisidide 



Formamide, N-(3-methoxypropyl)- 



N-(2-hydroxyethyl)- 



Lindane (0,005 percent) 95 



