Where red clover was sprayed with 1 to 6 lb. of toxaphene per acre and 

 harvested 69 days after treatment, only the 2-lb. plot carried measurable 

 residues (0.29 p. p.m.). The presence of only one sample with measurable resi- 

 due may possibly be explained by an overtreatment of one or more portions of 

 the 2-lb. plot which could result in a higher residue sample. 



Lima Bean Sti^w 



The feeding of lima bean straw is not as widespread as the feeding of 

 either red clover or range grass. The residue values obtained on lima bean 

 straw treated with azinphosmethyl, dimethoate, disulfoton, phorate, and 

 trichlorfon are presented in table 3, 



Table 3. -Insecticide residues on lima bean straw 



Formulation 

 and method 

 of application 



Number 



of 



treatments 



Pounds 

 per acre 

 (actual) 



Days since 

 last 

 application 



Residue in 

 parts per 

 million-^ 



Azinphosmethyl : 



Emulsion-foliage spray - 



Dimethoate : 



Emulsion-^f oliage spray - 

 Do. -------- 



Do. -------- 



Do. -------- 



Granules-soil - - - - 



Do. -------- 



Disulfoton : 

 Granules-soil 



Do. 



Do. 



Do. - - - - 



Phorate ; 



Granules-soil 

 Do. - 



Trichlorfon : 



Emulsion-foliage spray 



1.5 





.5 



1 



.0 





.5 



1 



.0 





.36 





.44 





.66 



1 



.00 





.5 



1 



.3 



2.0 



44 



37 

 51 

 37 



51 

 139 

 do. 



139 

 132 

 132 

 139 



139 



do. 



44 



7.8-20.3 



<^.10 



< .10 



< .10-. 12 



< 



10 



< .10 



< .10 



< .12 



< .12-. 56 



< .12-. 61 



< .12-. 58 



< .30 



C .30 



02-. 07 



1/ Corrected for appropriate control samples, but not corrected for 

 average percentage of recovery. 



2/ This symbol indicates less than the lower limit of accuracy of the 

 analytical method as used. 



- 10 - 



