SWEP [Methyl N-[3,4-dichlorophenyl] carbamate] 
In green house studies SWEP was applied to rice, carrots, oats, wheat, 
corn, and barnyard grass. There were indications that trace amounts of SWEP 
were hydrolyzed in soil to 3,4~-dichloraniline. However, it was found that 
most of the herbicide was immobilized and bound as a lignin complex (274). 
(See also Karsil, Propanil, Dichloran, and Ramrod.) 
Hy 
Q 
Hw 7C-0-CH3 
Cl 
3,4-Dichloroaniline 

SWEP-Lignin Complex 
TCA [Trichloroacetate] 
=? aapered trichloroacetate was applied to corn and pea plants. 
TCA itself, but no metabolic products, was found (123). 
In soil, microorganisms degraded trichloroacetate after a lengthy 
period of adaptation. Dechlorination occurred with probable formation of 
oxalate (666, 731, 732). 
Breakdown of TCA by Pseudomonas dehalogenans and a Norcardia sp. was 
shown by evolution of chloride (665, 667, 668). 
294 
