After exposure of adult larvae of Prodenia litura F. to pe labeled 
dipterix, the hemolymph contained 3 times more radioactivity than in the 
gut. While the concentration in the gut and hemolymph decreased with time, 
there was an accumulation of radioactivity in the fat. The metabolites 
excreted were identified as monomethyl- and dimethylphosphates, and the 
glucuronate of the demethylated dipterex. These metabolites were similar 
to those identified from in vivo metabolism of dipterex by Prodenia larvae 
(Zayed et al., 1965b). 
Diquat (1,1'-Ethylene-2,2'-dipyridenium dibromide) 
Paraquat (1,1'-Dimethyl-4,4'-dipyridenium di-methylsulfate) 
Studies with labeled material indicated that these compounds were not 
degraded by alligatorweed. Both compounds reacted as free radicals (Fun- 
derburk and Davis, 1964; Homer et al., 1960). 
After seven days exposure to ultraviolet light, 85% of the radioactivity 
of cl4 
-labeled diquat and paraquat was lost. Electrophoresis indicated 
three degradation products from paraquat and one or more from diquat (Coats 
et al., 1965). 
Studies on adsorption indicated that diquat is adsorbed to soil, 
kaolinite, and montmorillonite in amounts similar to paraquat. Only 
montmorillonite appeared to hold herbicides in an unavailable form to wheat 
at extremely high rates. When added to plastic poois, montmorillonite 
drastically reduced paraquat solution concentration within 24 hours (Coats 
et al., 1965). 
Redwetten of paraquat and diquat to colored free radicals was observed 
in fungal and bacterial cultures. In some cases, the organisms were colored; 
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