D. Bull
Dec 16, 1968
Citations
1
Influential Citations
25
Citations
Journal
Journal of Economic Entomology
Abstract
Metabolism of S35-labeled UC-21149 (2-methyl-2-(methylthio) propionaldehyde O -(methylcarbamoyl)oxime) in cotton plants and its fate in soil under normal field conditions was investigated. After 2 days the compound was completely metabolized in individually treated leaves, primarily to the toxic sulfoxide derivative 2-methyl-2-(methylsulfinyl) propionaldehyde O -(methylcarbamoyl) oxime. Once formed, the sulfoxide was relatively stable; the biological half-life was about 1 week and 14% of the applied dose was still in this form after 32 days. Studies of translocation demonstrated that there was little movement of radioactivity from treated leaves to untreated areas of the cotton plants. UC-21149 and at least 10 of its derivatives were detected in treated soil. Of these, the sulfoxide was usually the dominant product; UC-21149 was essentially depleted after 1 week. After 8 weeks, 86.3% of the applied radioactivity was lost from the treated soil, either by volatilization or by movement as a result of moisture from rainfall and irrigation.