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THE SYSTEMIC PROPERTIES OF DIETHYL‐S‐z‐ (ETHYLTHIOETHYL) PHOSPHOROTHIOLATE (DEMETON‐S) WITH REFERENCE TO THE CONTAMINATION OF NECTAR
Author(s) -
Thomas W. D. E.,
JONES G. D. GLYNNE
Publication year - 1955
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1955.tb02467.x
Subject(s) - officinalis , biology , brassica , nectar , contamination , botany , pollen , ecology
The fate of diethyl 5‐2‐(ethylthioethyl) phosphorothiolate (demeton‐S) in white mustard (Brassica alba) , borage (Borago officinalis) and field beans (Viciafaba) has been followed over several weeks using the radioactive tracer technique. Radio‐assay of nectar samples from flowers which opened a few days after spraying showed that no unchanged demeton‐S, but that small amounts of degradation products were present. The highest value for total radioactivity found in the nectar corresponded to 2–7 p.p.m. expressed as demeton‐S. Radioassay of treated leaves and new growth after spraying confirmed that demeton‐S is rapidly con, erted in the plant into two primary degradation products extractable by chloroform. Further breakdotvn is more rapid in new growth and appreciable quantities of the two primary products believed to be biologically active are retained by the treated leaves.