PERSISTENCE OF DIAZINON ON CONCORD GRAPES 
Reported by E, F. Taschenberg and A, W, Avens, 
New York State Experiment Stations 
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Figure 4,--Persistence of Diazinon on grapes, 
parts of plants grown in soil treated with heptachlor. Studies are underway to obtain 
more data concerning this very important problem, 
The foregoing examples point out the necessity for developing analytical methods 
that are capable of detecting minute quantities ofinsecticides and the various metabolites 
or degradation compounds that may occur. Colorimetric procedures, radioactive tracers, 
paper chromatography, infrared spectroscopy, and gas chromatography are some of the 
approaches used by chemists. There is probably no field of insecticide research that 
offers a greater opportunity for valuable contributions. 
Our situation regarding knowledge of the occurrence and the fate of insecticide 
residues, then, is briefly this. We have accumulated a wealth of new data during the past 
decade, and have increased our understanding of the degradation of residues manyfold. 
This is particularly noteworthy in view of the limited support that has been given such 
research, Despite this progress, we are still much too weak in our understanding of 
the metabolism and degradation of these residues. We are little more than holding our 
own as more compounds come into use, Intensified programs of study to find the route of 
degradation or metabolism of insecticides, including many of those with long-established 
uses, is essential if we wish to keep our research on a scientifically sound basis. 
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