Resolution of persistence in soil applied pesticides containing drins and studies on the uptake and penetration of them in crops
2008
Hashimoto, Y.(Tokyo-to. Agriculture and Forestry Research Center, Ome (Japan))
Pesticide use is necessary for satisfactory agricultural production. However, pesticide residue is a very serious problem. In particular, agriculture in the major city of Tokyo is conducted in small fields near residential areas, and in such a situation, exposure to pesticides outside agricultural areas may be a daily occurrence. In this agricultural environment, the use of soil applied pesticides will help to avoid this problem. The aim of this study is to provide an in-depth look at the behavior of soil applied pesticides regarding certain registered pesticides. In addition, the residual concentration of lapsed drins was investigated regarding current soil and crops. The results indicated the provisions required to avoid uptake into cucumbers from soil, and proposed various methods. The change in residual concentrations in soil was investigated after treatment with fluazinam, flusulfamide, acetamiprid and benfuracarb for cabbage cultivation. High levels of fluazinam and flusulfamide remained in soil. On the other hand, the levels of acetamiprid and benfuracarb remaining in soil were low. Acetamiprid and benfuracarb, penetrating pesticides, were absorbed into cabbages within 1-2 weeks of application, although the residual concentration in cabbages at harvest was less the detection limits. The change in the residual concentration of pesticides in soil of fields and in cucumbers which were treated with fosthiazate was investigated. The half-value period of fosthiazate was 4.5 days and the concentration was 0.5-1 micro g/g.
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