Abstract
Pesticide residues in water were monitored 19 times in five creaks in Saga during April to December in 1978. Herbicide benthiocarb and simetryne were found during June to August, showing the highest concentration of 19.5 ppb in early July for benthiocarb and 10.2 ppb in mid-July for simetryne. Herbicide molinate was found during July to August, showing the highest concentration of 62.9 ppb in mid-July. Insecticide cartap was detected with less frequencies and its concentration was lower than 0.2 ppb. Residue levels corresponded to the application time and dosages of the pesticides applied in paddy fields.
