Persistence of Fenamiphos in Soil Following Soil and Foliar Applications Under Tropical Conditions

Under field conditions the residues of fenamiphos persisted in soil up to 45 days with broadcast application of 5 and 10 kg a.i./ha and cowpea as crop. However, when applied in furrows at a lower dose of 1.5 kg a.i./ha and with okra as crop, the residues were detected up to 90 days. In colder season, the chemical could persist over 120 days when applied @ 2 kg a.i./ha and pea as crop. The half-life of fenamiphos varied between 5–18 days depending upon dose, method of application and cropping season. Also, following foliar spray, the residues persisted longer in colder than in warmer season.