Field experiments were carried out to study the residual behavior of foliar application of bensultap and imidacloprid in broad bean plants and their runoff persistence in soil under plants. The residues amount decreased to be 0.29 mg/kg after 22 days of treatment with 97.7 % loss in the leaves of broad bean after bensultap application. While residues disappeared in leaves after 22days of imidacoprid application.
The half-life time (t_1/2) values for bensultap in green pods of faba bean was calculated to be 2.9 days for peels. Whereas ,in the case of imidacloprid, the RL₅₀ value was 0.93 days in faba bean green peels but, residues could not be detected in green seeds one hour after treatment Data concluded that. the green pods can be safely harvested for human consumption after the third day of application based on the PHI value obtained.  In soil the RL₅₀ of  bensultap  was 4 days, while the persistence of the runoff of imidacoprid  on the soil under the plants was a little longer than that in bensultap which was 5 days.