Environmental fate and persistence behaviour of a combination product of deltamethrin and triazophos in and on brinjal under eastern Indian climatic condition

The present study is on the residue and persistence of Spark (1+35 EC) (Deltamethrin + triazophos) in Brinjal fruit after the application 1.25 lit/ha and 2.50 lit/ha along with untreated control. The study was carried out for consecutive three seasons. Dissipation and the corresponding parameters were calculated from the data obtained by analysis of the residual parent compounds. Spark was rapidly dissipated in brinjal following first order reaction kinetics at all rates of applications. The half lives of Deltamethrin were in range of 0.67 days to 1.14 days, and that of Triazophos were in range of 0.96 days to 1.72 days irrespective of the doses and seasons. The residue values were found to be below detectable limit on 10-15 day samples. The study revealed that spark will not pose any residual toxicity problem.