PERSISTENCE OF CARBENDAZIM, CYPERMETHRIN, ETHION AND PROFENOFOS ON CUCUMBER
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Date
2017-09
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UHF,NAUNI
Abstract
ABSTRACT
Dissipation of carbendazim, cypermethrin, ethion and profenofos in cucumber fruit and soil was
studied, following the application at recommended doses 250, 50, 500 and 500 g a.i. ha-1, respectively and
double dose 500, 100, 1000 and 1000 g a.i. ha-1, respectively, in the Department of Entomology, Dr. Y S
Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during the year 2016. The persistence
study on cucumber fruits recorded initial deposits due to single dose of carbendazim, cypermethrin, ethion
and profenofos as 1.235, 0.407, 0.817 and 0.960 mg kg-1, respectively. However, at double dose the
deposits were 2.388, 0.781, 1.586 and 1.861 mg kg-1, respectively. The initial deposits 0.132, 0.055, 0.102
and 0.106 mg kg-1 at single dose and 0.272, 0.124, 0.207 and 0.213 mg kg-1 at double dose were observed
for carbendazim, cypermethrin, ethion and profenofos, respectively, in cucumber cropped soil. The
residues of carbendazim, cypermethrin, ethion and profenofos reduced to half within 3 days for both single
as well as double dose. The waiting periods for the respective pesticides were worked out at their limit of
determination (0.05 mg kg-1 for carbendazim, cypermethrin, ethion and profenofos) due to lack of MRL
value by the FSSAI. In decontamination studies, tap water washing and luke warm water washing of
cucumber fruits were effective in removing residues to the tune of 29.07 and 37.37 per cent, respectively
on 1st day. However, peeling was found most effective (up to 100 per cent) in dislodging pesticide
residues. Hence, the study concluded that carbendazim and profenofos were the most persistent followed
by ethion and cypermethrin as least persistent among test pesticides on cucumber fruits. The safe waiting
period on cucumber was suggested as 10, 8, 8 and 11 days for carbendazim, cypermethrin, ethion and
profenofos, respectively. Peeling was found as the most effective decontamination process.
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