BIOEFFICACY AND RESIDUE DYNAMICS OF SOME PESTICIDES USED AGAINST INSECT PESTS OF BRINJAL AND CHILLI
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Date
2023-08-04
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UHF,NAUNI
Abstract
ABSTRACT
The present investigation on “Bioefficacy and residue dynamics of some pesticides used against
insect pests of brinjal and chilli” was carried out during 2021 and 2022 in the department of Entomology, Dr.
YS Parmar University of Horticulture and Forestry, Nauni, Solan. Bioefficacy studies revealed that fenazaquin
@ 250 g a.i./ha (81.98% and 82.80%) was most effective in reducing jassids population, whereas,
chlorantraniliprole @ 80 g a.i./ha was effective against shoot and fruit borer in reducing shoot infestation
(2.22% and 2.45%) and fruit infestation (6.78% and 6.13%) on brinjal crop. In case of thrips in chilli,
cyantraniliprole @ 120 g a.i./ha (83.06% and 85.27%) proved to be most effective during 2021 and 2022,
respectively. No phytotoxicity symptoms were observed on the brinjal and chilli plants after application of
pesticides at given doses. Population of coccinellids after imposing the treatments declined to some extent in a
decreasing order viz., chlorantraniliprole > fenvalerate > spiromesifen > fenazaquin > chlorpyriphos in brinjal
and flubendiamide > cyantraniliprole > spirotetramat > fenazaquin > imidacloprid in case of chilli. The highest
benefit cost ratio of 4.22:1 and 4.29:1 was recorded in the plots treated with chlorantraniliprole @ 40 g a.i./ha in
brinjal and 2.98:1 and 3.11:1 in the plots treated with cyantraniliprole @ 60 g a.i./ha in chilli during 2021 and
2022, respectively. Dissipation studies in brinjal and chilli showed that all the pesticides followed first order
kinetics. The average initial deposits of spiromesifen (@ 96 and 192 g a.i./ha), fenazaquin (@ 125 and 250 g
a.i./ha), chlorantraniliprole (@ 40 and 80 g a.i./ha),, fenvalerate (@ 75 and 150 g a.i./ha) and chlorpyriphos (@
200 and 400 g a.i./ha) on brinjal fruits were 0.672 and 1.133 mg/kg, 0.457 and 0.761mg/kg, 0.867 and 1.433
mg/kg, 0.587 and 1.233 mg/kg and 0.918 and 1.825 mg/kg at single and double dose, respectively. On chilli, the
average initial deposits of cyantraniliprole (@ 60 and 120 g a.i./ha), imidacloprid (@ 25 and 50 g a.i./ha),
spirotetramat (@ 60 and 120 g a.i./ha), flubendiamide (@ 50 and 100 g a.i./ha) and fenazaquin (@ 125 and 250
g a.i./ha) reduced to half in a range of 1.46 – 3.10 days and 1.64 – 3.47 days at single and double dose,
respectively. In brinjal field soil and in red chilli and chilli field soil the residues detected were below limit of
quantification at harvest at both X and 2X doses for all the tested pesticides. Risk assessment of all the
pesticides calculated as hazard quotient was less than 1 and as theoretical maximum daily intake was less than
maximum permissible intake, thus all the tested pesticides on both the crops considered to be safe, provided
proper waiting period of 2-3 days in brinjal and 5-11 days in chilli should be followed