BIOEFFICACY AND RESIDUE DYNAMICS OF COMBINATION PRODUCT OF NOVALURON AND LAMBDA CYHALOTHRIN AGAINST INSECT PESTS OF TOMATO
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Date
2019-10
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UHF,NAUNI
Abstract
ABSTRACT
The present investigations on “Bioefficacy and residue dynamics of combination product of
novaluron and lambda cyhalothrin against insect pests of tomato” was carried out during 2018 in the
department of Entomology, Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan. The
objectives of the study were to evaluate the bioefficacy of combination product of novaluron and lambda
cyhalothrin (GPI 1316) against insect pests of tomato and their persistence on tomato fruits and soil. The
study comprised of treatments viz., novaluron + lambda cyhalothrin (9.45+1.9%) ZC @ 47+10 g a.i./ha,
novaluron + lambda cyhalothrin (9.45+1.9%) ZC @ 71+14 g a.i./ha, novaluron + lambda cyhalothrin
(9.45+1.9%) ZC @ 142+28 g a.i./ha, novaluron 10 EC @ 75 g a.i./ha, lambda cyhalothrin 4.9% CS @ 28 g
a.i./ha and chlorantraniliprole 18.5% SC @ 28 g a.i./ha. Bioefficacy results revealed that novaluron +
lambda cyhalothrin @ 142+28 g a.i./ha, was most effective against both, fruit borer (Helicoverpa
armigera) (83.82-92.42 %) and pin worm (Tuta absoluta) (76.31-91.31%) showing highest percent larval
reduction followed by novaluron + lambda cyhalothrin @ 71+14 g a.i./ha and novaluron + lambda
cyhalothrin @ 47+10 g a.i./ha. Minimum fruit damage of fruit borer (3.61%) and pin worm (2.33%) was
observed with novaluron + lambda cyhalothrin @ 142+28 g a.i./ha, followed by novaluron + lambda
cyhalothrin @ 71+14 g a.i./ha and novaluron + lambda cyhalothrin @ 47+10 g a.i./ha and found
statistically at par with each other. Two foliar applications of test insecticide at standard and double dose
did not showed any phyto-toxic symptoms. The initial deposits of 0.567 and 1.241 mg/kg of novaluron and
0.282 and 0.531 mg/kg of lambda cyhalothrin were recorded at the standard and double dose after second
application of combination product of novaluron and lambda cyhalothrin. Novaluron residues persisted
upto 10 and 15 days whereas residues of lambda cyhalothrin persisted upto 5 and 7 days at standard and
double dose, respectively in tomato fruits. The residues of both novaluron and lambda cyhalothrin in fruits
reduced to half in less than 3 days. Novaluron and lambda cyhalothrin residues were found below
determination level in tomato field soil at 20th day after last application of both the doses. From the
consumer safety point of view, the safe waiting period of 15 days was suggested for the combination
product of novaluron and lambda cyhalothrin for tomato.
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