BIOEFFICACY, PERSISTENCE AND RISK MITIGATION STUDIES OF CERTAIN NEWER INSECTICIDES AGAINST BRINJAL SHOOT AND FRUIT BORER
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Date
2020
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PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY
Abstract
The study entitled “Bioefficacy, Persistence and Risk Mitigation Studies of
Certain Newer Insecticides Against Brinjal Shoot and Fruit borer, Leucinodes orbonalis
Guenee (Lepidoptera : Pyralidae)” was conducted during kharif 2019-20. The field
studies on the efficacy of six insecticides viz., flubendiamide 240 SC + thiacloprid 240
SC @ 60 g a.i. ha-1
and 60 g a.i. ha-1
, flubendiamide 90 SC + deltamethrin 60 SC @ 22.5
g a.i. ha-1
and 15 g a.i. ha-1
, lambda cyhalothrin 5 EC @ 15 g a.i. ha-1
, chlorantraniliprole
18.5 SC @ 41.625 g a.i. ha-1
, thiodicarb 75 % WP @ 750 g a.i. ha-1
and flubendiamide
480 SC @ 90 g a.i. ha-1were evaluated against brinjal shoot and fruit borer, Leucinodes
orbonalis at College farm, College of Agriculture, Rajendranagar, Hyderabad. Whereas,
studies on dissipation pattern and decontamination methods of two effective insecticides
viz.,chlorantraniliprole 18.5 SC @ 41.625 g a.i. ha-1
and flubendiamide 480 SC @ 90 g
a.i. ha-1 was carried out at laboratory of All India Network Project on Pesticide Residues,
PJTSAU, Rajendranagar, Hyderabad during kharif 2019-20.
Among different insecticides evaluated against brinjal shoot and fruit borer,
chlorantraniliprole 18.5 SC @ 41.625 g a.i. ha-1 was found to be most effective recording
lowest mean per cent fruit infestation (13.85, 9.12 and 5.70) on number basis after first,
second and third spray which was statistically superior over rest of the treatments
followed by flubendiamide 480 SC @ 90 g a.i. ha-1
(18.87, 14.26 and 9.42) and lambda
cyhalothrin 5 EC @ 15 g a.i. ha-1
(26.88, 19.64 and 12.38) after first, second and third
spray, respectively on number basis.
Least per cent fruit infestation by shoot and fruit borer on weight basis after first,
second and third spray was recorded with chlorantraniliprole 18.5 SC @ 41.625 g a.i.
ha-1 (9.30, 7.83 and 6.98) followed by flubendiamide 480 SC @ 90 g a.i.ha-1 (11.39,
10.41 and 9.42) and lambda cyhalothrin 5 EC @ 15 g a.i. ha-1
(14.25, 14.30 and 11.52),
respectively during kharif 2019-20.
Though highest brinjal fruit yield was recorded from chlorantraniliprole 18.5 SC @
41.625 g a.i. ha-1 treated plot (242.33 q/ha) followed by flubendiamide 480 SC @ 90 g
a.i.ha-1
(221.86 q/ha), incremental cost benefit ratio was highest for lambda cyhalothrin
5 EC @ 15 g a.i. ha-1
(1: 15.06) followed by flubendiamide 480 SC @ 90 g a.i. ha-1
(1:10.25).
Initial deposits of chlorantraniliprole 18.5 SC @ 41.625 g a.i. ha-1 and
flubendiamide 480 SC @ 90 g a.i. ha-1
in brinjal fruits after three sprays were 1.071 and
0.948 mg/kg, respectively which dissipated to less than limit of quantitation of 0.05
mg/kg at 10 days, respectively with half lives of 3.35 days for chlorantraniliprole and
3.16 days for flubendiamide, respectively.
Cooking in pressure cooker for 10 min was the effective decontamination method
for removal of 81.92 to 89.91 per cent residues of chlorantraniliprole 18.5 SC @ 41.625
g a.i. ha-1 and flubendiamide 480 SC @ 90 g a.i. ha-1
, while least effective
decontamination method was treating brinjal fruits with 4 % acetic acid removed 14.10
and 51.56 per cent, of the residues.
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Citation
D10,631