and bioefficacy of individual and combination of diversified insecticides
against jute hairy caterpillar, Spilarctia obliqua
K. Selvaraj*, V.
Ramesh Babu., B.S. Gotyal and S. Satpathy
Research Institute for Jute and Allied Fibres (CRIJAF), Kolkata-700 120,
Author?s E-mail : firstname.lastname@example.org
17 April 2014
09 December 2014
20 March 2015
of conventional (profenofos 50 EC and λ-cyhalothrin 5 EC) and
non-conventional (flubendiamide 480 SC, chlorantraniliprole 18.5 SC,
emamectin benzoate 5 SG) insecticides was determined on the basis of median
lethal concentration (LC50) values on third instar larvae of jute
hairy caterpillar, Spilarctia obliqua? under laboratory conditions. Further,
the promising binary insecticides combinations with lesser LC50
values and adequate synergistic activity were evaluated under field
conditions. The LC50 values calculated for insecticides viz.,
chlorantraniliprole, flubendiamide emamectin benzoate, λ-cyhalothrin and
profenophos were 0.212, 0.232,? 0.511,? 0.985 and? 3.263 ppm, respectively.
Likewise, the LC50 values for flubendiamide with λ-cyhalothrin in 3:1
proportion was most toxic (0.103 ppm) amongst all the other binary
combinations with λ-cyhalothrin.? Chlorantraniliprole in combination
with λ-cyhalothrin at 1:1 proportion (0.209 ppm) was most toxic followed
by 3:1 proportion (0.345 ppm). Similarly, emamectin benzoate in combination
with λ-cyhalothrin at 1:1 proportion was more toxic (0.271 ppm) than 3:1
ratio (0.333 ppm). Toxicity index of flubendiamide + λ-cyhalothrin (3:1
ratio) was highest (970.87). Bioefficacy of synergistic binary combinations
along with individual insecticides established the superiority of profenophos
+ λ-cyhalothrin (3:1) with 89.12% reduction in infestation and recorded
maximum fibre yield 38.67qha-1 under field condition. Moreover, combination
of diverse insecticides group might sustain toxicity against the target
insect for longer period with least probability of resistance development. ?????
Insecticides, Median lethal concentration, Spilarctia obliqua,?
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