Studies on Biology and Efficacy of Bio-rational insecticides against shoot and fruit borer,Leucinodes orbonalis Guenee ib BRINJAL
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Date
2020-10-28
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ANDUAT, Kumarganj, Ayodhya
Abstract
The present investigations were carried out during the Rabi 2017-18 and 2018-19
seasons at Student’s Instructional Farm, A. N. D. University of Agriculture and Technology,
Kumarganj, Ayodhya (U.P.). The four major insects viz., Jassid (A. biguttula biguttula),
White fly (Bemacia tabaci), Hadda beetle (Henosepilachna vigintioctopunctata) and brinjal
shoot and fruit borer (L. orbonalis) were recorded. The maximum population of brinjal shoot
and fruit borer 5.37 & 4.95 larvae /plant was recorded in 15th SW of 2017-18 & 2018-19
followed by 4.68 & 4.92 larvae/plant of brinjal shoot and fruit borer was recorded in 14th
SW of 2017-18 & 2018-19 and minimum population of brinjal shoot and fruit borer 0.31 &
0.35 larvae /plant was recorded in 21st SW of 2017-18 & 2018-19 followed by 20th SW of
2017-18 & 2018-19 larval population of brinjal shoot and fruit borer 0.63 & 0.59
larvae/plant.
Among the various insecticides evaluated against brinjal shoot and fruit borer (L.
orbonalis), Spinosad 45 SC @ 73g a.i./ha treated plots showed lowest infestation and gave
higher fruit yield (253.12) followed by Indoxacarb 14.5 SC (229.33). The boipesticide
NSKE 5% most effective followed by Bacillus thuringensis and Beauveria bassiana. The
highest cost: benefit ratio was obtained from NSKE 5% (1:24.40) followed by Indoxacarb
14.5 SC (1:24.13) which were also economical than other treatments.
On the basis of per cent shoot infestation Spinosad 45 SC was found most effective
insecticide with lower infestation followed by Indoxacarb 14.5 SC > NSKE 5%
>Chlorfenapyr 1.9 EC >Bacillus thuringensis >Karanj seed extract>Beauveria bassiana
>Neem oilcompared to control, all the treatments were found effective and significantly
superior over the control. Based on per cent fruit infestation on brinjal, Indoxacarb 14.5
SCwas most effective followed by Spinosad 45 SC>Chlorfenapyr 1.9 EC > NSKE 5%
>Bacillus thuringensis >Karanj seed extract>Beauveria bassiana>neem oil, control.
Indoxacarbwas found significantly superior to other insecticides. Spinosad and Chlorfenapyr
were found next effective insecticides.
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