Study on the borer complex of okra and bio-efficacy of novel insecticides against borers
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Date
2022-09-01
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Banda University of Agriculture &Technology, Banda-210001Uttar Pradesh (India)
Abstract
India is the second largest producer of vegetables and contributes 14% of the total
word production of vegetable. In India, vegetable is grown on the area of 10073 MH and
production 1, 83170 MT. Biotic constraints for productivity in subsistence crop protection
pattern. A field experiment was conducted at the Experimental Farm of Entomology, Banda
University of Agriculture& Technology, Banda 210001 during Kharif season of 2021- 2022.
Six insect pests were recorded viz. pod borer (Helicoverpa armigera), shoot and fruit borer
(Earias vittella), semilooper (Anomis flava) and in sucking group, three insect pests viz.
whitefly (Bemisiatabaci), jassid (Amrascabiguttula biguttula) and aphid (Aphis gossypii) were
observed on okra. Among these insect pests, E. vittela and H. armigera were key pest of okra.
The maximum and minimum temperature had non-significant positive correlation (0.736NS and
(0.069NS) respectively, with the larval population of the E. vittella. maximum temperature had
non-significant correlation (0.684NS) with the larval population of the H. armigera, however,
minimum temperature, relative humidity and wind velocity had non-significant correlation (-
0.226NS), (-0.294NS) and (0.723NS) respectively. At 5th day after 1st spray, in order to reduction
of E. vittela larval population, chlorantraniliprole and cyantraniliprole were at par to each other
and both treatments were significantly superior over rest of the treatments, whereas, all the
chemical treatments were significantly superior over the control. Similar trends were observed
at 10th day after 1st spray and almost similar trends were observed at 5th day and 10th day after
2
nd spray. At 5th day after 1st spray, in order to reduction of H. armigeralarval population,
chlorantraniliprole and cyantraniliprole were at par to each other and both these treatments
were significantly superior over rest of the treatments. All the treatments were significantly
superior over control. Similar trends were observed at 10th day after 1st spray and almost
similar trends were observed at 5th day and 10th day after 2nd spray. The field bio-efficacy of
chlorantraniliprole, cyantraniliprole, flubendiamide, spinetoram, emamectin benzoate and
indoxacarb were statistically at par to each other. The marketable yield of chlorantraniliprole
and cyantraniliprole were at par to each other and both these treatments were significantly
superior over rest of the treatments
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Citation
Madan Mohan Bajpeyi. 2022. Study on the borer complex of okra and bio-efficacy of novel insecticides against borers. M.Sc. Thesis