Seasonal incidence and comparative efficacy of insecticides against leafhopper (Amrasca biguttula biguttula) and Whitefly (Bemisia tabaci) on okra (Abelmoschus esculentus)

K S ISHWARYA  LAKSHMI; C N  RAJARUSHI; B V JAYANTH; SHASHIKALA M; VOODIKALA S  AKHIL

doi:10.56093/ijas.v95i2.150910

Authors

K S ISHWARYA LAKSHMI Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj, Uttar Pradesh 211 001, India
C N RAJARUSHI 2ICAR-Indian Agricultural Research Institute, New Delhi
B V JAYANTH ICAR-Indian Agricultural Research Institute, New Delhi
SHASHIKALA M ICAR-Indian Agricultural Research Institute, New Delhi
VOODIKALA S AKHIL ICAR-Indian Agricultural Research Institute, New Delhi

https://doi.org/10.56093/ijas.v95i2.150910

Keywords:

Correlation, Kharif, Okra, Regression, Weather factors

Abstract

The field study was carried out during the rainy (kharif) seasons of 2019 and 2020 at Sam Higginbottom University of Technology and Sciences, Prayagraj, Uttar Pradesh to investigate the seasonal incidence of whitefly (Bemisia tabaci) and leafhopper (Amrasca biguttula biguttula) on okra [Abelmoschus esculentus (L.) Moench] and evaluated the effectiveness of various insecticides. The experiment was laid out in a completely randomized block design (CRBD) in three replications having following treatments, viz. T1, Buprofezin 25% ec @0.6 ml/L; T₂, Thiamethoxam 25% wg @0.3 ml/L, T₃, Imidacloprid 17.8% sl @0.2 ml/L, T₄, Triazophos 40 ec @1 ml/L, T₅ Quinalphos 25 ec @2 ml/L; T₆, Acetamiprid 20% sp @0.5 ml/L; T₇, Fenpropathrin 30% ec @0.4 ml/L; T₈, Untreated control. For both experiments, the Arka Anamika variety of okra was used. Whitefly populations peaked at 17.26/plant in early October, while leafhopper populations reached 18.06/plant in late September. Correlation analysis revealed a significant negative relationship between pest populations and mean temperature, particularly for whiteflies (r = -0.68 in 2019 and r = -0.60* in 2020 for the current week, with stronger correlations observed with 1 and 2-week lags). Leafhopper populations exhibited a significant negative relationship with temperature (r = -0.66* in 2019) and a positive association with relative humidity (r = 0.67 in 2020). Linear regression models indicated that temperature accounted for 52.35% and 58.7% of whitefly population variability and 50.24% and 48.82% for leafhoppers in 2019 and 2020, respectively. Among the insecticides tested, acetamiprid effectively reduced whitefly populations by 81.80%, while buprofezin reduced leafhopper populations by 85.63%. Imidacloprid demonstrated the highest cost-benefit ratio, with yields of 115.35 q/ha in 2019 and 113.25 q/ha in 2020.

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