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Department of Entomology, S.V. Agricultural College, ANGRAU, Tirupati-517 502.
The study was carried out to know the impact of weather parameters on the occurrence of lepidopteran pests in groundnut during kharif, 2021 and kharif, 2022. The highest per cent foliar damage due to Spodoptera litura (Fabricius) (46.00 and 41.45) and Helicoverpa armigera (Hubner) (27.80 and 31.16) were recorded in sown D4 crop (30th July), respectively. Correlation studies indicated that the maximum and minimum temperatures showed a negative impact on foliar damage by H. armigera and S. litura in groundnut crop sown from June first fortnight to July second fortnight (D1, D2, D3 and D4) and significant negative correlation with maximum temperature (-0.55 and -0.62) on H. armigera on groundnut sown in D2 and D4 crops, respectively. The significant negative correlation (-0.53 and – 55) on S. litura in D2 and D3 sown crops during kharif, 2021 and kharif, 2022, respectively. While the minimum temperature exhibited significant negative influence with H. armigera (– 0.60 and – 0.60) in D3 and D4 sown crops. However, minimum temperature exerted negative association (-0.64) on the influence of S. litura in D3 sown crop in kharif, 2021. During kharif, 2022, the minimum temperature exerted significant negative correlation (D1 = – 0.87, D2 = – 0.65, D3 = – 0.74 and D4 = – 0.84) on the foliar damage by H. armigera in all dates of sowing crops. The minimum temperature showed significant negative correlation (- 0.84, – 0.66 and – 0.74) which was recorded in D1, D2 and D3 sown crops. During kharif, 202, morning relative humidity exhibited a significant and positive association in D2 (0.56), D3 (0.64) and D4 (0.77) sown groundnut and evening relative humidity exhibited significant positive association in D3 (0.71) and D4 (0.69) sown crops with respect to foliar damage due to H. armigera. For S. litura morning relative humidity exhibited a significant positive association in D2 (0.56), D3 (0.66) and D4 (0.56) sown crops and evening relative humidity exhibited significant positive association in D3 (0.79) and D4 (0.57) sown crops.
KEYWORDS: Spodoptera litura, Helicoverpa armigera, dates of sowing, groundnut, kharif.