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<p>Mustard aphid, <i>Lipaphis erysimi</i> (Kalt.), is a major insect pest of <i>Brassica</i> crops, causing significant yield and oil content losses through phloem sap-sucking and viral disease transmission. Despite its economic importance, the combined influence of sowing date and varietal differences on aphid population build-up remains insufficiently characterised under north Indian field conditions. This study examined the effects of three sowing dates, early sowing (D<sub>1</sub>, 15th October), mid sowing (D<sub>2</sub>, 30th October), and late sowing (D<sub>3</sub>, 15th November) and five Indian mustard varieties, GSC-07 (V<sub>1</sub>), Laxmi-846 (V<sub>2</sub>), Durgamani (V<sub>3</sub>), Gujarat Mustard-2 (V<sub>4</sub>), and RH-119 (V<sub>5</sub>) on the population dynamics of <i>L. erysimi</i> under field conditions at the Research Farm of Lovely Professional University, Jalandhar, Punjab, during the Rabi season of 2023–2024. Late-sown crops (D<sub>3</sub>) recorded the highest aphid populations, peaking at 150.43 aphids per 10&#xa0;cm terminal shoot during the 9th Standard Meteorological Week (SMW), whereas early-sown crops (D<sub>1</sub>) peaked at 113.17 aphids during the 7th SMW. Among varieties, Gujarat Mustard-2 (V<sub>4</sub>) showed the highest peak infestation (216.67 aphids per 10&#xa0;cm terminal shoot), while Durgamani (V<sub>3</sub>) and RH-119 (V<sub>5</sub>) consistently recorded lower aphid populations across all sowing dates. The interaction of late sowing with Gujarat Mustard-2 (D<sub>3</sub>V<sub>4</sub>) resulted in the highest aphid density (256.80 aphids per 10&#xa0;cm terminal shoot). Wind speed emerged as the primary meteorological driver of aphid population build-up, with significant positive correlations observed under mid and late sowing conditions. These results demonstrate that sowing time and varietal selection are critical determinants of aphid infestation intensity in mustard, and that their combined management represents a practical, chemical-free component of Integrated Pest Management for sustainable mustard production.</p>

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Decoding aphid outbreaks: impact of sowing windows and mustard varietal diversity on the population fluctuations of mustard aphid (Lipaphis erysimi)

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Insha Muzaffar,
  • Shimpy Sarkar,
  • Arshdeep Singh

摘要

Mustard aphid, Lipaphis erysimi (Kalt.), is a major insect pest of Brassica crops, causing significant yield and oil content losses through phloem sap-sucking and viral disease transmission. Despite its economic importance, the combined influence of sowing date and varietal differences on aphid population build-up remains insufficiently characterised under north Indian field conditions. This study examined the effects of three sowing dates, early sowing (D1, 15th October), mid sowing (D2, 30th October), and late sowing (D3, 15th November) and five Indian mustard varieties, GSC-07 (V1), Laxmi-846 (V2), Durgamani (V3), Gujarat Mustard-2 (V4), and RH-119 (V5) on the population dynamics of L. erysimi under field conditions at the Research Farm of Lovely Professional University, Jalandhar, Punjab, during the Rabi season of 2023–2024. Late-sown crops (D3) recorded the highest aphid populations, peaking at 150.43 aphids per 10 cm terminal shoot during the 9th Standard Meteorological Week (SMW), whereas early-sown crops (D1) peaked at 113.17 aphids during the 7th SMW. Among varieties, Gujarat Mustard-2 (V4) showed the highest peak infestation (216.67 aphids per 10 cm terminal shoot), while Durgamani (V3) and RH-119 (V5) consistently recorded lower aphid populations across all sowing dates. The interaction of late sowing with Gujarat Mustard-2 (D3V4) resulted in the highest aphid density (256.80 aphids per 10 cm terminal shoot). Wind speed emerged as the primary meteorological driver of aphid population build-up, with significant positive correlations observed under mid and late sowing conditions. These results demonstrate that sowing time and varietal selection are critical determinants of aphid infestation intensity in mustard, and that their combined management represents a practical, chemical-free component of Integrated Pest Management for sustainable mustard production.