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<p>A field experiment was conducted at the ICAR-Research Complex for Eastern Region, Farming System Research Centre for Hill and Plateau Region, Ranchi, Jharkhand, to investigate the population dynamics and the bio-intensive management of the mango hopper, <i>Idioscopus nagpurensis</i> (Pruthi) (Cicadellidae: Hemiptera), under high density planting system conditions of mango during the flowering to fruit harvesting period (January to June) of the Amrapali cultivar in 2023 and 2024. The study aimed to elucidate the temporal patterns of hopper abundance, identify key climatic determinants influencing its population dynamics, and assess the efficacy of selected insecticidal molecules. A total of 10 orchards were selected for population dynamics studies, in which each orchard contained 300 Amrapali trees, which were 25–30 years old and spaced at 2.50 × 2.50&#xa0;m. Peak hopper populations were observed during the 18th SMW in 2023 (16.50 hoppers/inflorescence) and the 20th SMW in 2024 (17.70 hoppers/inflorescence). Significant positive correlations were recorded between hopper population with maximum (0.74**, 0.79**) and minimum temperatures (0.92**, 0.70**) across years. The optimal temperature range favouring rapid multiplication was identified as <i>T</i><sub>max</sub> = 33.90–37.01&#xa0;°C and <i>T</i><sub>min</sub> = 19.80–26.03&#xa0;°C. Side by side, twelve insecticides were sprayed in a randomized block design (RBD) pattern with three replications in a separate orchard and evaluated based on their impact on hopper suppression, <i>Apis</i> sp. abundance, and marketable fruit yield. Clothianidin 50% WDG @ 0.03% a.i. exhibited the highest efficacy, followed by Imidacloprid 17.80% SL @ 0.005% a.i., Dinotefuran 20% SG @ 0.006% a.i., and Azadirachtin 3000 PPM @ 0.15% a.i. among pesticides. While Clothianidin significantly reduced hopper populations, Azadirachtin and entomopathogenic fungi were comparatively safer for the pollinator, i.e. <i>Apis</i> sp. The findings underscore the role of climatic factors in hopper outbreaks and support the rotational use of Clothianidin, Imidacloprid, Dinotefuran, and Azadirachtin with pollinator-sensitive application timing during Amrapali flowering.</p>

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Studies on population dynamics and bio-intensive management of the mango hopper, Idioscopus nagpurensis (Pruthi) (Cicadellidae: Hemiptera) under high-density planting system conditions of the Eastern hill and plateau region of India

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Arbud Lala,
  • Archita Das

摘要

A field experiment was conducted at the ICAR-Research Complex for Eastern Region, Farming System Research Centre for Hill and Plateau Region, Ranchi, Jharkhand, to investigate the population dynamics and the bio-intensive management of the mango hopper, Idioscopus nagpurensis (Pruthi) (Cicadellidae: Hemiptera), under high density planting system conditions of mango during the flowering to fruit harvesting period (January to June) of the Amrapali cultivar in 2023 and 2024. The study aimed to elucidate the temporal patterns of hopper abundance, identify key climatic determinants influencing its population dynamics, and assess the efficacy of selected insecticidal molecules. A total of 10 orchards were selected for population dynamics studies, in which each orchard contained 300 Amrapali trees, which were 25–30 years old and spaced at 2.50 × 2.50 m. Peak hopper populations were observed during the 18th SMW in 2023 (16.50 hoppers/inflorescence) and the 20th SMW in 2024 (17.70 hoppers/inflorescence). Significant positive correlations were recorded between hopper population with maximum (0.74**, 0.79**) and minimum temperatures (0.92**, 0.70**) across years. The optimal temperature range favouring rapid multiplication was identified as Tmax = 33.90–37.01 °C and Tmin = 19.80–26.03 °C. Side by side, twelve insecticides were sprayed in a randomized block design (RBD) pattern with three replications in a separate orchard and evaluated based on their impact on hopper suppression, Apis sp. abundance, and marketable fruit yield. Clothianidin 50% WDG @ 0.03% a.i. exhibited the highest efficacy, followed by Imidacloprid 17.80% SL @ 0.005% a.i., Dinotefuran 20% SG @ 0.006% a.i., and Azadirachtin 3000 PPM @ 0.15% a.i. among pesticides. While Clothianidin significantly reduced hopper populations, Azadirachtin and entomopathogenic fungi were comparatively safer for the pollinator, i.e. Apis sp. The findings underscore the role of climatic factors in hopper outbreaks and support the rotational use of Clothianidin, Imidacloprid, Dinotefuran, and Azadirachtin with pollinator-sensitive application timing during Amrapali flowering.