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<p>Oviposition deterrents are the semiochemicals that provide the first line of defense by modifying the behavior of conspecific females. In the present study, the oviposition deterrent effect of four fatty acids (linoleic, palmitic, myristic and stearic acid) and six vegetable oils (groundnut, rice bran, safflower, sesame, soybean and sunflower) having fatty acids was confirmed in bioassays under laboratory conditions at different concentrations against the old-world bollworm <i>Helicoverpa armigera</i>. The value of the avoidance index (Ai) and percent effective deterrence (PED) confirmed the role of fatty acids and vegetable oils as an oviposition deterrent. It was found that there was a negative correlation between the ratio of the number of eggs laid and the concentrations of fatty acids tested against <i>H. armigera</i>. The efficacy of fatty acids and vegetable oils as oviposition deterrents concerning Ai and PED was observed. The highest Ai and PED values were observed in palmitic acid (Ai = 0.57, PED = 73%), followed by myristic acid (0.53, 69%), while linoleic acid (0.51, 67%) exhibited the lowest values. Likewise, in the vegetable oil bioassay experiment, sunflower showed the highest Ai and PED (0.50, 66%) values, followed by safflower oil (0.48, 65%), whereas rice bran and soybean (0.43, 60%) exhibited the lowest values. Validation of the present findings was demonstrated by the field studies conducted during 2019–2020, 2020–21, and 2021–22 growing seasons. The results of the field study ensured the effectiveness of vegetable oils as an oviposition deterrent by reducing egg-laying at all concentrations (1%, 2%, and 4%). Even at higher concentrations (2 and 4%), certain oils proved more efficacious than insecticides. Among the treatments, rice bran, sunflower, soybean, and groundnut oils showed promising results, performing on par with the insecticides with a comparable benefit–cost ratio. Hence, the present work manifests vegetable oils as a promising oviposition deterrent and proves their proficiency in the ethological pest management of <i>H. armigera</i>.</p>

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Evaluation of vegetable oil as oviposition deterrent for management of old-world bollworm, Helicoverpa armigera (Hübner) in cotton

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Rachna Pande,
  • Shah Vivek,
  • T. Prabhulinga,
  • Shivaji Thube,
  • Pooja Ghonge,
  • G. T. Behere,
  • Y. G. Prasad

摘要

Oviposition deterrents are the semiochemicals that provide the first line of defense by modifying the behavior of conspecific females. In the present study, the oviposition deterrent effect of four fatty acids (linoleic, palmitic, myristic and stearic acid) and six vegetable oils (groundnut, rice bran, safflower, sesame, soybean and sunflower) having fatty acids was confirmed in bioassays under laboratory conditions at different concentrations against the old-world bollworm Helicoverpa armigera. The value of the avoidance index (Ai) and percent effective deterrence (PED) confirmed the role of fatty acids and vegetable oils as an oviposition deterrent. It was found that there was a negative correlation between the ratio of the number of eggs laid and the concentrations of fatty acids tested against H. armigera. The efficacy of fatty acids and vegetable oils as oviposition deterrents concerning Ai and PED was observed. The highest Ai and PED values were observed in palmitic acid (Ai = 0.57, PED = 73%), followed by myristic acid (0.53, 69%), while linoleic acid (0.51, 67%) exhibited the lowest values. Likewise, in the vegetable oil bioassay experiment, sunflower showed the highest Ai and PED (0.50, 66%) values, followed by safflower oil (0.48, 65%), whereas rice bran and soybean (0.43, 60%) exhibited the lowest values. Validation of the present findings was demonstrated by the field studies conducted during 2019–2020, 2020–21, and 2021–22 growing seasons. The results of the field study ensured the effectiveness of vegetable oils as an oviposition deterrent by reducing egg-laying at all concentrations (1%, 2%, and 4%). Even at higher concentrations (2 and 4%), certain oils proved more efficacious than insecticides. Among the treatments, rice bran, sunflower, soybean, and groundnut oils showed promising results, performing on par with the insecticides with a comparable benefit–cost ratio. Hence, the present work manifests vegetable oils as a promising oviposition deterrent and proves their proficiency in the ethological pest management of H. armigera.