Crop loss assessment and ecofriendly management of Aphids, Aphis gossypii (Glover) on Isabgol, Plantago ovata (Forst)

Abstract

A field study entitled “Crop loss assessment and ecofriendly management of Aphids, Aphis gossypii (Glover) on Isabgol (Plantago ovata, Forsk)” was conducted during Rabi 2024–25 at the AICRP on MAP and Betelvine, MPKV, Rahuri. The bioefficacy trial comprising two foliar sprays of insecticidal and biopesticidal treatments revealed that Spinosad 45% SC was the most effective in rapidly suppressing Aphis gossypii, recording the highest seed yield (8.08 q/ha). This was followed by Abamectin 1.9% EC (7.22 q/ha) and Azadirachtin 10000 ppm (7.47 q/ha). Among the bioagents, Lecanicillium lecanii showed superior performance, achieving substantial aphid reduction and a yield of 7.13 q/ha. The yield loss assessment indicated that aphid infestation caused 29.02% reduction in seed yield of Isabgol. Economic analysis showed that Lecanicillium lecanii provided the highest incremental cost–benefit ratio (1:4.41), outperforming abamectin (1:3.56) and Beauveria bassiana (1:3.55). While chemical insecticides yielded higher outputs, their higher costs and residue concerns limit their suitability for a medicinal crop like Isabgol. In contrast, Lecanicillium lecanii emerged as an eco-friendly, residue-free and economically viable option. Botanical treatments such as azadirachtin also offered good efficacy and safety, though with moderate ICBR (1:1.40). Neem oil, neem seed extract and Metarhizium anisopliae showed comparatively lower efficacy.