Author: Lalit Kumar and D.R. Thakur
Download PDF
This study reveals the biology and developmental history of Harmonia eucharis (Mulsant), (Coleoptera: Coccinellidae), a native ladybug species with significant potential in aphid control. Studies conducted under controlled laboratory conditions (24±1°C, 65±2% RH with 16:8 L:D photoperiod) and observed that the beetle completes its life cycle from egg to adult in about 28-29 days. Incubation period lasted for 5.2±0.83 days, followed by four larval instars, a pre-pupal stage, and a pupal phase lasting 6.4±0.89 days. The total development time reflects rapid predatory adaptation. Adult males and females lived for 16.8±2.94 and 18±3.08 days, respectively. Results indicate a high predatory potential and reproductive efficiency, making H. eucharis a promising candidate for inclusion in integrated pest management strategies. Observations also highlight its compatibility with Indian agro-ecosystems, particularly in high-altitude regions. This study reinforces the importance of utilising native biological agents for sustainable pest control and reducing dependency on exotic or chemical alternatives. Maintaining consistent prey density and environmental conditions posed challenges, slightly affecting developmental uniformity. the study establishes vital baseline insights into the biology, adaptability, and predatory potential of Harmonia eucharis, reinforcing its promise as a native, eco-friendly biocontrol agent for sustainable pest management in Indian agro-ecosystems.
Harmonia eucharis, coccinellids, biological control, aphid IPM
The present study establishes that H. eucharis completes its life cycle through rapid metamorphosis, enabling multiple generations within a season. Each developmental stage, particularly the larval and adult phases, exhibits strong predatory potential. Adults consumed an average of 78.2 ± 1.77 aphids daily and maintained high survival rates. Their active dispersal and sustained feeding behaviour highlight H. eucharis as an efficient, ecologically valuable biocontrol agent against aphid infestations.
-
Lalit Kumar and D.R. Thakur (2025). Life History Traits and Biocontrol Potential of Harmonia eucharis (Coleoptera: Coccinellidae). International Journal of Theoretical & Applied Sciences, 17(2): 115–119.
Indexing