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Journal of Entomology

Year: 2016 | Volume: 13 | Issue: 5 | Page No.: 161-169
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Authors

Deo Gracias Zoclanclounon

Armand A. Paraiso

Julien Boulga

Franck Akogbeto

Gregoire Paraiso

Constantin Yeyi

Keywords

Background and Objective: Protection and preservation of bees are a pledge in a sustainable and environment-friendly agriculture. The economic contribution of the insect’s pollinators to world agriculture is estimated at billions of dollars. However, non-judicious choice of pesticides and absence of good plant protection practices, represent a real danger to bees. The objective of this study was to assess the toxicity of three insecticides commonly used in cotton protection on bees Apis mellifera adansonii in Benin. Materials and Methods: In this context, bees were taken from hives and transported to the laboratory. Active ingredients and different doses used were as followed: Emamectin benzoate, beta-cyfluthrin+imidacloprid and lamdex+chlorpyrifos at doses of: 2150 nanograms per bee, 125 nanograms per bee, 75, 50, 25, 12.5×103, 6, 2.5 and 1.25-0.96 ng per bee, depending on the active ingredient. Each treatment included three replications consisting of 25 bees. Bees were anaesthetized with ether before treatment. Each bee received by topical application on the pronotum, 1 μL of the formulation. Results: Observations were made after 2, 10, 24 and 48 h. Results indicated that, even the lowest doses of the pesticides: 0.96, 7.25 and 21.5 ng per b showed mortality higher than 90% to bees, 48 h after application. An insecticide with active ingredients including beta-cyfluthrin (45 g L–1), which is a pyrethroid and Imidacloprid (100 g L–1), a neonicotinoid actually forbidden in many European countries showed very high toxicity to honey bees, indicating values of the LD50 varying from 19.9 ng per bee for 10 h exposure to 1.1×10–2 ng per bee for 18 h and 5×10–4 ng per bee for 36 h. Conclusion: Results of the study indicated the urgent need of good plant protection practices in the frame of sustainable agriculture and bee’s preservation and conservation. Promotion of strategies as part of the dissemination of good agricultural practices in plant protection is a guarantee which should ensure sustainable agriculture and environmental, human and biodiversity protection. These studies showed the urgency of the integrated plant protection in order to promote good agricultural practices for honey bee’s protection.
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How to cite this article

Deo Gracias Zoclanclounon, Armand A. Paraiso, Julien Boulga, Franck Akogbeto, Gregoire Paraiso and Constantin Yeyi, 2016. Toxicity to Honey Bees Apis mellifera Adansonii of Three Insecticides Used in Cotton Cultivation in Benin. Journal of Entomology, 13: 161-169.

DOI: 10.3923/je.2016.161.169

URL: https://scialert.net/abstract/?doi=je.2016.161.169

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