Détails de la publication

Screening of virulent isolates of entomopathogenic fungi in the control of Hymenia recurvalis Fabricius and Psara basalis Walker on Amaranthus cruentus L.

Détails de la publication

• Type:Article
• Domaine: Protection des végétaux
• Année de publication: 2022
• Auteurs: J. Toffa, Y. L. E. Loko, H. Bokossa, E. Dannon, D. Kpindou, M. Tamò
• Cultures: entomopathogenic fungi
• Couverture géographique: Bénin
• Mots clés: Amaranth, Hymenia recurvalis, Psara basalis, isolate, pathogenic

Résumé de la publication

In the Republic of Benin as in many African countries, amaranth (Amaranthus cruentus L.) is one of the most important leafy vegetables for its production, its high nutritional value and the monetary income provided to farmers. To protect this plant, synthetic insecticides are applied to control its main insect pests, Hymenia recurvalis (Fabricius, 1775) and Psara basalis (Walker, 1865). Therefore, chemical control negatively affects beneficial insects and the environment. Thus, it is urgent to develop alternative control methods for a sustainable production of amaranth. In the laboratory, was evaluated by the sensitivity of H. recurvalis and P. basalis larvae to isolates of Beauveria bassiana (Bba5648, Bba5656, Bba5654, Bba5644, Bba5645, and Bba5656), and Metarhizium anisopliae (Ma182) fungi. For that, 1 μl of the suspension of conidia at 1 x 108 conidia/ml was applied on the L3 larvae of both insects. Mortality, sporulation and leaf area consumed were recorded. The results showed that all the isolates are pathogenic on the larvae of both insect pests. However, “Bba5648” and “Bba5653” caused the highest mortalities of H. recurvalis at a short time (2 to 8 days). Fungal sporulation rates of B. bassiana on H. recurvalis ranged from 8.6 ± 1.1% (Bba5656) to 41.3 ± 2.1% (Bba5653). The highest sporulation rates of “Bba 5653” were also observed on P. basalis. The leaf areas consumed by the H. recurvalis larvae were lower for “Bba5653” (102.08 ± 12.75 mm2) than those of untreated control (712.76 ± 23.33 mm2). The study reveals that, isolate “Bba5653 “can be considered as useful microorganisms for the integrated control of H. recurvalis and P. basalis and the healthy protection of amaranth leaves.