Application of essential oils of Ocimum gratissimum and Cymbopogon citratus as bioinsecticides for the management of two major biting‐sucking insects (Bemisia tabaci gennadius and Jacobiella fascialis jacobi) and the improvement of seed and fiber quality of cotton plants in Ivory Coast

Kobenan Koffi Christophe, Kouakou Brou Julien, Kouakou Malanno, Kone Pitou Woklin Euloge, Kouadio Ibrahime Sinan, Zengin Gokhan, Didi Roland, Ochou Germain Elisabeth Cynthia, Bini Kouadio Kra Norbert, Menozzi Philippe, Ochou Ochou Germain, Dick Acka Emmanuel. 2022. Application of essential oils of Ocimum gratissimum and Cymbopogon citratus as bioinsecticides for the management of two major biting‐sucking insects (Bemisia tabaci gennadius and Jacobiella fascialis jacobi) and the improvement of seed and fiber quality of cotton plants in Ivory Coast. Chemistry and Biodiversity, 19 (2):e202100801, 13 p.

https://doi.org/10.1002/cbdv.202100801

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Résumé : In recent years, in all cotton production areas in Ivory Coast, whitefly (Bemisia tabaci) and jassid (Jacobiella facialis), two biting sucker insects were causing depreciation of quality of the cottonseed and fiber obtained at harvest. However, the excessive use of synthetic chemical insecticides against these pests presents a danger for the sustainability of the production system. This study aims to evaluate the insecticidal efficacy of essential oils of Ocimum gratissimum and Cymbopogon citratus on B. tabaci and J. fascialis and on the technological parameters of the cottonseed and fiber. A field experiment was conducted in which essential oils of O. gratissimum and C. citratus were applied to cotton plants every two weeks from day 45 to 115 after emergence using a backpack sprayer. The effects of these extracts were compared to those of a synthetic chemical insecticide composed of acetamiprid and alphacypermethrin known under the trade name IBIS A 52 EC (positive control). After 160 days of cultivation where entomological data were collected, the seed cotton samples were harvested, ginned and submitted for analysis. O. gratissimum essential oil at concentrations of 1 and 5 % gave to the cotton plants better protection against whiteflies and jassids. In addition to the synthetic chemical, these cotton plants received a better proportion of healthy cottonseed, fat and a fiber with very good reflectivity. The essential oil of O. gratissimum could therefore be integrated into the phytosanitary protection programs of the cotton plant.

Mots-clés Agrovoc : Bemisia tabaci, Gossypium, lutte anti-insecte, insecticide biologique, huile essentielle, Cymbopogon citratus

Mots-clés géographiques Agrovoc : Côte d'Ivoire

Mots-clés complémentaires : Jacobiella facialis, Ocimum gratissimum

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

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