Abstract


Volume 6, Issue 5, October Issue - 2018, Pages:774-781


Authors: Pitou Woklin Euloge KONE, Gouzou Juste Roland DIDI, Germain Elisabeth Cynthia OCHOU, Malanno KOUAKOU, Kouadio Kra Norbert BINI, Dagnogo MAMADOU, Ochou Germain OCHOU
Abstract: Jacobiella facialis is a sucking insect pest of cotton in Côte d’Ivoire. Heavy infestations on cotton resulted in shedding of leaves, squares, young bolls and subsequently lead to significant yield losses. In recent years, attacks of the jassid remain persistent throughout the entire crop cycle despite insecticide treatments. Susceptibility tests of ten (10) active ingredients (chlorpyrifos-ethyl, profenofos, acetamiprid, imidacloprid, alpha-cypermethrin, lambdacyhalothrin, spinoteram, sulfoxaflor, spinosad and chlorantraniliprole) were performed against pest populations collected in Bouaké by leaf-dip method n° 15 proposed by Insecticide Resistance Action Commitee (IRAC 15, version 3). Lethal concentrations LC50 and LC90 were determined for all active ingredients. To compare susceptibility between different field strains, discriminate concentrations (LC90) for the most toxic active ingredients were tested by the same method on jassid populations from five localities (Korhogo, Boundiali, Ferké, Ouangolo and Niakara). Five active ingredients, chlorpyrifos-ethyl, profenofos, acetamiprid, alpha-cypermethrin and imidacloprid, with respective lethal concentrations (LC50) of 0.0012, 0.011, 0.024, 0.057, 0.070 mg/ml, were the most toxic to jassid, while spinosad and chlorantraniliprole were the least toxic as LC50 values were 1.616 mg/ml and 5.4 mg/ml respectively. Data collected on discriminate concentrations (LC90) for four active ingredients did not revealed any significant difference between the susceptibility levels of jassid strains. However, it was noted that survival rates were consistently high in strain collected from Boundiali and Korhogo, indicating low heterogeneity within some field populations. The results have provided important information on active ingredients to consider when developing pest management programs.
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