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Seasonal population dynamics of cocoa stem borer Eulophonotusmyrmeleon felder (Lepidoptera: Cossidae) in the region of the Indénié-Djuablin in Côte D'ivoire

Author: 
N’Guessan Assiènin Hauverset, N’Guessan Kouamé François, Kouassi Kouassi Philippe and KouaméN’ Dri Norbert
Subject Area: 
Life Sciences
Abstract: 

Objective: The cocoa stem borer, Eulophonotusmyrmeleon Felder causes today serious damage in cocoa farm in Côte d’Ivoire. This study was conducted to determine the outbreak periods of this new lepidopteran pest in the Indénié-Djuablin region, the second largest cocoa producing area in Côte d'Ivoire. Methodology and Results: The study was conducted from 2009 to 2013 in farmers’ cocoa farms of the Indénié-Djuablin region in Côte d'Ivoire. Changes in the population density and attack rates ofE. Myrmeleon were assessed by counting fresh holes in six cocoa farms chosen in 3 localities with 2 farms in each locality. The data of Rainfall and temperature were also collected during this study. The results showed that there are two periods of severe attacks of this pest during the year, in the Indénié-Djuablin region. These periods occur from December to April with a peak in February and May to November with a peak around July-August. During these periods, the larval population level is high in the cocoa farms, indicating intense larval activities in the farms. The results also showed that the level of attack increased in 2009 than in other years. Rainfall seems to play a significant role in the population rise of the insect as periods of heavy attacks were observed after periods of high rainfalls. Similarly, the lower temperatures seemed to favor an increase in E.myrmeleon attack. Conclusion and Applications: The results obtained in this study could be very useful for recommending control measures against larvae or adults. Indeed, periods of heavy attacks and adult emergence could be taken into account for rational insecticide application against this pest.

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