Influences of Host Plants and Shade on the Outbreak of Analeptes Trifasciata F. On Cashew Plantations in the Center-North of Côte d'Ivoire

Siela Kone, Nygble Angèle Sika-Piba, Mamadou Dagnogo, Kouassi Allou

Abstract


Cashew cultivation in certain areas of the Ivory Coast is facing significant damage from the double chisel of cashew trees (Analeptes trifasciata). This study determined the influence of host plants and leaf shade on insect outbreaks in plantations. In each of the 4 plantations (Méhankaha, Yakoukaha, Kéminkaha and Konékaha), two paths following the diagonals of the plots were traced using machetes up to 100 m in the bush surrounding the plots. All the trees, shrubs and plant suckers cut from these 5 m wide lines were prospected from the trunk (stem) to the leaves, passing through the branches and twigs. Then in each of these 4 plantations, it was a matter of evaluating the average number of individuals of the insect in dead branches on the ground under shade, in dead branches on the ground in the sun and in dead branches hanging in the trees. Branches (under shade and in the sun). This study showed that adults of A. trifasciata feed in addition to cashew trees, various host plants. Host plants attacked by the insect are Spondias monbin (Anacardiaceae), Terminalia macroptera (Combretaceae), Ficus capensis (Moraceae), Mangifera indica (Anacardiaceae), Sterculia tragacantha (Sterculiaceae), and Ceiba pentandra (Bombacaceae). Beyond food intake, only host plants such as Spondias monbin (Anacardiaceae), Terminalia macroptera (Combretaceae) and Ceiba pentandra (Bombacaceae) have been branched by insects. The presence of these host plants in the vicinity of cashew plots would therefore promote the maintenance and proliferation of the insect in the plantations. In addition to the host plants, the study showed that maintaining extensive shade in the plantations due to a high density of the plantations favored a high outbreak of the larval populations of A. trifasciata in cut branches. On the other hand, significant lighting of the plantations favoring the penetration of solar rays would significantly reduce the number of larval individuals per dead branch

Keywords


Cashew trees, Analptes trifasciata, Côte d’Ivoire, insects, pullulation

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