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Population dynamics of the cashew leafminer, Eteoryctis gemoniella (Lepidoptera: Gracillariidae), and inventory of its parasitoids in cashew orchards of Northern Benin, West Africa

Published online by Cambridge University Press:  17 January 2018

Cyriaque Agboton ,
Alexis Onzo ,
Hermine A. Akohou ,
Georg Goergen ,
Stefan Vidal  and
Manuele Tamò
Cyriaque Agboton
Affiliation:
International Institute of Tropical Agriculture, 08 B.P. 0932, Tri Postal-Cotonou, Bénin Georg-August-University, Department of Crop Sciences/Agricultural Entomology, Göttingen, Germany
Alexis Onzo
Affiliation:
Faculté d'Agronomie, Département des Sciences et Techniques de Production Végétale, Université de Parakou, B.P. 123, Parakou, Bénin
Hermine A. Akohou
Affiliation:
International Institute of Tropical Agriculture, 08 B.P. 0932, Tri Postal-Cotonou, Bénin
Georg Goergen
Affiliation:
International Institute of Tropical Agriculture, 08 B.P. 0932, Tri Postal-Cotonou, Bénin
Stefan Vidal
Affiliation:
Georg-August-University, Department of Crop Sciences/Agricultural Entomology, Göttingen, Germany
Manuele Tamò*
Affiliation:
International Institute of Tropical Agriculture, 08 B.P. 0932, Tri Postal-Cotonou, Bénin
*
*E-mail: m.tamo@cgiar.org
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Abstract

In this study, we investigate the spatio-temporal fluctuations of the cashew leafminer Eteoryctis gemoniella Stainton, which was recently reported as one of the most devastating cashew pests in Benin. Eteoryctis gemoniella causes serious damage, especially to the young tender leaves, thus reducing the photosynthetic capacity of trees and hence their productivity. This study was carried out in three different cashew orchards in Northern Benin, West Africa, where we monitored the fluctuations of the infestation rates and population changes of E. gemoniella during a one-year cycle, from September 2010 to August 2011. In addition, we collected cashew leaves with mines to check for emergence of hymenopteran parasitoids. Our results show that infestation rates (as well as population densities of E. gemoniella) varied through time and among orchards. The most infested orchard was at Korou, whereas, the least infested was at Okoutaossé. In general, infestation rates and number of mines per leaf passed through two peaks, the first in July–August and the second in November, whereas no infestations were observed from January to June. Spatial distribution pattern of E. gemoniella within the orchards showed that this moth almost has a random distribution. Parasitoids attacking the leafminer were recovered from the samples. These were Apanteles sp., Chelonus (Microchelonus) nr. curvimaculatus Cameron (Hymenoptera: Braconidae) and Trathala sp. (Hymenoptera: Ichneumonidae). Further detailed studies on these natural enemies will be needed for evaluating their potential in controlling E. gemoniella in cashew orchards.

Keywords

BeninAnacardium occidentaleEteoryctis gemoniellacashew leafminerbiological controlparasitoids
Type
Research Paper
Information
International Journal of Tropical Insect Science , Volume 38 , Issue 2 , June 2018 , pp. 132 - 144
Copyright
Copyright © icipe 2018 

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