Impact of shade on the spatial distribution of Sahlbergella singularis in traditional cocoa agroforests

Babin Régis, Ten Hoopen Gerben Martijn, Cilas Christian, Enjalric Frank, Yédé, Gendre Pierre, Lumaret Jean Pierre. 2010. Impact of shade on the spatial distribution of Sahlbergella singularis in traditional cocoa agroforests. Agricultural and Forest Entomology, 12 (1) : pp. 69-79.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q2, Sujet : ENTOMOLOGY

Abstract : 1 Shade management is commonly considered to be an effective pest management strategy for cocoa mirids, yet shade management recommendations are not based on extensive knowledge of the mirid ecology in traditional cocoa agroforests. 2 The main objectives of the present study were an assessment of the impact of shade on the spatial distribution of mirid populations and thus the evaluation of shade management strategies. 3 Mirid densities were measured and shade was characterized for three plots located in three different agroecological zones in the Centre region of Cameroon. Mirid densities generally followed a negative binomial law. Geostatistical procedures were used to characterize spatial distribution of mirid density. Light conditions were assessed using hemispherical photography. 4 Populations of Sahlbergella singularis were highly aggregated in the plots. Semivariance analysis and kriging visualized the spatial dependence of mirid densities. Clearly distinguishable mirid pockets of 20-30 adjacent infested cocoa trees were identified in two of the three plots. 5 The high diversity of shade tree species and the large variability in density and size of shade trees resulted in a considerable heterogeneity of plot light conditions. Percentage transmitted light varied in the range 9.4-80.1% in the most heterogeneous plot. 6 For two of the three plots, mirid pockets were aggregated in those areas where light transmission was highest. In the third plot, relatively high mirid densities and the presence of an alternative host resulted in a more homogeneous distribution. The importance of these findings for improved mirid control is discussed.. (Résumé d'auteur)

Mots-clés Agrovoc : Theobroma cacao, Sahlbergella, Ombrage, Distribution spatiale, Miridae, Lutte anti-insecte, Agroforesterie

Mots-clés géographiques Agrovoc : Cameroun

Mots-clés complémentaires : Sahlbergella singularis, Distantiella theobromae

Classification Agris : H10 - Pests of plants
F08 - Cropping patterns and systems
K10 - Forestry production

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Babin Régis, CIRAD-BIOS-UPR Bioagresseurs de pérennes (CMR) ORCID: 0000-0002-3753-1193
  • Ten Hoopen Gerben Martijn, CIRAD-BIOS-UPR Bioagresseurs de pérennes (CMR) ORCID: 0000-0003-2133-3130
  • Cilas Christian, CIRAD-BIOS-UPR Bioagresseurs de pérennes (FRA)
  • Enjalric Frank, CIRAD-PERSYST-UPR Couverts permanents (MDG)
  • Yédé
  • Gendre Pierre, ISTOM (FRA)
  • Lumaret Jean Pierre, Centre national de la recherche scientifique (FRA)

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