Assessment of the Effect of Cacao Agrosystems and Farmers' Practices on Mirid abundance and Their Damages on Cacao Trees under Unshaded Conditions in the Southern Cameroon

Mahob Raymond, Begoude B.A.D., Dibog Luc, Babin Régis, Ndoumbè Nkeng Michel, Voula Audrey Valtery, Nyassé Salomon, Fotso, Nsoga P., Feudjio R., Bilong Charles Félix Bilong. 2017. Assessment of the Effect of Cacao Agrosystems and Farmers' Practices on Mirid abundance and Their Damages on Cacao Trees under Unshaded Conditions in the Southern Cameroon. In : Livre des résumés de la 22ème Réunion et Conférence de l’Association Africaine des Entomologistes : “Vers une amélioration du bien-être humain grâce à la gestion de la diversité des insectes dans un monde en mutation”. Omondi Aman Bonaventure (ed.), Kekeunou Sévilor (ed.), Ouali-N’goran Mauricette (ed.), Salah Faiza Elgaili Elhassan (ed.), Tanga Mbi Chrysantus (ed.), Getu Emana (ed.), Zanou Elisabeth (ed.), Ayelo Pascal (ed.). Wad Medani : AAIS, Résumé, 44. 22nd Meeting and Conference of the African Association of Insect Scientists, Wad Medani, Soudan, 23 Octobre 2017/26 Octobre 2017.

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Résumé : Mirid populations and their damages on cacao production have been widely studied in farms found under shaded conditions worldwide. The recent establishment of unshaded cacao plantations in Cameroon provided us the opportunity to assess the mirid abundance and damage in nine farms in three locations, from savannah to forest zones, in two consecutive years. Mirid abundance was assessed by visual counts of individuals and damage by scoring dry leaves on branches and cankers on twigs and trunks of trees. All mirids observed belonged to the species Sahlbergella singularis (Hemiptera Miridae). Generally, mirid numbers were low (0.26 ± mirid tree-1 for year 1 and 0.35 ± mirid tree-1 for year 2) and significantly lower in the Savannah zone (0.24 mirid cacao tree-1) than the transition zone (0.51 mirid cacao tree-1) and the forest zone (0.60 mirid cacao tree- 1). The Mirid damages was varied significantly (p<0.05) between plots, sites and years. However, damage due to cankers were very high (average median score: 1.20) compared to dry leaves ones (0.51). Our study showed a negative relationship between mirid abundance on cacao trees and the severity of their damages; this suggests that the observed damage are not only caused by the in situ mirid populations; but by a synergistic action of exogenous factors. These results contributed to a better understanding of the mirid ecology under unshaded conditions and should be taken into consideration when designing integrated pest management schemes against mirids.

Classification Agris : H10 - Ravageurs des plantes
F08 - Systèmes et modes de culture

Auteurs et affiliations

• Mahob Raymond, Université de Yaoundé 1 (CMR)
• Begoude B.A.D., IRAD (CMR)
• Dibog Luc, IRAD (CMR)
• Babin Régis, CIRAD-BIOS-UPR Bioagresseurs (KEN) ORCID: 0000-0002-3753-1193
• Ndoumbè Nkeng Michel, IRAD (CMR)
• Voula Audrey Valtery, IRAD (CMR)
• Nyassé Salomon, IRAD (CMR)
• Fotso, Université de Yaoundé 1 (CMR)
• Nsoga P., University of Yaounde 1 (CMR)
• Feudjio R., University of Yaounde 1 (CMR)
• Bilong Charles Félix Bilong, Université de Yaoundé 1 (CMR)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/587257/)

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