Skip to Main content Skip to Navigation
New interface
Theses

Contribution à l'amélioration de la lutte contre le miride du cacaoyer Sahlbergella singularis Hagl. (Hemiptera : Miridae). Influence des facteurs agro-écologiques sur la dynamique des populations du ravageur

Abstract : This work aims at better understanding the mecanisms and agro-ecological factors involved in the Sahlbergella singularis population dynamics in farm. Life table analysis conducted on a rearing population showed that S. singularis is a slow growing species. This result could explain the low densities of S. singularis populations in cocoa farms. The study of S. singularis demographic parameters showed that fecundity is a key-parameter of the seasonal variations of natural populations. Indeed, the high reproductive potential of females, due to optimal food supply and climatic conditions, may largely explain the growth of natural populations. Our work revealed that the density of S. singularis populations in farms depends on agro-ecological conditions of cocoa production. Among cultural practices, spraying of insecticides, shade management and resort to hybrid varieties were the main factors influencing mirid density. The study of the impact of shade on mirid spatial distribution showed that mirids were aggregated in those areas where sunlight was highest. The infested areas, identified as mirid pockets, could be an infestation source for the surrounding farms. Our results also showed that large forest trees had a tendency to homogenize exposure to sunlight in plots and then to limit the development of mirid pockets. Overall, our study revealed that chemical control and shade management recommendations for cocoa mirids were seldom applied by farmers. Therefore, we discussed our results to fit recommendations to current cocoa production context in Cameroon
Document type :
Theses
Complete list of metadata

Cited literature [207 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00871800
Contributor : Régis Babin Connect in order to contact the contributor
Submitted on : Thursday, October 10, 2013 - 3:24:47 PM
Last modification on : Friday, October 8, 2021 - 4:26:15 PM
Long-term archiving on: : Saturday, January 11, 2014 - 4:21:01 AM

Identifiers

  • HAL Id : tel-00871800, version 1

Collections

Citation

Régis Babin. Contribution à l'amélioration de la lutte contre le miride du cacaoyer Sahlbergella singularis Hagl. (Hemiptera : Miridae). Influence des facteurs agro-écologiques sur la dynamique des populations du ravageur. Zoologie des invertébrés. Université Paul Valéry - Montpellier III, 2009. Français. ⟨NNT : ⟩. ⟨tel-00871800⟩

Share

Metrics

Record views

901

Files downloads

3679