Leïla Bagny Beilhe

Leïla Bagny Beilhe
Cirad - La recherche agronomique pour le développement | CIRAD · UMR PHIM

PhD

About

38
Publications
9,067
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1,322
Citations
Additional affiliations
October 2006 - December 2009
University of La Réunion
Position
  • PhD Student

Publications

Publications (38)
Article
Coffee berry borer (CBB) (Hypothenemus hampei; Coleoptera: Curculionidae: Scolytinae) is a major insect pest affecting coffee cultivation that causes large economic losses worldwide. Characteristics related to its life cycle makes it very difficult to control. Usually, CBB control measures are carried out at plot scale, with almost no actions taken...
Poster
Full-text available
We assessed if adjacent land uses to coffee plantations can facilitate or prevent the dispersal of coffee berry borer (CBB). We established three 60 m long transects in 14 coffee plantations running from the coffee field to the adjacent land use. Four CBB traps (Brocap®) were located every 20 m in each transect. Transects were established in the di...
Conference Paper
Full-text available
Counting coffee berry borer (CBB) from field traps is a tedious process due to the number of traps (BROCAP®) that may be operating, the great number of individuals that can be captured in each trap, and the litter remains (moss, insects, leaves, etc.) found within the traps (Figure 1). We propose to train an object detection pipeline to detect and...
Article
Full-text available
The potential products in agroforestry coffee systems (SAFC) is valued, however, there are limited studies on the quantification of the yields, income, self-consumption value and the contribution that SAFC make to the food security of coffee farmer families in the Dominican Republic. This information would be important to improve the quality of lif...
Article
Through microclimate modifications, coffee agroforestry systems have both facilitative and inhibitory effects on the persistence of Hemileia vastatrix, a major fungal pathogen. Wind, a key element in the dispersal of H. vastatrix uredospores, is affected by shade tree presence, especially at the edge of agroforestry systems. However, little is know...
Article
Cocoa mirid, Sahlbergella singularis, is known to be one of the major pests of cocoa in West Africa. In this paper, we consider a biological control method, based on mating disrupting, using artificial sex pheromones, and trapping, to limit the impact of mirids in plots. We develop and study a piece-wise smooth delayed dynamical system. Based on pr...
Article
1.Images are resourceful data for ecologists and can provide a more complete information than other methods to study biodiversity and the interactions between species. Automated image analysis however often relies on extensive datasets, not implementable by small research teams. We are here proposing an object detection method that allows the analy...
Chapter
Full-text available
Régulation des bioagresseurs des cultures dans les systèmes agroforestiers tropicaux, revue des approches bagny beiLhe L., aLLinne c., aveLino J., babin r., brévauLt t., gidoin c., ngo bieng m.a., motisi n., soti v. et ten hooPen g.m. Résumé. Au sein des systèmes agroforestiers tropicaux, de nombreuses interactions se déroulent dans et entre les en...
Article
Full-text available
We examined the recruitment rate of nestmates during prey capture in six arboreal ant species: Myrmicaria opaciventris, Platythyrea conradti, Crematogaster sp., Crematogaster clariventris, Tetramorium aculeatum, and Oecophylla longinoda. Termites and grasshoppers were used as prey. Prey were grouped by size: for termites, we presented ants with eit...
Article
Full-text available
The brown cocoa mirid, Sahlbergella singularis (Hemiptera: Miridae), causes cocoa yield loss of about 30 % to 70 % in Cameroon. The pathogenicity of six indigenous isolates of Beauveria bassiana (BIITAC) and Metarhizium anisopliae (MIITAC) to the fourth and fifth nymphal stages of S. singularis was evaluated under laboratory conditions. Two methods...
Article
Cocoa mirid, Sahlbergella singularis, is one of the major pests of cocoa in West Africa. It is responsible of several damages in plots. In this paper, we study the dynamics of this pest. Based on biological and ecological partial knowledge, we develop 2 cooperative mathematical models that aim to describe the time dynamics of the cocoa mirids. We f...
Article
The use of ants for biological control of insect pests was the first reported case of conservation biological control. Direct and indirect community interactions between ants and pests lead to differential spatial pattern. We investigated spatial interactions between mirids, the major cocoa pest in West Africa and numerically dominant ant species,...
Article
Mirids, Sahlbergella singularis, are the most harmful cacao pest in Africa. Chemical management, although controversial, is currently the only effective option for controlling these pests. Based on in vitro and field experiments, this study evaluated and compared the effectiveness of aqueous extracts obtained from the seeds of Thevetia peruviana (T...
Conference Paper
CIRAD, CATIE, PROMECAFE, CABI, BIOVERSITY Intl, ICRAF e INCAE crearon en 2007 el PCP. El fin del PCP es unir esfuerzos en la búsqueda de recursos para: desarrollar investigaciones y enseñanza (pre y posgrado) sobre agroforestería, incrementar la capacidad de cada institución para desarrollar proyectos agroforestales, y favorecer la comunicación ent...
Article
Full-text available
Combining crop plants with other plant species in agro-ecosystems is one way to enhance ecological pest and disease regulation mechanisms. Resource availability and microclimatic variation mechanisms affect processes related to pest and pathogen life cycles. These mechanisms are supported both by empirical research and by epidemiological models, ye...
Article
Full-text available
The effect of integrating vector larval intervention on malaria transmission is unknown when insecticide-treated bed-net (ITN) coverage is very high, and the optimal indicator for intervention evaluation needs to be determined when transmission is low. A post hoc assignment of intervention-control cluster design was used to assess the added effect...
Article
Two invasive, container-breeding mosquito species, Aedes aegypti (Stegomyia aegypti) and Aedes albopictus (Stegomyia albopicta) (Diptera: Culicidae), have different distribution patterns on Reunion Island. Aedes albopictus occurs in all areas and Ae. aegypti colonizes only some restricted areas already occupied by Ae. albopictus. This study investi...
Conference Paper
Full-text available
Manipulating ant communities to control pests of cocoa has proven to be a promising strategy, especially in Asia. However, concerning African cocoa mirids, the main pests of cocoa in Africa, basic knowledge on mirid-ant relationships is still incomplete. Our study aimed to characterize the spatial relationships between dominant ant species and the...
Conference Paper
Full-text available
Worldwide, crop monocultures have proven to be particularly susceptible to pests and diseases. In Africa, unshaded "pure" cocoa plantations are often highly damaged by mirids and consequently require intensive phytosanitary protection. The aim of this study was to assess the impact of an alternative agronomic practice, a cocoa-fruit intercropping s...
Article
The invasive Asian tiger mosquito, Aedes albopictus, has been established on the French overseas island of Mayotte in the Indian Ocean since 2007. Despite the presence of a resident population of Aedes aegypti, Ae. albopictus has expanded its presence in urban areas, in contrast to the pattern of invasion by this mosquito elsewhere in the world. We...
Article
Full-text available
The effective measures for the control of malaria and filariasis vectors can be achieved by targeting immature stages of anopheline and culicine mosquitoes in productive habitat. To design this strategy, the mechanisms (like biotic interactions with conspecifc and heterospecific larvae) regulating mosquito aquatic stages survivorship, development t...
Article
Aedes albopictus and Aedes aegypti are the two main worldwide arbovirus vectors that have experienced invasion phases. Aedes aegypti is a pantropical species that spread centuries ago whereas Ae. albopictus started the main wave of invasion in the 1980s. Both species have been at various times on the different islands in Southwestern Indian Ocean (...
Article
Mayotte is a small island in the South West Indian Ocean where the tropical climate is particularly favorable to vector-borne diseases. The presence of various mosquito, vectors of arboviruses is a significant health risk for the population. This article attempts to assess the the consequences of a changing thermal regime on populations of Aedes mo...
Article
In Reunion Island, the distribution of the domestic form of Aedes aegypti (L.) has been restricted to natural habitats, in ravines located on the driest west coast over the past 50 yr. It is mainly found in rock holes, where it principally co-occurs with Aedes albopictus (Skuse), the most common Aedes species and the major vector of arboviruses the...
Article
This is the first description of Ae. albopictus in Grande Glorieuse and Juan de Nova, which are two isolated French islands of the Mozambique Channel. The recent introduction of this species is underlined by its absence in the inventories realised between 2000 and 2003. The last severe arbovirus epidemic of chikungunya (2005-2006), vectored by Ae....
Article
Full-text available
The Asian tiger mosquito, Aedes albopictus (Skuse, 1894), is an invasive species that can be found on all continents. The species, originally considered a secondary vector of viruses such as Dengue viruses, has recently been suggested to play a role in the transmission of Chikungunya virus in several countries bordering the Indian Ocean, Central Af...
Article
Biological invasions generally induce profound effects on the structure of resident communities. In Mayotte, where Aedes aegypti and Ae. lilii were already present, the recent introduction of Ae. albopictus raises public health concerns because it may affect the risk of arbovirus transmission. Entomological surveys were carried out in six locations...
Article
Full-text available
First record of Aedes albopictus, vector of arboviruses in the Eparse Islands of the Mozam-bique channel and updating of the inventory of Culicidae. This is the first description of Ae. albopictus in Grande Glorieuse and Juan de Nova, which are two isolated French islands of the Mozambique Channel. The recent introduction of this species is underli...
Article
Full-text available
A two step quantitative RT-PCR assay was validated to monitor the deformed wing virus (DWV) RNA loads in Apis mellifera L. and Varroa destructor. A pair of primers hybridising in a conserved domain of the putative DWV RNA polymerase gene region was designed. These primers amplified a 69-nucleotide fragment which was quantified using the SYBR-green...

Projects

Project (1)
Project
This is a common project with Paul Tresson (PhD student, CNRS LIRMM-CIRAD), William Puech (CNRS LIRMM) and Philippe Tixier (GECO, CIRAD). It is finaced by the CIRAD and #Digitag (https://www.hdigitag.fr/en/). In the context of sustainable development in agriculture, it is crucial to define integrated pest management methods. Among these, pest regulation by natural enemies represents a promising way. However, to date, there is no method (i) to identify with certitude the generalist predators that are involved in the biocontrol of pests and (ii) to quantify the effect of this biocontrol on the population dynamics of the pests (i.e. the effectiveness of biocontrol in the field). These knowledges are crucial for the development and the transfer of effective agroecological management practices. We propose the use of in natura mesocosms coupled with a non-perturbing video measurement method of interaction networks to quantify regulation and predation. These mesocosms will correspond to existing banana production situations in Martinique, the study area of ​​the GECO unit, and will cover a large range of plant biodiversity (planned or not). In each of these mesocosms, the population dynamics of the banana weevil Cosmopolites sordidus will be followed by capture-mark-recapture method in order to determine the magnitude of the regulation by the natural enemies that occurs. In each selected situation, we will establish a control corresponding to a plot where natural enemies are excluded. The video method will allow to know the identity of the predators involved in the regulations and to quantify the links of trophic and non-trophic interactions existing in the animal community (frequency, duration and type of interactions). To this end, methods of automated digital image analysis will be developed (e.g. automatic recognition of a pest, count of individuals), including machine learning and in particular convolutional neural network methods that are developed by the ICAR team (LIRMM unit). These methods should revolutionize our understanding of the functioning of agrosystems and, because of their genericity, can be applied to the study of most cultivated systems.