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Communication Dans Un Congrès Année : 2016

Impact of weeds management on the floristic composition and abundance of the cover in citrus orchards: a step to conservation biological control

Résumé

Citrus orchards in Reunion Island are intensively sprayed with pesticides and herbicides. We hypothesized that pluriannual alternative ground cover management to herbicide use could influence the floristic abundance and composition of the cover. We aim to understand vegetal community behavior after perturbations to go towards a natural pest control favourable ground cover . Aerial plant parts samplings were taken every three months during two years for different pluriannual weed management: herbicide, mowing, hammer mill, Cover crop. Vegetal species are sorted and their dried weights were measured after 48h at 80°C. Statistical analyses were computed with R software using Kruskal-Wallis test. The averaged biomass was significantly reduced for the herbicide modality in comparison to the other modalities. The floristic compositions of the vegetal community (fig.2 on the left) and species relative biomasses were different depending on the modality: example for Desmanthus virgatus that shows a high estimated potential for conservation biological control due to its extrafloral nectar that draws many natural enemies Ground cover management in a pluriannual experiment impacts the plant community component of the ground cover in orchards. These results reveal that producers can directly act on the type of vegetation. Parallel studies are in process to assess plant functional diversity following ground cover perturbations and its impacts on natural ennemies to foster conservation biological control. The perspective is to determine the most appropriate mangement and its frequency of implementation that lead to an establishment of habitats for natural enemies.
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Dates et versions

hal-03252208 , version 1 (07-06-2021)

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  • HAL Id : hal-03252208 , version 1

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Marie Rothé, Fabrice Le Bellec, Rosemy Payet, Christian Bockstaller. Impact of weeds management on the floristic composition and abundance of the cover in citrus orchards: a step to conservation biological control. ESA14 - Growing landscapes – Cultivating innovative agricultural systems, Sep 2016, Edinburgh, United Kingdom. pp.8.21-8.22. ⟨hal-03252208⟩
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