Defoliating insect inventory for nursery and plantation success in the GGW

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Gauthier, Nathalie | Jourdan, Herve | Diop, Amsata | Touré, Mamour | Sall, Saïdou Nourou | Bal, Amadou Bocar

Edité par CCSD ; FAO -

International audience. The GGW restoration is based on active reforestation operations using local forest species that are adapted to the climatic and physical conditions of the Sahelian environment and can be used by local people. These species are subject to numerous biotic attacks, particularly insects in both the nurseries where the young plants are produced and in reforested plots where they are planted. A study combining field ecology in the Ferlo, a sylvo-pastoral zone of the GMV in north-eastern Senegal, and a molecular Barcoding approach set out to determine the specific diversity and richness of the community of insects causing damage to 3 acacia species, Senegalia senegal, Vachellia nilotica and V. tortilis subsp raddiana. Based on sampling carried out in 2022 and 2023, 39 caterpillar species belonging to 8 families have been identified, with 5 species accounting for 57% of specimens. Only 22 of these are found in nurseries, among which is I. pulinda subsp deerraria (Geometridae), a species never described locally, but responsible for serious leaf damage on V. nilotica.

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