Abstract :
[en] Gabon is a Central African country rich in diversity of plant and animal species. Vegetable production increases every year, this development causes the proliferation of pests and pathogens. In 2012, study was conducted in three market garden perimeters in Libreville and Owendo to ensure a sustainable pest control. Records of yellow traps and weekly visual observations were made in plots of pigweed (Amaranthus sp. Amaranthaceae), of red sorrel (Hibiscus sabdariffa L, Malavaceae), of tomatoes (Lycopersicon esculentum Mill, Solanaceae) and of cabbage (Brassica oleracea L., Brassicaceae). A total of 7119 insects were counted and taxonomically classified into 8 separate orders including 81 families. The main pests were represented by 4 families: Aphididae (31.0%), Cecidomyiidae (5.1%), Chrysomelidae (4.0%), Thripidae (2.0%) and 6 families of useful insects (pollinators and predators): Dolichopodidae (5.4%), Andrenidae (2.6%), Coccinellidae (1.7%), Syrphidae (0.6%), Braconidae (0.5%), Hemerobiidae (0.1%). Entomological diversity is discussed according to the local conditions.
