Antifungal efficiency of plants aqueous extracts with potential for control of Cercospora oryzae Miyake in rice,

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Résumé

Rice (Oryza spp.) is the third most cultivated cereal crop in Benin, and major staple in the population’s
daily diets. Its production, though is heavily impaired by fungal diseases, of which cercosporios
accounts for about 60% yield loss. The objective of this study was to examine the efficacy of plant
aqueous extracts for control of Cercospora oryzae diseases for improved rice production in Benin.
We assessed the in vitro effectiveness of plant extracts on the sporulation and mycelial growth of C.
oryzae, by evaluating the effectiveness of extracts on the foliar and panicular incidence, as well as the
epidemic of C. oryzae in the field. Arandomised complete block design arranged in split plots, was laid
out with three spraying replications. The study combined phytiatric tools. Extracts from Lippia
multiflora, Azadirachta indica and Eucalyptus camaldulensis at concentrations of 10 and 15% showed
antifungal efficacy on Cercospora oryzae in vitro and in the field. Extracts of Cymbopogon citratus
and Citrus limon did not exhibit antifungal efficacy against Cercospora oryzae.

Mots-clés

Azadirachta indica, Cercospora oryzae, phytiatric tools