Abstract

Rice curvulariosis caused by Curvularia lunata is an emerging disease in Burkina Faso. This study evaluated the efficiency of three contact fungicides on the developmental stages of this pathogen in vitro. The experimental design used was a split-plot. The main factor included fungicides with three modalities, and the secondary factor was the doses of fungicides with four levels, including the untreated control, which was repeated four times. The fungal material consisted of the Curvularia lunata (BM) strain. The fungicides used were Copper Hydroxide, Mancozeb and Chlorothalonil. The results showed a very good efficiency of Mancozeb (PI=100%) and Copper Hydroxide (PI>90%) on mycelial growth, sporulation and germination of conidia of Curvularia lunata while Chlorothalonil obtained a medium efficiency on mycelial growth (PI=64.2%), a very low efficiency on sporulation (PI=33.25%) and a good efficiency on conidial germination (PI=79.31%). These results are relevant and require a complementary study to evaluate the effectiveness of these fungicides on the manifestations of curvulariosis on the plant in order to design an effective control method.

Key words: Fungicides, curvulariosis, Curvularia lunata, rice, in vitro, efficency.