Etude de l’effet antifongique des extraits végétaux sur l’agent de la pourriture des inflorescences de palmier dattier

Abstract

The aim of our study is to use plant extracts as bio fungicides on Mauginiella scaettae causal agent of the date palm inflorescences rot . The antifungal activity of these extracts is tested by the micro- dilution method in a solid environment in order to calculate the antifungal index. The extraction method allowed us to obtain a return, the highest of which is that of Pomegranate peelers (1.66%) followed by Lantana camara (0.065%) then the lowest castor (0.043). The results of the antifungal activity show that the methanolic extracts of the three plants have a biological control potential of M. scaettae. The effectiveness of each methanolic extract is tested for different concentrations (5%, 10%, 20%, 50%, 100%) and estimated by the growth inhibition rate of the fungus. For the extract of Ricinus communis, the best inhibition rates are observed for the concentrations of 50% and 100% with respective values of 72% and 82% inhibition the Lantana camara extract has a strong inhibitory effect ( 75%) for the 100% concentration. Pomegranate peeler extract has good inhibitory effects at 50% and 10% concentrations with inhibition rates of 72% and 82% respectively. The result with which we concluded in this work is that extracts of Punica granatum show a good fungistatic effect against M.scaettae fungi compared to the two extracts Lantana camara and Ricinus communis.