Bioactivity of Aqueous Extracts from some Parts of Mesquite (Prosopis juliflora) and Fungicide (Amistar Top®) on Growth of Fusarium oxysporum f. sp. tuberosiUnderLaboratory Conditions

Abstract

Increasing hazards to public health and environment due to indiscriminate use of synthetic pesticides coupled with development of resistant strains of phytopathogenic fungi has initiated the exploration of safe alternate product. A good number of reports outlined the antimicrobial effects of some plants extracts for plant disease control. This study was conducted at the Plant Pathology Laboratory, Collage of Agricultural Studies, Sudan University of Science and Technology, January 2019; to investigate, under laboratory conditions, the bioactivity of aqueous extracts of some parts of mesquite plant namely, leaves and fruits, plus Fungicide Amistar top® against the growth of Fusariumoxysporum f. sp. tuberosiwilt fungus of potato. Three concentrations(25%, 50% and 100%) of each of the two extracts of mesquite tree parts and 100 % concentrationof fungicide Amistar Top® in addition to control were used in this study. The results showed that all extracts had a significant inhibitory effect on the growth of the fungus. Among the two extracts, the mesquite leaves extract, especially the high concentration,was more effective than fruits extract in inhibiting of fungusgrowth, which give higher inhibition in all concentration (64.3% 80% and 96.6%)while the fruits. When comparing all the treatments, it was found that the extracts of the leaves and fruits of the Mesquite in addition to Amistar top® fungicide were exhibited superior inhibitory on the growth of the fungus by 65%, 96.6% and 100% respectively compared to control. The results also showed that effectiveness of the extract was directly proportional to its concentration. The results obtained from this study are promising and encouraging carrying out further chemical analyzes of various parts of the Mesquite tree using different extracts to identify the effective ingredient in each of theseparts to use it as alternatives to harmful pesticides that adversely affect human, animal and environment