Antifungal Effects of Carica Papaya and Azadirachta indica on Cocoyam (Colocassia esculentus L.) corm rot Disease in Umudike, Nigeria
Antifungal potency of two crude extracts (A. indica and C. papaya) was studied using four concentrations of aqueous and ethanoic plant extracts at 25, 50, 75 and 100% on cocoyam corms. The extracts were separately amended in potato Dextrose agar (PDA) in in-vitro control of fungal rot causing agents isolated from cocoyam corms (Botryodiplodia, Aspergillus niger, Trichoderma and Rhizopus stolonifer). Infected cocoyam corms were collected from cocoyam program of National Root Crop Research Institute, Umudike and taken to Plant protection laboratory of the Institute for analysis. Botryodiplodia, A. niger, Trichoderma and R. Stolonifer proved to be pathogenic from the pathogenicity test carried out since they all incited rots in cocoyam corms. The results further revealed that all the test botanicals were able to significantly (P<0.05) inhibit the mycelia growth of all the four test fungi. A. indica was consistently observed to be more potent to all the four test fungi and followed closely were ethanoic extracts of C. papaya (42.33-61.00%). The findings have shown the potential of plants extracts in the control of cocoyam corm rot caused by B. theobromae, A. niger, Trichoderma sp. and R. stolonifer. These botanicals A.indica and C.papaya will therefore, reduce the use of synthetic chemicals by farmers in controlling pathogens of stored cocoyam corms, cost of production and environmental pollution.
NAJ supports free online communication and exchange of knowledge as the most effective way of ensuring that the fruits of research and development practice are made widely available. It is therefore committed to open access, which, for authors, enables the widest possible dissemination of their findings and, for readers, increases their ability to discover pertinent information. The Journal adopts and uses the CC: BY license and is open access. This license lets others distribute, remix, adapt, and build upon your work, even commercially, as long as they credit you for the original creation. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the Journal’s published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work. Copyright for articles published in this Journal is retained by the Journal.