@article{Adeniji_Taiga_Ayodele_2019, title={Comparative Studies on the Susceptibility of Three Tubers of Dioscorea Species to Dry Rot in Anyigba, Kogi State}, volume={8}, url={https://journals.aijr.org/index.php/ias/article/view/1904}, DOI={10.21467/ias.8.1.70-74}, abstractNote={<p>Various yam species are cultivated but white yam (<em>Dioscorea rotundata </em>Poir.), water yam (<em>Dioscorea alata L.</em>) and yellow yam (<em>Dioscorea cayenensis </em>Lam.) are among the most cultivated in Nigeria. The Susceptibility of three tubers of <em>Dioscorea</em> species (<em>D. rotundata, D. alata</em> and <em>D. cayenensis</em>) to dry rot pathogens was investigated. Isolation was made from rotted tuber tissues, followed by pathogenicity test and identification of isolates; two fungal species <em>Aspergillus niger</em> and <em>Rhizopus</em> <em>stolonifer </em>were isolated and identified as the major fungi causing yam tuber dry rot in the study area. There was significant difference (P<0.05) in the susceptibility of the various <em>Dioscorea</em> tuber species studied to rot caused by <em>Aspergillus niger</em> [<em>D. rotundata </em>(20mm), <em>D. alata</em> (11mm) and <em>D. cayenensis</em> (3.5mm)] and  <em>Rhizopus  stolonifer</em> [ <em>D. rotundata </em>(17.5mm), <em>D. alata</em> (10mm) and <em>D. cayenensis</em> (2mm)]. The phytochemical contents of the three tubers of <em>Dioscorea</em> species examined also varied significantly, with the bioactive substances of <em>D. cayenensis</em> and <em>D. alata</em> relatively higher when compared to <em>D. rotundata</em>. Therefore, this research reveals that three metabolites; Saponin, Flavonoid and Tanin constitute the major trait for resistant ability of <em>D. cayanesis</em> and D<em>. alata</em> to dry rot causing pathogen.  Therefore, it is necessary that the differences in susceptibility be considered when developing yam barns. Also, researchers should work on genetically improving the susceptible white yam (<em>D. rotundata) </em>which is commonly eaten by millions of Nigerians with a possibility of increasing the quantities of the deficient phytochemicals.</p>}, number={1}, journal={International Annals of Science}, author={Adeniji, Adegboyega and Taiga, Apovughaye and Ayodele, M S}, year={2019}, month={Oct.}, pages={70–74} }