Antifungal Effects of Senescence Terminalia Cattappa Leaves Extract on Disease Pathogens Associated With the Infestation of Hypsipyla robusta on Khaya grandifoliola

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Abstract The causal organisms responsible for leaf blight and twig dieback on the saplings of Khaya grandifoliola infested with Hypsipyla robusta were investigated. Isolation of pathogens and subculturing of isolates from infested K. grndifoliola tissues were carried out using Potato Dextrose Agar (PDA). The inhibitory effects of T. cattapa leaves on the mycelial growth of identified pathogens were carried at different concentration of grounded T. cattapa leaves (0.0g 2g, 4g, 8g, and 10g) per litre of standard PDA medium in five replicates using CRD. One way ANOVA was carried out on data obtained from the radial measurements of mycelia growths on each pathogen (α = 0.05), and mean separations was done using LSD. Identified isolates from leaf blight were Rhizoctonia sp. and Colletotrichum sp. The isolates from the twig dieback were Fusarium sp. Fusarium sp radial mycelial varied significantly (P < 0.05) among the control, 4.0g/l, 6.0g/l, while there was no significant difference (p > 0.05) between the control and 10.0g/l. The highest percentage inhibition for Fusarium sp. was observed on 4.0g/l. Also, radial mycelial growth of Rhizoctonia sp varied significantly (P < 0.05) between 4.0g/l and other concentration levels while maintaining the highest percentage (7.17%) inhibition. Therefore, it was concluded that pathogens responsible for leaf blight and twig dieback of Khaya grandifoliolia trees following the infestation of Hypsipyla robusta were Rhizoctonia sp and Fusarium sp, respectively. The study also revealed that T. cattapa senescence leaves liquid extracts has the potency of controlling the pathogens.

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