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Antifungal Potential of Some Plant Extracts Against Colletotrichum gloeosporioides Causal Organism of Papaya Anthracnose Disease

2019; Science International; Volume: 12; Issue: 3 Linguagem: Inglês

10.3923/ajbs.2019.589.595

1996-3351

Maha Laksha Mudiyansel, Villani Sepala Dah, Chithrani Ranasinghe,

Banana Cultivation and Research

Background and Objective: The chemical control of papaya anthracnose used by Colletotrichum gloeosporioides is a crucial problem.Plant extracts are emerging as safer alternatives to conventional fungicides for the control of plant diseases.The present investigation was conducted with the objectives of evaluating six different plant extracts for their antifungal activity against C. gloeosporioides.Materials and Methods: Plant species, Cassia fistula, Lantana camara, Moringa oleifera, Ocimum tenuiflorum, Ricinus communis and Solanum torvum were screened for inhibition of mycelium growth and conidia formation.The C. gloeosporioides spore suspension of 1×10 5 spores mLG 1 was sprayed evenly on treated papaya fruits with each plant extract and control fruits were sprayed with sterile distilled water.Diseases severity, soluble solids content, pH and fruit mass loss were evaluated.Results: Methanol extract of L. camara of 100 µL from the concentration of 50 mg mLG 1 resulted in the highest inhibition of mycelia growth and conidia formation (90.71:70.85%)followed by O. tenuiflorum (45.71%) and M. oleifera (44.76%) against C. gloeosporioides.Out of tested extracts, L. camara gave the lowest disease severity index at 20% concentration and maintained optimum quality of papaya fruit during 7 days experimental period.Conclusion: The study revealed that L. camara exhibit strong antifungal activities against C. gloeosporioides and has potential for being formulated into botanical fungicides against anthracnose of papaya.