Effect of Some Essential Oils against Rhizoctonia solani and Streptomycetes scabies on Potato Plants in Field Conditions
Annual Research & Review in Biology
Keywords: antimicrobial activity, essential oil, potato, Rhizoctonia solani, Streptomycetes scabies Aim: In this study, six essential oils (Cuminum cyminumum, Anethum graveolens, Salvia officinalis, Origanum onites, Rosmarinus officinalis and Lavandula intermedia) were tested in control of Rhizoctonia solani and Streptomycetes scabies on potato plants. Material and Methods: Essential oil solutions of each species were sprayed uniformly (10 ml for each plant) to aerial parts of potato plants
... f potato plants with a manually operated sprayer, when potato plants have reached 15-20 cm height. Controls were sprayed with DMSO (0.5%) and Tween 20 (0.1 %) solutions. Essential oil treatments were repeated 15 days intervals for three times. Plant harvest was made at November. Infection of Rhizoctonia solani and Streptomyces scabies were determined of harvested tubers of each plots. Results: Diesease severity of R. solani was observed 4-4.2% for the sage oils respectively. Origanum onites and Anethum graveolens reduced diseases severity of S. scabies, whereas lavander had a lowest effect against S. scabies. Disease development was also controlled in the field with the essential oil of sage reducing infection of potato tubers significantly. However, the effectiveness of these essential oils with both the tested pathogens showed different responses. Conclusion: This study suggests that essential oils have potential as antimicrobial preservatives for the control of Rhizoctonia solani and Streptomycetes scabies on potato plants in filed conditions.