The effect of garlic essential oil plants, Mancozeb and Metalaxyl-Mancozeb on damping-off diseases caused by Phytophthoraspp.

Document Type : Complete paper

Authors

1 Department of Plant Protection, College of Agriculture, University of Kurdistan, P. O. Box 416, Sanandaj, Iran

2 Department of Horticulture, Agriculture Faculty, University of Kurdistan, Sanandaj, Iran

3 Assistant Professor Dep Horticulture, Agricultural faculty, University of Kurdistan

Abstract

This study was carried out to evaluate the antifungal efficacy of garlic essential oil (Allium sativum L.) and two fungicides including Metalaxyl- Mancozeb and Mancozeb against Phytophthora melonis, P. drechsleri and P. capsici the causal agent of damping- off on Pepper, Melon and Cucumber, in vitro and greenhouse conditions. Fungal radial growth for each concentration of garlic oil on Phytophthora species was measured. The Median Effective Concentration (EC50) values (ppm) of garlic oil measured. The chemical composition of the essential oils was determined by gas chromatography-mass spectrometry (GC-MS). Results of in vitro studies indicated that plant extract of garlic caused a significant decrease in the mycelial growth of phytophthora species and it had Fungistatic properties. The inhibitory effect of plant essential oil was observed for P. capsici (EC50 = 43.293 ppm) and P. drechsleri (EC50 = 50.236 ppm), respectively. The profile of the extract components of Allium sativum showed that Diallyl tetra sulphide (31.32%), Allyl disulphide (26.78%), Nitrosothymol (8.64%), 1H-1,2,4-Triazole, 3-thiol-5-methyl (8.4%) and Allyl sulphide (6.15%) were the main compounds. The results of greenhouse showed that plant essential oil significantly reduced disease compared to control (P ≤ 0.05). Based on results from this research, the garlic essential oil was found to be fungistatic effect against damping –off diseae and may be used in the production of organically grown vegetables.

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References

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BIOLOGICAL CONTROL OF PESTS AND PLANT DISEASES
Volume 4, Issue 1 - Serial Number 1
Spring & Summer
April 2015
Pages 47-56

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