Inhibitory effect of essential oils from medicinal plants on post-harvest fungal diseases of citrus fruit
Shabnam Farzad, Majid Azizi, Behrouz Jafarpour, Mahrokh F. Rastegar and Vahid Jahanbakhsh
Abstracts of 27th International Horticultural Congress & Exhibition (IHC 2006), August 13-19, 2006, COEX (Convention & Exhibition), Seoul, Korea. 494 pages.
2006
บทคัดย่อ
Inhibitory effect of essential oils from medicinal plants on post-harvest fungal diseases of citrus fruit
The consequence of misuse of chemical biocides in controlling pest and disease has drawn the attention of policy makers to promote the development of natural compounds to prevent decay and insect attack. one of the new and safe methods of controlling pest and disease is use of essential oils from medicinal plants. In the present investigation, inhibition of radial growth and spore germination of important post-harvest fungi (Penicillium italicum, Penicillium digitatum and Alternaria citri) exposed to different concentrations essential oils from some medicinal plants (Thymus vulgaris, Mentha piperita, Satureja hortensis, Cuminum cyminum and Trachyspermum copticum) were studied. Essential oils were applied at 250, 500 and 1000 ppm and compared to control (without any treatments). Radial growth of P. italicum was completely inhibited by Th. vulgaris(500 ppm), S. hortensis and T. copticum(1000 ppm). Radial growth of P. italicum exposed to C. cyminum and M. piperita essential oils (1000ppm)decreased (57.17% and 36.8% respectively). Radial growth of P. digitatum was completely inhibited by Th. vulgaris, T. copticum(500ppm)and S. hortensis(1000ppm). Radial growth of P. digitatum exposed to essential oils of C. cyminumand M. piperita decreased 22.8% and 12.15%, respectively. A. citriradial growth was completely inhibited by Th. vulgaris(250ppm). T. copticum and S. hortensis (500ppm), C. cyminum(1000 ppm). M. piperita essential oils (1000ppm) decreased radial growth of A. citri by 59.44%. Therefore the increasing inhibitory effect of essential oils on post-harvest diseases of citrus fruit was Th. vulgaris> T. copticum> S. hortensis> C. cyminum> M. piperita and the extent of inhibition of fungal growth was dependent on concentration of essential oils used.