The study of the efficacy of some herbal essences and chitosan in controlling Rhizoctionia solani, rice sheath blight fungus disease

The use of natural compounds for disease control and prevention has been considered because of the benefits. Using herbal essences has been developed due to having medicinal properties, antifungal, antibacterial and antioxidant secondary metabolites in the control of pathogens. In this study, the performance of three plant essential oils Cumin (Cuminum cyminum), cinnamon (Cinnamomum zeylanicum) and peppermint (Mentha sp.) and soluble chitosan in the prevention and treatment of rice sheath blight caused by the fungus Rhizoctionia solani in vitro and in Ziveh, were studied. This experiment was done in a completely randomized design with 500 treatments and 3 replications. Treatments consisted of three factors essential oils, each in five different concentrations (100, 200, 400, 600, 800, 1000 ppm) and the Factor chitosan in two concentrations 800 and 1000 milligram per liter and also two control included a positive control (culture medium along with tilt PDA) and negative control (dextrose agar medium potatoes without oil). Each treatment consists of three replicates each also includes three petri dish (for all treatments and positive and negative controls), respectively. Inhibition of different concentrations was determined using the Abbott formula. The full minimum inhibitory concentration of essential oils (MIC) and minimum fungicidal concentration of essential oils (MFC) was also calculated. The factorial experiment was considered in a completely randomized design with three replications in which every essence as a factor and different concentrations of essential oils, different levels of each factor. The results showed that essential oils of cinnamon and cumin inhibited 100% of the growth of R. solani were in effect concentrations ppm 200. The essential oil and chitosan 100% inhibition at concentrations of 600 and 1000 were one of their own. In addition to these three extracts of cinnamon, cumin and mint with a percentage of inhibition, respectively, 67/81, 50/82 and 33/83 showed similar results, with 50% inhibition chitosan least inhibition of pathogenic fungi on plant show.