• K.HANE GRAFF
• T. SUTHIN RAJ

Rhizoctoniasolaniis the causative agent of rice sheath blight, which has become a major problem in rice production. Seaweeds provide a rich source of structurally diverse and biologically active secondary metabolite and is proved to be better to decrease the foliar fungal diseases which ultimately increase its fertility and help the growth of plants. The use of natural products becomes the ultimate way of combating this disease. In this context, five different seaweeds such as Sargassumwightii, Dictyotabartyrensiana, Ulva reticulate, Gelidiellaacerosaand Odonusnigerwere used along with the fish powder extract in control of sheath blight disease in rice were studied. Evaluation of marine products against R. Solaniwas carried out by Spore germination assay, Paper disc assayand Agar well method. Among the five marine extracts tested, extracts of Sargassumwightii[brown seaweed algae] at a high concentration (20%) was found to be the best the in the reduction of spore germination (19.60 %). The leaf extracts of Sargassumwightii[brown seaweed algae] at highest concentration of (20%) showed a maximum reduction in both paper disc method and agar well method with 44.65 and 45.90 per cent zone of inhibition respectively. In the present study it revealed that the efficacy of seaweed extracts and against fungal pathogens is may be due to higher levels and early accumulation of phenolics and phytoalexins and the pot study proved that the R. solani can be controlled by the application of brown seaweed.

Seaweeds, Rhizoctoniasolani, Antifungal Compounds, Rice

"ANTIFUNGAL ACTIVITY OF MARINE PRODUCTS AGAINST RHIZOCTONIA SOLANI UNDER IN VITRO CONDITION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 9, page no.82-86, September-2018, Available :http://www.jetir.org/papers/JETIRA006245.pdf

"ANTIFUNGAL ACTIVITY OF MARINE PRODUCTS AGAINST RHIZOCTONIA SOLANI UNDER IN VITRO CONDITION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 9, page no. pp82-86, September-2018, Available at : http://www.jetir.org/papers/JETIRA006245.pdf