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Curvularia lunata was isolated from leaf spot of rice var. Sen Pidoa and tested for pathogenicity. Chaetomium cupreum CC3003 expressed antifungal activity against C. lunata in dual culture test. Hexane-crude extract, EtOAc-crude extract and methanol-crude extract from C. cupreum inhibited sporulation of C. lunata with ED50 of 6.41, 0.83 and 7.81 μg/mL, respectively. Pot experiment revealed that plant heights in treated with a spore suspension of C. cupreum , bioformulation of C. cupreum , nano product from C. cupreum and tebuconazole were not significantly different when compared to the inoculated control. Disease reduction compared to the inoculated control from treatment with a spore suspension of Chaetomium, bioformulation of C. cupreum , nano product from C. cupreum and tebuconazole ranged between 41.66% to 58.33%. Field experiment indicated that chemical method was decreased leaf spots infection by 60%, followed by organic method (40%) and GAP methods (40%) , respectively. The chemical and GAP methods were significantly higher in grain weight than the organic method when compared to the non-treated control. This is the first report using C. cupreum to control leaf spot of rice var. Sen Pidoa caused by C. lunata in Cambodia.

Bioformulations and Nano Product from Chaetomium Cupreum CC3003 to Control Leaf Spot of Rice var. Sen Pidoa in Cambodia