The Efficacy of Mangosteen Peel Crude Extracts for Controlling Rice Dirty Panicle Disease Caused by Curvularia lunata

Abstract

Rice is an economic crop Thailand. Diseases and pests are major problems for rice production, especially rice dirty panicle disease caused by Curvularia lunata by flowering until post harvesting. For disease control many farmers use fungicides cause remaining residues on products and in the environment. For this reason, mangosteen peel crude extracts were used to control plant disease caused by fungi. Potato Dextrose Agar mixed with mangosteen peel crude extracts at concentration 0, 30,000 , 40,000, 50,000, 6 0 ,0 0 0 and 70,000 ppm were tested for controlling rice dirty panicle disease causal agent. The result showed that at 70,000 ppm showed the highest inhibition with average colony diameter of 1.57 centimeter. For sporulation of Curvularia lunata, the concentration of extracts at 70,000, 60,000, 50,000, 40,000 and 3 0 ,0 0 0 ppm were non- significant differences but they were able to inhibit sporulation and growth of Curvularia lunata while increasing of the mangosteen peel crude extracts concentrations.