Efficacy of Bio-Fungicide at Varying Concentrations against Rice Blast (Magnaporthe grisea)

Abstract

Various researches have already reported the efficacy of bio-fungicides against rice blast (Magnaporthe grisea). However, studies on the optimum concentration that will inhibit the growth of the fungus were not yet conducted. This study aimed to determine the optimum concentration of bio-fungicide formulated by the Free Farmers Federation against rice blast (Magnaporthe grisea). It was undertaken using paper disc method and slide germination technique laid out in Completely Randomized Design (CRD). Results showed that among the concentrations of bio-fungicide (bf), 0.009 ppm was proven to be more effective than the other treatments with 19.5 mm average zone of inhibition on the mycelial growth of M. grisea that is 5%, 12%, 15%, and 100% higher than 0.005 ppm bf, 0.007 ppm bf, 0.00375 ppm Dithane, and negative control, respectively. Highest percentage kill is also exhibited by the same treatment at a rate of 53.8% as shown in the results on slide germination technique. Therefore, 0.009 ppm bio-fungicide can be the optimum concentration of bio-fungicide to control rice blast.