In-vitro evaluation of fungicide combinations against fruit rot (Colletotrichum truncatum) in chilli

AbstractThe present investigation was carried out in vitro to evaluate effectiveness of combination of two fungicide products in comparison to individual components against fruit rot causing organism, Colletotrichum truncatum (Schwein.) Andrus & W.D. Moore [synonym Colletotrichum capsici (Syd. & P. Syd.) E.J. Butler & Bisby] in chilli crop. The effectiveness of two fungicides, Kresoxim methyl 44.3% SC @ 80, 40, 20, 10, 5 and 2.5 ppm and Tebuconazole 25.9% EC @ 20, 10, 5, 2.5, 1.25 and 0.625 ppm along with untreated control were assessed using food poison technique. Kresoxim methyl 44.3% SC at 80 ppm exhibited significantly low radial growth of the pathogen 0.93, 1.57 and 2.73 cm and resulting in 78.52, 78.78 and 67.88% growth inhibition at 3, 7 and 10 days after exposure, respectively. The lowest radial growth in Tebuconazole 25.9% EC at 20 ppm was 0.32, 0.60 and 0.92 cm with 94.32, 91.67 and 88.82% reduction in radial growth over control at 3, 7 and 10 days after exposure, respectively. The combination effect of Kresoxim methyl 44.3% SC + Tebuconazole 25.9% EC at different levels (40+10, 40+5, 20+10, 20+5, 10+10 and 10+5 ppm), showed that the combination at 40+10 ppm level exhibited minimal radial growth of pathogen 0.45, 0.70 and 1.17 cm with 90.36, 90.54 and 86.12% growth inhibition over control at 3, 7 and 10 days of experimentation, respectively. The present investigation extends opportunities for field evaluation of Kresoxim methyl 44.3% SC + Tebuconazole 25.9% EC as tank mix for the control of fruit rot disease of chilli crop.