Identification of best spray schedules for Propiconazole fungicide against spot blotch disease in Wheat
Journal of Bioscience and Agriculture Research
Spot blotch disease caused by Bipolaris sorokiniana (Sacc.) shoem. is one of the most destructive diseases of wheat (Triticum aestivum L.) in plain areas of Nepal. Triazoles fungicides are expensive but effective against the disease. The experiment was conducted to identify the most efficient spray schedules of Tilt (Propiconazole 25 ec) fungicide against spot blotch disease in wheat. The experiment was carried out at National Wheat Research Program, Bhairahawa, Nepal in Randomized Complete
... omized Complete Block Design with three replications and 12 treatments. The treatments comprised of frequencies of spray, days for spray after the seeding date and intervals between two sprays. Both two and three sprays of Propiconazole fungicide remarkably reduced the severity of spot blotch disease, but single spray hadn't any effect on spot blotch disease. Two sprays at 70 and 85 days after seeding (DAS) were the most effective among the tested treatments against spot blotch disease. The spray of fungicide at early crop stage (before 50 DAS) and very late crop stage (after 80 DAS) had less effect on spot blotch disease AUDPC. There weren't significant differences in spot blotch AUDPC between the spray schedules having 10 and 15 days intervals. Grain yield and Thousand Grain Weight (TGW) were significantly higher in some treatments having tilt spray as compare to the control. The single spray had no impact on yield increments; however, two and three sprays significantly increased the grain yield. Cost effective assay of Propiconazole against spot blotch disease shows that one, two and three sprays of fungicide are beneficial for both seed and grain production purposes under Nepalese conditions. In conclusion, spray of Propiconazole fungicide at appropriate time periods manages the spot blotch disease, increases the yield and is cost effective in both seed and grain production schemes for the farmers of Nepal.