Title: Study on the efficacy of Picarbutrazox 10% SC fungicide in controlling of rice foot rot
Author: Hadis Shahbazi
Abstract: Rice foot rot disease caused by Fusarium fujikuroi is one of the most important rice seed-borne diseases worldwide. The best way to control this disease is seed disinfection. In this study, the efficacy of the new fungicide, Picarbutrazox 10% SC in controlling rice foot rot disease in comparison with Trifmine (Triflumizole 15% EC) was evaluated in the laboratory and field (in the nursery) in four replications. The results showed that there was no relationship between increasing the concentration of Picarbutrazox and increasing or decreasing inhibition of mycelial growth. While the concentration of 1 ppm active ingredient of Trifmine inhibited mycelial growth by about 62.96%. In the wet culture test, at concentrations of 1500, 1750, and 2000 μl/l of Picarborrazox observed the lowest germination percentage and the highest percentage of infected seedlings with Fusarium rot, which were not statistically significantly different from the infected control. In the sterilized soil test, no relationship was observed between the increasing concentration of Picarbutrazox and seedling mortality percentage. In the nursery, the density of seedlings at all three concentrations of 0.5, 1, and 1.5/1000 of Picarbutrazox was significantly lower than the natural control and higher than the infected control, and with increasing the concentration of this fungicide, the seedling density noticeably decreased. Although different concentrations of Picarbutrazox caused a significant decrease in the percentage of seedlings with spotted roots compared to the infected control, these percentages were significantly higher than the natural control and Trifmine treatments. In this research, none of the concentrations of Picarbutrazox had acceptable efficacy in the studied indices.
Keywords: Seedling death, seed-borne disease, Fusarium rot, seed disinfection