Title: Study on the efficacy of Thifluzamide 24% SC fungicide on controlling of rice sheath blight disease in Northern Iran
Author: Maryam Khoshkdaman
Abstract;. Sheath blight disease of rice caused by Rhizoctonia solani AG-1 IA, has been recognized as an economically significant disease. No resistant cultivar has been reported so far and management of rice ShB has been mainly leaning on chemical fungicide applications. In order to prevent resistance to fungicides in pathogenic fungal strains, introducing new fungicides with different effect points and belongs to different groups is essential for integrated disease management. Thus, in 1989, the efficacy of the fungicide Tiflozamide (Thifluzamide 24% SC) was tested on rice sheath blight disease control in the north of Iran. A research project was implemented in the laboratory and field of the rice research institute of Rasht and the field of Amol rice research institute. Field experiments were designed with a randomized complete block design in three replications, and 14 treatments. Experiments in the laboratory were designed in the randomized complete design. In the field experiments, six treatments were spraying in one step, 24 hours after plant infestation with the casual agent. Another six treatments were spraying in two steps, 24 hours and 15 days after plant infestation with the casual agent. Eventually, the efficacy of treatments on relative lesion height (RLH), incidence, and grain yield was surveyed. Data were subjected to the analysis of variance (SAS, 2003). Means among the treatments were compared based on Tukey’s test at the 0.05 probability level. The results showed that double spraying with Thifluzamide 24% SC fungicide (300 ml/ha dosage) with 15 days apart was suitable for Guilan province and in order to prevent the possibility of resistance, Nativo fungicide is suggested as an alternative or intermittent use of Thifluzamide fungicide. In Mazandaran province, one spraying step with Thifluzamide fungicide (300 ml/ha dosage) is recommended. In order to prevent resistance to fungicide and better productivity of Tilt fungicide than nativo in this province, Thifluzamide can be used in alternation with Tilt.
Keywords: Rice, Thifluzamide fungicide, Leaf-sheath blight, Disease management