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KMID : 0903519880310030226
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1988 Volume.31 No. 3 p.226 ~ p.233
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Development Feasibility of Water - Floating Fungicide Formulation for the Control of Sheath Blight(Caused by Rhizotonia solani) in Rice
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Abstract
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Some physico-chemical properties and biological activities of new fungicide formulations were tested to investigate a feasibility of water-floating formulation development for sheath blight control in rice. Pencycuron[1-(4-chlorobenzyl)-1-cyclopenty-3-phenylurea] and flutolanil(α, α ,α-trifluoro-3´-isopropoxy-O-toluanilide) were chosen as toxicants for the formulations. Vegetable oil and surface active agents were used as a floating agent and spreader, respectively.
All the formulations tested showed an excellent spreadability on the water having over 35㎠/㎎ and were chemically stable, which the degradation rates of active ingredients mere less than 10% after 12 weeks of storage at 50℃. Most of the applied test formulation of pencycuron was retained within 0.5㎝ of the surface paddy water, while that of flutolanil was vertically dispersed in the water. Inhibition activity of the tested pencycuron formulation on the sclerotia germination of the pathogen in paddy water w-as maintained over 30 days after the formulation treatment. Control effect of 4% pencycuron. water-floating formulated with surface active agent of hydro-lipophyllic balance 4.3 on the disease in rice was equal to the reference fungicide(pencycuron 25% WP) when the former was treated one day before the transplantation of rice seedlings. Overflowing the submerged paddy water after the formulation treatment resulted in a deterious effect on the disease control.
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