By: Byung-Youl Oh and Jin-Hwa Kim
Some physiCO-chemical propert}es and biological activities of new fungicide formujations
were tested to investigate a feasibility of water-floating formulation development for sheath
blight control in rice. Pencycuron[l--(4-chlorobenzyi)--1-c.yclopentyl-3-phenylurea/ and
flutolanil(a, a, cr-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
35cmz/mg and were cbemically stabie, which the degradation rates of active ingredients
were less than lOo/L after 12 weeks of storage at sooc. Most of the app!ied test formuIation
of pencycuron was retained within 0. 5cm of the surface paddy water, while that of flutoi-
anil was vertically dispersed in the \vater. Inhibition activity of the tested pencycuron
formulation on the sclerotia gerniination of the pathogen in paddy water was maintained
over 30 dayo after the formulation treatment. Control effect of 40/
pencycuron.water-fjoat-
ing formulated with surface active agent of hydro-lipophyllic balance 4.3 0n the Liisease in
rice was equal to the reference fungicide(pencycuron 2570WP) when the formor \x"as trea-.ed
one day before the transplantation of rice seedjings. Overflowing the submerged paddy xxatPr
after the formulation treatment resulted in a deterious effect on the disease contrul.
Some physiCO-chemical propert}es and biological activities of new fungicide formujations
were tested to investigate a feasibility of water-floating formulation development for sheath
blight control in rice. Pencycuron[l--(4-chlorobenzyi)--1-c.yclopentyl-3-phenylurea/ and
flutolanil(a, a, cr-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
35cmz/mg and were cbemically stabie, which the degradation rates of active ingredients
were less than lOo/L after 12 weeks of storage at sooc. Most of the app!ied test formuIation
of pencycuron was retained within 0. 5cm of the surface paddy water, while that of flutoi-
anil was vertically dispersed in the \vater. Inhibition activity of the tested pencycuron
formulation on the sclerotia gerniination of the pathogen in paddy water was maintained
over 30 dayo after the formulation treatment. Control effect of 40/
pencycuron.water-fjoat-ing formulated with surface active agent of hydro-lipophyllic balance 4.3 0n the Liisease in
rice was equal to the reference fungicide(pencycuron 2570WP) when the formor \x"as trea-.ed
one day before the transplantation of rice seedjings. Overflowing the submerged paddy xxatPr
after the formulation treatment resulted in a deterious effect on the disease contrul.
Yangzhou pioneer chemical CO.,LTD
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