Mitsui Toatsu Chemicals, Incorporated

Takeshi Sekino

Hitoshi Shimotori

Yuji Yanase

Katsutoshi Ishikawa

Toshiaki Kuwatsuka

Hideo Kawashima

Yoshiro Kanemoto

Naofumi Tomura

Junya Fujiwara

Noboru Iida

Hiroharu Tanikawa

Application of a rice blast control agent containing an isothiazolecarboxylic acid derivative of the below-described formula, which shows excellent activity against rice blast (Pyricularia oryzae) in rice cultivation, to the water surface of a paddy rice field results in the absorption of the derivative through roots of rice plants, so that the resistance of the rice plants can be enhanced. ##STR1## wherein R.sup.1 and R.sup.2 independently mean a hydrogen or halogen atom or a particular group, and Y stands for an OR.sub.3 group (R.sup.3 being a hydrogen or alkali metal atom or a particular group), an NHR.sup.4 group (R.sup.4 being a hydrogen atom or a particular group), or a morpholino group.

Isothiazolecarboxylic acid derivatives, rice blast control agents

Disclosed are dihalogenothiocyanopyrimidine derivatives of the general formula ##STR1## wherein X and Y are halogen atoms, a process for preparing such derivatives, as well as agricultural and horticultural fungicidal compositions containing such a derivative as active ingredient.

Dihalogen-substituted thiocyanopyrimidine derivatives, and agricultural

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Mobara, Japan

Takeshi Sekino