The present invention relates to a new isoxazole derivative represented by the formula (I).
Said isoxazole derivative which causes no phytotoxicity on useful crops such as corn, cotton, wheat and barley but can selectively simultaneously control gramineous weeds and broad-leaved weeds as a single herbicide at a low dosage, and a herbicide containing the above isoxazole derivative as an active ingredient.
Pyrazole derivatives of the general formula (I) or salts thereof,
wherein each symbols are as defined in the specification,
herbicides containing the above compounds as active ingredients, and aromatic carboxylic acid derivatives or salts thereof suitable as intermediates for the production of the above pyrazole derivatives.
The above pyrazole derivatives or salts thereof, provided by the present invention, cause no phytotoxicity on upland field crops such as corn, etc., and can selectively control a broad range of upland weeds such as grass weeds and broad-leaved weeds at a low dosage in pre-emergence treatment and in post-emergence treatment.