Provided is an agrochemical composition for foliage treatment, which does not cause phytotoxicity to a cultivated crop due to adhesion thereto when foliage treatment of an upland field is performed with pyroxasulfone, but has a high level of safety and an herbicidal effect on a broad spectrum of weeds. The agrochemical composition for foliage treatment comprises pyroxasulfone and a masking material that masks the pyroxasulfone, wherein the pyroxasulfone is microencapsulated in or coated with the masking material such that phytotoxicity to a cultivated crop due to adhesion thereto when foliage spraying is performed is avoided.本發明係提供一種莖葉處理用農藥組成物，其係以碸吡草唑(Pyroxasulfone)將農田進行莖葉處理時，不會引起對栽培作物之附著藥害，安全性高、且具有廣大範圍除草效力之莖葉處理用農藥組成物。其係包含碸吡草唑、與隱蔽碸吡草唑之隱蔽物質的莖葉處理用農藥組成物，其特徵為前述隱蔽物質於莖葉散布時，以對栽培作物不引起附著藥害的方式，來微膠囊化或被覆碸吡草唑。
