The invention provides the weedicide that has superior weeding activity and useful crop etc. is presented the Oxopyrazine derivative of high security or its salt and contains it.The present invention relates to the Oxopyrazine derivative shown in the following general formula [I] or its salt, and the weedicide that contains these compounds. In the formula, X 1Expression Sauerstoffatom or sulphur atom X 2Expression CH or N (O) mM represents 0 or 1 integer R 1Expression hydrogen atom, C 1~C 12Alkyl etc. R 2Expression halogen atom, cyano group etc. R 3Expression hydroxyl, halogen atom etc. A 1Expression C (R 4R 5) A 2Expression C (R 6R 7) or C=O A 3Expression C (R 8R 9) R 4To R 9Expression hydrogen atom or alkyl.
