| 摘要 |
Herbicidal compsns. contain sulphonylurea derivs. of formula (I) or their salts in combination with one or more other herbicides (II). (a) R1 = 2-3C alkoxy, R2 = halogen, NO2, CF3 etc., (b) R1 = opt. unsatd. 1-8C alkoxy (substd. by halogen, opt. unsatd. 1-6C alkoxy, 1-6C alkylthio, 1-6C alkylsulphinyl etc., R2 = opt. unsatd. 1-8C alkyl, phenyl, phenoxy etc. and n = 0-3 or (c) R1 = 1-8C alkoxy, R2 = 2-8C alkenyl, 2-8C alkynyl, phenyl etc., (d) R1 = halogen, OMe, Et or Pr, R2 = 2-5C alkoxycarbonyl in the 6 position and n = 1, R3 = H, opt. unsatd. 1-8C alkyl or 1-4C alkoxy, R4, R5 = H, halogen or 1-4C alkyl, alkoxy etc. Y = O or S, E = CH or N. (II) are selected from quinchlorac (B1) or its salts, molinate (B2), thiobencarb (B3), butachlor (B4), pretilachlor (B5), dithiopyr (B6), mefenacet (B7), fenoxaprop ethyl (B8), dimepiperate (B9), pyrazolynate (B10), pyrazoxyfen (B11), benzofenap (B12), naproanilid (B13), bensulfuron methyl (B14) etc. Combinations of (I) with a single cpd. (II) selected from B1-B9, B14-B16 and B28 are excluded. (I) are described in DE3933543, B1-B27 are described in 'The Pesticide Manual' (1991), B28 in EP238070, B29 in 'Weed Research' (1989), B30 in 'Weed Research' (1990, B31 in EP332133 and B32 in J-6 0087254 (sic). Also claimed is the use of cpds. (II) for protecting crop plants from the phytotoxic side effects of herbicides. USE/ADVANTAGE - The compsns. are useful for pre- and post-emergence control of mono- and dicot weeds, esp. for selective control of monocot weeds in rice and maize crops. Combinations of (I) and (II) have synergistically enhanced herbicidal activity and in some cases (B19 and B32) synergistically reduced phytotoxicity to rice.
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