Biphenyl substituted spirocyclic ketoenol derivatives (I), are new. Biphenyl substituted spirocyclic ketoenol derivatives of formula (I), are new. X : halo, (halo)alkyl or (halo)alkoxy Z : optionally substituted fluorophenyl W 1>, Y 1>H, halo, (halo)alkyl or (halo)alkoxy CKE : pyrrolone derivative of formula (a) or furone derivative of formula (b) CAB 1>optionally saturated cyclic compound (optionally substituted and containing at least a heteroatom) G : H, E or a group of formula (-CO-R 1>), (-C(=L)-M-R 2>), (-SO 2-R 3>), (-P(=L)(R 4>)(R 5>)) or (-C(=L)-N(R 6>)(R 7>)) E : metal ion or ammonium ion L, M : O or S R 1>alkyl, alkenyl, alkoxyalkyl, alkylthioalkyl, polyalkoxyalkyl (all optionally substituted with halo), cycloalkyl (interrupted through at least a heteroatom and optionally substituted with halo, alkyl or alkoxy), phenyl, phenylalkyl, hetaryl, phenoxyalkyl or hetaryloxyalkyl R 2>alkyl, alkenyl, alkoxyalkyl, polyalkoxyalkyl (all optionally substituted with halo), cycloalkyl, phenyl or benzyl (all optionally substituted) R 3>-R 5>alkyl, alkoxy, alkylamino, dialkylamino, alkylthio, alkenylthio, cycloalkylthio (all optionally substituted with halo) or phenyl, benzyl, phenoxy or phenylthio (all optionally substituted) and either R 6>, R 7>alkyl, cycloalkyl, alkenyl, alkoxy, alkoxyalkyl (all optionally substituted with halo), phenyl or benzyl (both optionally substituted) or H or NR 6>R 7>a ring optionally interrupted by O or S. Independent claims are included for: (1) the preparation of (I) (2) an agent comprising active substance combination of (I) and at least a compound, which improves the compatibility of culture plant, e.g. 4-dichloroacetyl-1-oxa-4-aza-spiro[4.5]-decane, 1-dichloroacetyl-hexahydro-3,3,8a-trimethylpyrrolo[1,2-a]-pyrimidin-6(2H)-one, 4-dichloroacetyl-3,4-dihydro-3-methyl-2H-1,4-benzoxazine, 5-chloro-quinolin-8-oxy-acetic acid-(1-methyl-hexylester), 3-(2-chloro-benzyl)-1-(1-methyl-1-phenyl-ethyl)-urea, 2,4-dichloro-phenoxy acetic acid, piperid
