Treatment of sunflower(s) with pyrazolium salt - to lessen their height and so reduce damage by wind etc. (BR 25.8.81)

The stems of sunflowers are dwarfed and stiffened by application, to the plants or the soil in which they are seeded, of a pyrazolium salt of formula (I) or (II) (where R1 and R2 are 1-3C alkyl, or phenyl; R4 is H, OH, 1-18C alkyl, 1-3C haloalkyl, 1-4C alkoxy, 2-4C alkenyl, haloalkenyl or alkynyl, benzyl, cyclohexylmethyl, COOCH3, -CH2COOC2H5, -OP(O)(OC2H5), halo, nitro, or where R7 and R8 is H, halogen or NO2; R3 and R5 is 1-12C alkyl, 1-6C alkoxy, 3-6C cycloalkyl, 3-6C cycloalkylthio, halo, NH2, (CH3)2N-, C6H5NH-, C6H5O-, C6H5S-, U,V and W is H, halogen, 1-4C alkyl, 1-3C alkoxy, CN,NO2.CF3,CH3S-, CH3SO2-, CH3CONH- CH3OOC,C6H5 or C6H5O-; R6 is (H)n or (CH3)n; n is 0 or 1, m is 1,2 or 3; X is acetate, sulphate, hydroxide, hydrogen sulphate, methylsulphate, benzene sulphonate, 1-4C alkyl benzene sulphonate, 1-4C alkoxy benzene sulphonate, nitrate, phosphate, hydrogen phosphate, dihydrogen phosphate, carbonate, 1-12C alkane sulphonate, bromide, chloride or iodide. L'INVENTION A POUR OBJET UN PROCEDE DE NANISATION ETOU DE RAIDISSEMENT DE LA TIGE DES TOURNESOLS CONSISTANT A APPLIQUER SUR LES PLANTES OU SUR LE SOL DANS LEQUEL LES GRAINES DES PLANTES SONT SEMEES CERTAINS SELS DE PYRAZOLIUM, DE PYRAZOLINIUM ET DE PYRAZOLIDINIUM SUBSTITUES, EN DES PROPORTIONS SUFFISANTES POUR OBTENIR LE DEGRE SOUHAITE DE NANISATION ETOU DE RACCOURCISSEMENT DES TIGES.