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Abstract

Disclosed is a method of improving the growth of plants wherein at least one compound of formula (I) 1 wherein A is 2-chloropyrid-5-yl, 2-methylpyrid-5-yl, 1-oxido-3-pyridinio, 2-chloro-1-oxido-5-pyridinio, 2,3-dichloro-1-oxido-5-pyridinio, tetrahydrofuran-3-yl, 5-methyl-tetrahydrofuran-3-yl or 2-chlorothiazol-5-yl group, R is hydrogen, C.sub.1-C.sub.6alkyl, phenyl-C.sub.1-C.sub.4alkyl, C.sub.3-C.sub.6cycloalkyl, C.sub.2-C.sub.6alkenyl or C.sub.2-C.sub.6alkynyl; Y is --N(R)(R.sub.2) or SR.sub.2; R.sub.1 and R.sub.2 are independently of each other C.sub.1-C.sub.4-alkyl, C.sub.1-C.sub.4-alkenyl, C.sub.1-C.sub.4-alkinyl --C(.dbd.O)--CH.sub.3 or benzyl; or together form a group --CH.sub.2--CH.sub.2--, --CH.sub.2--CH.sub.2--CH.sub.2--, --CH.sub.2--O--CH.sub.2--, --CH.sub.2--S--CH.sub.2--, --CH.sub.2--NH--CH.sub.2-- or --CH.sub.2--N(CH.sub.3)--CH.sub.2--; and X is N--NO.sub.2 or N--CN or CH--NO.sub.2; or, where appropriate, a tautomer thereof, in each case in free from or in salt form; is applied to the plant or the locus thereof.

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First Claim