Basf Aktiengesellschaft

Wolfgang Tuerk

Hubert Sauter

Johann Jung

Wilhelm Rademacher

Peter Hofmeister

Bernd Wenderoth

Costin Rentzea

Winfried Richarz

Guenter Schulz

Klaus Grossman

An agent for defoliating plants, which contains a 1,3,4-thiadiazol-2-ylurea of the formula I ##STR1## where R.sup.1 is hydrogen or methyl, and

Thiodiazolylurea-containing agent for defoliating plants

Compounds of the formula I ##STR1## where R.sup.1 and R.sup.2 are identical or different and are each hyrogen or alkyl of 1 to 5 carbon atoms, the radicals X are identical or different substituents selected from the group consisting of halogen, cyano, trifluoromethyl, nitro, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, unsubstituted or substituted phenyl or hydrogen, m is from zero to 5, n is an integer from 2 to 6 and Y is --CO-- or --CH(OH)--, their intermediates of the formula (II) ##STR2## and the use of the compounds (I) as plant growth regulators.

1,3-dioxan-5-ylalkyltriazoles, their use for regulating plant growth,

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Ludwigshafen, Germany

Wolfgang Tuerk