Abstract: Compounds of the formula ##STR1## are described in which R.sub.1 represents a perfluoroalkyl radical of from 1 to 2 carbon atoms, and at least one of R.sub.2 and R.sub.3 represents hydrogen, and the other, or both represent lower alkyl, and R.sub.4 represents a lower alkyl radical which may be unsubstituted or bear certain substitution, and which are useful as herbicides in a method for controlling weeds and wild grasses. Compositions containing such compounds are also described. Finally, novel fluoro-thio semicarbazides are described which are useful intermediates in the production of the compounds of Formula I.

Abstract: Thiophosphorylguanidines as hereinafter defined in formula are effective for combating pests, such as insects, Acarina, microorganisms, and preferably phytopathogenic nematodes. The new compounds act systemically.

Abstract: New derivatives of 1,3,4-thiadiazolyl-(2)-hexahydrotriazinon of formula ##STR1## wherein R.sub.1 and R.sub.2 are independently of each other C.sub.1 -C.sub.4 alkyl or together with the nitrogen atom to which they are linked a pyrrolidino, piperidino or morpholino ring andR.sub.3 is an alkyl, alkenyl, alkinyl, alkoxyalkyl or alkylthioalkyl or the benzyl radical are disclosed and a process for the manufacture thereof. These compounds are herbicides and may be used for selective weed control in culture crops especially soya.

Abstract: Methanesulphonic acid-2-bromoethyl ester has been found to possess nematocidal properties. It may be used in the form of suitable compositions.

Abstract: Agent for the regulation of plant growth, which agent contains as active substance at least one acylamine of the formula ##SPC1##Wherein R.sub.1 represents hydrogen, methyl or ethyl, R.sub.2 represents hydrogen, methyl, ethyl, n-propyl, isopropyl, methoxyethyl, allyloxymethyl or lower alkyloxymethyl, and n denotes the number 3 or 4.