Abstract: In a process for the preparation of a substituted thiadiazolyloxyacetamide of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is hydrogen, alkyl, alkenyl, alkenyl, alkinyl, optionally substituted cycloalkyl or cycloalkenyl, halogenoalkyl, alkoxyalkyl, alkoxy, aralkyl or optionally substituted aryl, orR.sup.1 and R.sup.2, together with the nitrogen atom to which they are bonded, form an optionally substituted heterocyclic structure which can contain further hetero atoms,One of X and Y is a nitrogen atom and the other a C-R.sup.3 a grouping, andR.sup.

Abstract: 1-Hydroxy-2,2,2-trichloroethane-thionophosphonic acid dialkyl esters of the formula ##STR1## in which R and R.sub.1 each independently is an alkyl radical with 1 to 4 carbon atoms,which possess arthropodicidal properties.

Abstract: A process for the preparation of a dithiophosphoric acid diester-halide of the formula ##STR1## IN WHICH R.sup.1 is alkyl with 1 to 10 carbon atoms, aralkyl with 1 to 6 carbon atoms in the alkyl radical, or alkoxyalkyl or alkylthioalkyl with 1 to 5 carbon atoms in each alkyl radical,R.sup.2 is alkyl with 1 to 8 carbon atoms, andHal is halogen,Which comprises reacting an S-alkyl or S-aralkyl ester of a dithiophosphoric acid dihalide of the formula ##STR2## WITH ABOUT A 5 TO 300% MOLAR EXCESS OF AN ALCOHOL OF THE FORMULAR.sup.2 OHin the presence of about a 5 to 300% molar excess of a tertiary pyridine base or tertiary aralkyl-alkylamine at a temperature between about -10.degree. and +60.degree. C.

Abstract: Plant-growth regulating compositions and methods having strong effects on plant growth, containing an aminomethanephosphonic acid composed of the formula ##STR1## in which R is an NH.sub.2 group or an --NH.sup..sym..sub.3 X.sup..crclbar. radical whereinX.sup..crclbar. is one equivalent of an anion of an organic or inorganic acid, andR' and R", which may be identical or different, are each alkyl of from 1 to 6 carbon atoms, one equivalent of an alkali metal or alkaline earth metal cation, one equivalent of a protonized nitrogen base or of a compound which contains an N.sup..sym. H.sub.3 group, or hydrogen, provided that R' and R" can simultaneously be hydrogen only if R is an --N.sup..sym. H.sub.3 X.sup..crclbar. radical.

Abstract: A process for the preparation of O,O-dimethyl-O-(2,2-dichlorovinyl)-thionophosphoric acid ester of the formula ##STR1## comprising reacting O,O-dimethyl-1-hydroxy-2,2,2-trichloroethane-thionophosphonic acid ester of the formula ##STR2## in isopropanol with a 30-50% aqueous solution of an alkali metal hydroxide, possibly present in a small molar excess.

Abstract: O-Ethyl-S-n-propyl-O-[pyrazolo(1,5a)-pyrimidin(2)-yl]-thionothiolphosphoric acid esters of the formula ##STR1## in which R is hydrogen or halogen,R.sub.1 is alkyl with 1 to 5 carbon atoms or hydrogen,R.sub.2 is hydrogen, halogen or acetyl, andR.sub.3 is hydrogen, alkyl with 1 to 4 carbon atoms or carbalkoxy with 1 to 4 carbon atoms in the alkyl radical,Which possess arthropodicidal and nematicidal properties.