A phytotoxic composition comprising as an active ingredient a compound of the formula shown in Figure 1 of the accompanying drawings, wherein R1 and R2 are alkyl of alkoxy having from 1 to 10 carbon atoms, R3 is halogen, alkyl or alkoxy having from 1 to 10 carbon atoms, n is an integer from 0 to 3, A is oxygen or sulfur, X is chlorine, bromine or iodine, and Z,Z1 and Z2 are hydrogen, alkyl, alkoxy,alkenyl or alkynyl having from 1 to 18 carbon atoms, aryl having from 6 to 24 carbon atoms, heterocyclyl having a miximum of 24 carbon atoms and from 1 to 3 hetero atoms, or two of Z groups are combined to form a bivalent alkylene radical having from 1 to 6 carbon atoms in admixture with an adjuvant such as herein described, the active ingredient in the said composition being present in an amount of at least 0.1 per cent by weight.