Clofop-isobutyl

A compound closely related to diclofop-methyl is clofop-isobutyl, isobutyl 2-[4-(4-chlorophenoxy)phenoxy] propionate (26), introduced under the code number Hoe 22 870 (Alopex ) (Schwerdtie et al., 1975). 

Both herbicides are translocating compounds used for the control of annual grassy weeds, and both can be combined with dicotyledon weedkillers with the exception of hormone-type herbicides. Diclofop-methyl is recommended for preemergence but mainly for postemergence use, clofop-isobutyl for preemergence use, both at rates of 0.3 1.2 kg active ingredient/ha. 

On investigating the causes of the selectivity of dichlofop-methyl and clofop-isobutyl and the metabolism of the herbicides, it has been established that selectivity is due to the different rates of metabolism in sensitive and tolerant plants, to the different nature of the metabolites formed and to the fact that both the unchanged active substances and their derivatives demethylated in the plants by the metabolic pathway (clofop and diclofop) act at different sites in Avena spp. and cereals (Shimabukuro et al.. 1978 Gorecka et al., 1978). 

J. V.- U1 Cllll Tokuthion (prothiofos) Torak (dialifor) Toxaphene Zardex (cycloprate) Alachlor Alanap (naptalam) Alopex (clofop-isobutyl) Amex 820 (butralin) Amiben (chloramben)... 

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