Detail of "22212-55-1"

Reference

The effects of herbicides, applied alone and in sequence, on the control of wild-oats (Avena fatua) and broad-leaved weeds, and on yield of winter wheat

The effects of herbicides, applied alone and in sequence, on the control of wild-oats (Avena fatua) and broad-leaved weeds, and on yield of winter wheat. Wilson, B. J.; Cussans, G. W. (Weed Res. Organ., Agric. Res. Counc., Yarnton/Oxford, Engl.). Ann. Appl. Biol., 89(3), 459-66 (English) 1978. CODEN: AABIAV. ISSN: 0003-4746. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemicals) The effects of controlling wild oats and autumn-germinating broadleaf weeds in winter wheat, early in winter or late in spring were studied. The herbicides used were barban [101-27-9] (winter), chlortoluron [15545-48-9], or isoproturon [34123-59-6] (winter), and benzoylprop-ethyl [22212-55-1], at the recommended doses and at half doses. Sequential treatments of two herbicides at half doses were also examd. All treatments were given a routine broadleaf herbicide treatment in spring. Yields of wheat were influenced more by the time of weed removal than by the degree of control achieved. Grain yields at 3 sites with dense autumn broadleaf weed populations were greatest following the use of chlortoluron or isoproturon. At 3 other sites with moderate to dense wild oat populations (60 to 240 plants/m2), the use of barban at the crop three-leaf stage gave larger yields than benzoylprop-Et in late spring at the early stem elongation stage of the crop. Seed formation from surviving A. fatua was similar with both wild-oat herbicides. The treatment which reduced seed prodn. of A. fatua and maintained crop yield most consistently was barban followed by benzoylprop-Et, each at half the normal recommended dose.

Hydrolysis of the herbicide benzoylprop ethyl by wild oat esterase

Hydrolysis of the herbicide benzoylprop ethyl by wild oat esterase. Hill, B. D.; Stobbe, E. H.; Jones, B. L. (Dep. Plant Sci., Univ. Manitoba, Winnipeg, Manitoba, Can.). Weed Res., 18(3), 149-54 (English) 1978. CODEN: WEREAT. ISSN: 0043-1737. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemicals) Section cross-reference(s): 7 A carboxylesterase [9016-18-6] from wild oat (Avena fatua), which hydrolyzes benzoylprop Et [22212-55-1] to the herbicidally active benzoylprop acid [22212-56-2]; was partially purified by (NH4)2SO4 fractionation and Sepadex G-100 gel filtration. An 8.3-fold purifn. was obtained with 46% recovery. The rate of deesterification of benzoylprop Et-14C was 0.1 nmol/16 h at std. assay conditions of 1 mg lyophilized enzyme prepn. in 0.1 mL phosphate buffer (0.1 M, pH 7.0), substrate 5 mM. The wild oat esterase was stable, and the activity was a function of reaction time; enzyme and substrate concn. was characterized. Incubation with a-chymotrypsin reduced wild oat esterase activity as did the presence of EtOH in reaction mixts. Esterase activity for benzoylprop Et-14C was not detected in prepns. from wheat (Triticum aestivum). Evidence was obtained which suggested the presence of an inhibitor in wheat.