INHIBITORY ACTIVITY OF CORN GLUTEN HYDROLYSATE ON MONOCOTYLEDONOUS AND DICOTYLEDONOUS SPECIES

Corn gluten hydrolysate (CGH) was evaluated in the greenhouse for its herbicidal activity on 19 selected monocotyledonous and dicotyledonous species. Treatments included CGH at 0, 1, 2, 4, and 8 g.dm(-2). Plant susceptibility was based on plant survival, shoot length, and root le ngth. The germination and growth of all species were inhibited by the application of CGH at all rates. Black medic (Medicago lupulina L.), b uckhorn plaintain (Plantago lanceolata L.), creeping bentgrass (Agrost is palustris Huds.), purslane (Portulaca oleracea L.), and redroot pig weed (Amaranthus retroflexus L.) were the most susceptible species, ex hibiting more than 70% reduction in root length, 60% reduction in plan t survival and 52% reduction in shoot length with CGH at 1 g.dm(-2). C ommon lambsquarters (Chenopadium album L.), curly dock (Rumex crispus L.), dandelion (Taraxacum officinale Weber), giant foxtail (Setaria fa beri Herrm.), large crabgrass [Digitaria sanguinalis (L.) Scop.], and yellow foxtail [Setaria lutescens (Weigel) Hubb.] exhibited more than 50% reduction in root length and plant survival at 1 g.dm(-2). Annual bluegrass (Pea annua L.), barnyardgrass [Echinochloa crusgali (L.) Bea uv.], green foxtail [Setaria viridis (L.) Beauv.], orchardgrass (Dacty lis glomerata L.), perennial ryegrass (Lolium perenne L.), quackgrass [Agropyron repens (L.) Beauv.], and velvetleaf (Abutilon theophrasti M edic.) survivial was reduced by 60% at 2 g.dm(-2). Annual ryegrass (Lo lium multiflorum Lam.) was the least susceptible species.