GREENHOUSE SCREENING OF CORN GLUTEN MEAL AS A NATURAL CONTROL PRODUCTFOR BROADLEAF AND GRASS WEEDS

Corn (Zea mays L.) gluten meal (CGM) was evaluated under greenhouse co nditions for efficacy on 22 selected monocotyledonous and dicotyledono us weed species, Corn gluten meal was applied at 0, 324, 649, and 973 g . m(-2) and as a soil-surface preemergence (PRE) and preplant-incorp orated (PPI) weed control product, CGM reduced plant survival, shoot l ength, and root development of all tested species, Black nightshade (S olanum nigrum L.), common lambsquarters (Chenopodium album L.), creepi ng bentgrass (Agrostis palustris Huds.), curly dock (Rumex crispus L.) , purslane (Portulaca oleracea L.), and redroot pigweed (Amaranthus re troflexus L.) were the most susceptible species. Plant survival and ro ot development for these species were reduced by greater than or equal to 75%, and shoot length was decreased by >50% when treated PRE and P PI with 324 g CGM/m(2), Catchweed bedstraw (Galium aparine L.), dandel ion (Taraxacum officinale Weber), giant foxtail (Setaria faberi Herrm. ), acid smooth crabgrass [Digitaria ischaemum (Schreb,) Schreb, ex Muh l] exhibited survival and shoot length reductions >50% and an 80% redu ction in root development when treated with PPICGM at 324 g . m(-2). B arnyardgrass [Echinochloa crus-galli (L.) Beauv.] and velvetleaf (Abut ilon theophrasti Medic.) were the least susceptible species showing su rvival reductions less than or equal to 31% when treated with 324 g CG M/m(2),