Vol. 51â1997 - NorthEastern Weed Science Society
Vol. 51â1997 - NorthEastern Weed Science Society Vol. 51â1997 - NorthEastern Weed Science Society
110 POSTEMERGENCEWEEDCONTROLIN SOYBEANS WITH CGA-277476 R. L. Ritter and H. Menbere* ABSTRACT CG -277476 (proposed common name - oxasulfuron) is the active ngredient in a new sulfonylurea herbicide being developed by CIBA Its proposed trade name is Expert. CGA-277476 was evaluat d in Maryland in 1995 and 1996 for postemergence control of broa leaf weeds in soybeans ([Glycine max. (L.) Merr.]. Posteme gence rates tested ranged from 0.059 to 0.07 Ib ai/A. All app ications were made in combination with a nonionic surf act nt at 0.25% vivo phytotoxicity was observed with CGA-277476 at all Yet, soybeans seemed to outgrow these symptoms after application. d control of burcucumber (SicYQs angulatus L.), common cockleb r (Xanthium strumarium L.), common ragweed (Ambrosia a t m's" 0 i L.), and giant ragweed (Ambrosia trifida L.) was obtaine with CGA-277476. Poor control of common lambsquarters ( 'album L.) was observed. The addition of CGA-2488757 (propos d trade name - Action), acifluorfen (Blazer), or thifen lfuron-methyl (Pinnacle) aided CGA-277476 in the control of co n lambsquarters. also observed that when combined with clethodim reduction in giant foxtail (Setaria faberi Herrm.) observed. *Assoc Prof. and Agric. Res. Tech., Agric. Exp. Stn., Agron. Dept., Univ. of MD, College Park, MD 20742.
111 SUPPRESSI N OF A CROWNVETCHIBIRDSFOOT TREFOIL LIVING MULCH FOR NO-TILLAGE CORN PRODUCTION N. L. Hartwig and W. S. Curran! ABSTRACT Most of herbicides presently labeled for use on field com were applied preplant (PP) andlor post to a 0 e year old stand of crownvetch (Coronilla varia L.) and birdsfoot trefoil CL2tY.s comiculatus L.) t at was seeded in com in 1995. Preplant treatments were applied on May 17, 1996 when the cr wnvetch was 4 to 8" and birdsfoot trefoil 8 to 10" in height. On May 31 the whole trial area treated with metolachlor (Dual II) +pendimethalin (Prowl) @ 1 + 0.825#aiIA to control most ual weeds without affecting crownvetch or birdsfoot trefoil growth. Since imazethapyr (Pur uit) was one of the treatments, an imidazolinone resistant com (~~L) variety was plant . Post treatments were applied June 17, 1996 when crownvetch was 8 to 10 inches and birdsf t trefoil 8 to 12 inches tall and com in the 4 to 5 leaf stage. The soil as a Hublersburg Silt Loam (Typic Hapludult) with a pH of 6.8. All treatments were applied wi a tractor mounted small plot sprayer with 800 15 extended range flat fan nozzles at 28 psi in 20 g A of water. 'Asgrow RX623T' com was planted in 10 by 25 ft. plots with a four row no-till panter in 30 in. rows on May 22, 1996 with 100 Ib/A of 10-30-10 fertilizer in the row. Liquid nitr en @ 120 Ib N/A was applied as a sidedress treatment on May 31. Annual broadleaf weed c ntrol was virtually 100% for all treatments and annual grass control was 95% or better. There wa some horsenettle (Solanum carolinense L.), hemp dogbane (Apocynum cannabinum L.) d goldenrod (Solidago spp.) scattered through the trial area. a solid stand of birdsfoot trefoil by mid May with a sparse stand of crownveteh mixed with it. e highest com yield was 135 but A where birdsfoot trefoil suppression was 95% and the crown vet h was completely killed. Previous research would suggest that crownvetch suppressed 95% r more for the first 6 weeks after com planting will seldom compete with com and the stunted c wnvetch canopy may indeed save more moisture that it uses. Twenty 0 the 36 herbicide treatments were glyphosate or growth hormone type herbicides applied preplant t the com after the crownvetch had 4 to 8 inches and birdsfoot trefoil 8 to 10 inches of new gr . This herbicides almost totally killed the one year old crownvetch but did suppress the bird foot trefoil about 95% which is probably the right amount. Recovery growth of the birdsfoot tref il was between 250 and 800 lblA of biomass by September and generally anything less th 500 Ib/A of biomass will not cause a significant loss in com yield. Glyphosate was used at 0.75 b/A preplant as a bumdown treatment followed by various growth hormone and sulfonylureas w ch provided some additional birdsfoot trefoil suppression. Well established crownvetch will so tolerate these treatments but a one year old stand is too sensitive. The best over crop suppression was obtained with contact herbicides such as paraquat, glufosinate or cy azine for bumdown in combination with or followed by other herbicides such as atrazine, alae or, metolachlor, acetochlor, dimethanamid, pendimethalin, flumetsulam or flumiclorac for idual weed control and to slow the rate of cover crop recovery. Atrazine at rates 0.5 to 0.751b/A i necessary to slow the rate of birds foot trefoil recovery. Without atrazine in the mixture the birds oot trefoil recovers so fast that it suppresses com yields excessively. Crownvetch is n t suppressed quite as much as birdsfoot trefoil by these treatments but the ultimate goal is t have the crownvetch take over and then manage just the crownvetch as a perennial living ulch. 1 Prof. and Asso . Prof. of Weed Sci., Dept. of Agronomy, Pennsylvania State University, University Park, PA. 16802.
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110<br />
POSTEMERGENCEWEEDCONTROLIN SOYBEANS<br />
WITH CGA-277476<br />
R. L. Ritter and H. Menbere*<br />
ABSTRACT<br />
CG -277476 (proposed common name - oxasulfuron) is the<br />
active ngredient in a new sulfonylurea herbicide being developed<br />
by CIBA Its proposed trade name is Expert. CGA-277476 was<br />
evaluat d in Maryland in 1995 and 1996 for postemergence control<br />
of broa leaf weeds in soybeans ([Glycine max. (L.) Merr.].<br />
Posteme gence rates tested ranged from 0.059 to 0.07 Ib ai/A.<br />
All app ications were made in combination with a nonionic<br />
surf act nt at 0.25% vivo<br />
phytotoxicity was observed with CGA-277476 at all<br />
Yet, soybeans seemed to outgrow these symptoms<br />
after application.<br />
d control of burcucumber (SicYQs angulatus L.), common<br />
cockleb r (Xanthium strumarium L.), common ragweed (Ambrosia<br />
a t m's" 0 i L.), and giant ragweed (Ambrosia trifida L.) was<br />
obtaine with CGA-277476. Poor control of common lambsquarters<br />
( 'album L.) was observed. The addition of CGA-2488757<br />
(propos d trade name - Action), acifluorfen (Blazer), or<br />
thifen lfuron-methyl (Pinnacle) aided CGA-277476 in the control<br />
of co n lambsquarters.<br />
also observed that when combined with clethodim<br />
reduction in giant foxtail (Setaria faberi Herrm.)<br />
observed.<br />
*Assoc Prof. and Agric. Res. Tech., Agric. Exp. Stn., Agron.<br />
Dept., Univ. of MD, College Park, MD 20742.
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