| |
| Publication Type:
| Report |
|---|
| Content Type: | Abstract or Summary only |
|---|
| Author(s): | Hayes, R. W.;
Shaw, D. R. |
|---|
| Author Affiliation: | Mississippi State University, MS |
|---|
| Title: | Influence of herbicides and application timing on johnsongrass(Sorghum halepense) control and regrowth |
|---|
| Meeting Info.: | San Antonio, TX: January 14-16, 1991 |
|---|
| Source: | Southern Weed Science Society Proceedings. Vol. 44, 1991, p. 106. |
|---|
| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
|---|
| # of Pages: | 1 |
|---|
| Keywords: | TIC Keywords: Herbicides; Application timing; Sorghum halepense; Regrowth studies; Herbicide application; Imazaquin; Weed control
|
|---|
| Abstract/Contents: | "Greenhouse experiments were conducted in 1990 to investigate the effects of selected herbicides applied to rhizome johnsongrass (Sorghum halepense (L.) Pers.) at various growth stages on johnsongrass regrowth. Four treatment timings were employed: 2, 4, 6 and 8 weeks after johnsongrass emergence (WAE). The herbicide treatments were 4 and 8 g ai ha-1 AC 263, 222, 32 and 64 g ai ha-1 imazaquin, 16 and 32 g ia ha-1 imazethapyr, 48 and 96 g ai ha-1 fluazifop-P and sethoxydim, and an untreated control. At the end of the third week of growth after treatment, plants were visually rated for injury, and shoot fresh weights were determined. The rhizomes were allowed to initiate regrow [regrowth] for an additional three weeks, at which time fresh weights of the regrowth were determined. All herbicide treatments reduced shoot weight when applied 2 WAE. At the 2 WAE treatment, sethoxydim at 48 g ha-1 provided greatest control by reducing shoot growth to 12% of the untreated. Control was poorest at this timing with 4 g ha-1 AC 263,222, where growth reached 71% of the untreated. At the 4 WAE application timing, sethoxydim provided better control than other herbicides by reducing shoot weight to 36% of the untreated, and 96 g ha-1 fluazifop-P controlled growth to 56% of the untreated. Imazaquin at 32 or 64 g ha-1 applied 4 and 6 WAE did not control johnsongrass. Imazethapyr was effective at both rates when applied 2 WAE, but when application was delayed until 4 WAE the 16 g ha-1 rate did not control growth and the 32 g ha-1 rate controlled growth to only 57% of the untreated. Sethoxydim applied 6 WAE was effective at low and high rates for controlling initial shoot weight. As application date was prolonged, regrowth following 8 g ha-1 AC 263,222 decreased. At 2 WAE, AC 263, 222 controlled regrowth to a level of 62% of the untreated, but when applied 6 WAE AC 263, 222 controlled regrowth to only 3% of the untreated. Sethoxydim provided excellent control of regrowth across all timing and rate combinations. Regrowth did not occur until application were made 8 WAE for the 96 g ha-1 rate and 6 WAE for the 48 g ha-1 rate. When applications were made at 2 and 4 WAE, fluazifop-P did not allow regrowth to occur at either rate; however, when applications were made 6 WAE at 48 g ha-1 control of regrowth was only 68% of the untreated. At 4 WAE, 32 g ha-1 imazaquin controlled regrowth to 19% of the untreated, and at 64 g ha-1 applied 2 WAE imazaquin limited regrowth to 40%." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | This item is an abstract only! |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hayes, R. W., and D. R. Shaw. 1991. Influence of herbicides and application timing on johnsongrass(Sorghum halepense) control and regrowth. South. Weed Sci. Soc. Proc. 44:p. 106. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=29265 |
| If there are problems with this record, send us feedback about record 29265. |
| Choices for finding the above item: |
|---|
| 
MSU catalog number: SB 611 .S6 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
