Red Rice (Oryza sativa) Control in Drill-Seeded Rice (O. sativa)

Weed Science ◽  
1985 ◽  
Vol 33 (5) ◽  
pp. 703-707 ◽  
Author(s):  
Amadou Diarra ◽  
Roy J. Smith ◽  
Ronald E. Talbert
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Field Experiments ◽  
Growing Season ◽  
Rice Cultivar ◽  
Rice Grain ◽  
Rice Seed ◽  
Red Rice ◽  
Culm Density ◽  
High Yields

Field experiments were conducted to investigate methods of controlling red rice (Oryza sativaL. ♯ ORYSA) in drill-seeded rice (O. sativa). Treatments included the rice cultivar ‘Mars', coated with calcium peroxide (CaO2) at 40% (w/w) and a crop protectant, R-33865 (O,O-diethyl-O-phenyl phosphorothioate) at 0.5 and 1% (v/w). Molinate (S-ethyl hexahydro-1H-azepine-1-carbothioate) at 6.7 kg ai/ha was applied preplant incorporated (ppi). The land was flooded (2.5 to 5 cm deep) after seeding with rice (100 kg/ha, 2.5 cm deep), and the water was maintained throughout the growing season. CaO2, with or without molinate, increased rice grain yield 50% and increased rice culm density fivefold above untreated rice. Molinate applied ppi controlled 96% of the red rice. Rice seed coated with only CaO2or with CaO2plus R-33865 at 0.5%, each combined with ppi molinate, produced 5690 and 6030 kg/ha of grain, respectively. These high yields were associated with red rice control by molinate and good stands of rice provided by O2supplied by CaO2. R-33865 applied to rice seed at 1% (v/w) injured rice by reducing rice culm densities 41%, compared with rice without protectant.

Effect of Flood Timing on Red Rice (Oryzaspp.) Control with Imazethapyr Applied at Different Dry-Seeded Rice Growth Stages

2005 ◽  
Vol 19 (2) ◽  
pp. 476-480 ◽  
Author(s):  
Luis A. Avila ◽  
Scott A. Senseman ◽  
Garry N. McCauley ◽  
James M. Chandler ◽  
John H. O'Barr
Keyword(s):  
Grain Yield ◽  
Field Experiments ◽  
Rice Cultivar ◽  
Growth Stages ◽  
Rice Grain ◽  
Red Rice ◽  
Cultivated Rice ◽  
Leaf Stage ◽  
Rice Growth ◽  
Herbicide Treatment

Field experiments were conducted in 2002 and 2003 in Beaumont, TX, to evaluate the effect of flood timing on red rice control with imazethapyr applied at different cultivated rice growth stages. Treatments included flood establishment at 1, 7, 14, and 21 d after postemergence (POST) herbicide treatment (DAT). Imazethapyr was applied preemergence at 70 g ai/ha followed by 70 g/ ha POST when imidazolinone-tolerant rice cultivar ‘CL-161’ had three- to four-leaf stage (EPOST) or five-leaf stage (LPOST). Flood needed to be established within 14 DAT to achieve at least 95% red rice control when imazethapyr was applied EPOST. However, flood needed to be established within 7 DAT to provide at least 95% red rice control when imazethapyr was applied LPOST. Delaying the flood up to 21 DAT reduced rice grain yield for both application timings.

Red Rice (Oryza sativa) Control and Suppression in Rice (O. sativa)

1991 ◽  
Vol 5 (4) ◽  
pp. 811-816 ◽  
Author(s):  
Sam L. Kwon ◽  
Roy J. Smith ◽  
Ronald E. Talbert
Keyword(s):  
Oryza Sativa ◽  
Plant Growth ◽  
Grain Quality ◽  
Field Experiments ◽  
Red Rice ◽  
Two Cultures ◽  
The Two Cultures ◽  
Rice Yields ◽  
Sequential Treatments ◽  
High Yields

Two field experiments were conducted from 1986 to 1988 to determine efficacy of herbidices and plant growth regulators for red rice control and suppression in water- and drill-seeded rice. Molinate applied PPI with fenoxaprop applied at panicle initiation (PI) of rice controlled 94 and 86% of red rice in water- and drill-seeded rice, respectively, compared with 79 and 49%, respectively, for molinate PPI alone in the two cultures. Although this treatment injured rice slightly (< 30%), rice so treated produced high yields with improved grain quality. Sequential treatments of molinate PPI followed by sethoxydim applied at PI or amidochlor applied at > 90% heading produced comparable rice yields with improved red rice control or suppression and grain quality in both cultures, compared with PPI molinate. Drill-seeded rice treated with molinate PPI followed by fenoxaprop applied at late boot or MH (maleic hydazide) applied 7 d after heading produced higher yield than rice treated with molinate PPI.

Competition of Bearded Sprangletop (Leptochloa fascicularis) with Rice (Oryza sativa)

Weed Science ◽  
1983 ◽  
Vol 31 (1) ◽  
pp. 120-123 ◽  
Author(s):  
Roy J. Smith
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Paddy Rice ◽  
Rice Grain ◽  
Rice Seed ◽  
Weed Density ◽  
Weed Plant ◽  
Linear Decrease ◽  
Head Rice ◽  
Rice Yields

Yields of drill-seeded paddy rice (Oryza sativaL. ‘Lebonnet’) at optimum stands of 215 to 270 plants/m2at Stuttgart, Arkansas, were reduced 9, 18, 20, and 36% by bearded sprangletop [Leptochloa fascicularis(Lam.) Gray] densities of 11, 22, 54, and 108 plants/m2, respectively. There was a linear decrease in rice grain yield of 21 kg/ha for each bearded sprangletop plant per square meter. Weed densities of 54 and 108 plants/m2reduced head-rice yields (whole milled kernels) and a density of 108 plants/m2reduced germination of rice seed. The number of bearded sprangletop panicles produced per weed plant decreased as the weed density increased.

Barnyardgrass (Echinochloa crus-galli) Control with Postemergence Applications of Propanil and Clomazone in Dry-Seeded Rice (Oryza sativa)

1998 ◽  
Vol 12 (3) ◽  
pp. 537-541 ◽  
Author(s):  
David L. Jordan ◽  
J. Andrew Kendig
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Field Experiments ◽  
Rice Yield ◽  
Rice Grain ◽  
Single Application ◽  
Consistent Increase ◽  
Better Than

Field experiments were conducted to compare barnyardgrass control and rice grain yield following a single postemergence (POST) application of propanil plus clomazone with single or repeat POST applications of propanil alone or single POST applications of propanil plus pendimethalin, molinate, quinclorac, or thiobencarb. In four of 10 experiments, propanil plus clomazone controlled barnyardgrass better than single or repeat applications of propanil alone or single applications of propanil plus pendimethalin, molinate, quinclorac, or thiobencarb. The most consistent increase in rice yield over a single application of propanil occurred where clomazone was applied in mixture with propanil.

Weed Control Programs in Drill-Seeded Imidazolinone-Resistant Rice (Oryza sativa)

2006 ◽  
Vol 20 (4) ◽  
pp. 956-960 ◽  
Author(s):  
Wei Zhang ◽  
Eric P. Webster ◽  
Kristie J. Pellerin ◽  
David C. Blouin
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Weed Control ◽  
The Other ◽  
Rice Grain ◽  
Red Rice ◽  
Control Programs ◽  
Hemp Sesbania

A study was conducted to evaluate weed control with imazethapyr applied at different timings or a combination of timings with or without an early POST application of bensulfuron, bentazon plus aciflurofen, bispyribac, carfentrazone, halosulfuron, propanil plus molinate, or triclopyr in drill-seeded imidazolinone-resistant rice. Control of barnyardgrass, red rice, and alligatorweed was insufficient with imazethapyr at 87 g/ha PRE or at 53 g/ha late POST alone. Imazethapyr at 87 g/ha PRE followed by imazethapyr at 53 g/ha late POST controlled red rice 86% or greater but did not control hemp sesbania. The imazethapyr PRE followed by late POST combination was also weak on barnyardgrass and alligatorweed early in the season. The addition of an early POST application of the other herbicides to the imazethapyr combination improved overall weed control, especially hemp sesbania control. Among the early POST herbicides, bispyribac, carfentrazone, or propanil plus molinate were more effective in helping improve the overall weed control, resulting in better rice grain yield.

Integration of Molinate use with Water Management for Red Rice (Oryza sativa) Control in Water-seeded Rice (Oryza sativa)

Weed Science ◽  
1986 ◽  
Vol 34 (6) ◽  
pp. 916-922 ◽  
Author(s):  
John B. Baker ◽  
Earl A. Sonnier ◽  
James W. Shrefler
Keyword(s):  
Water Management ◽  
Oryza Sativa ◽  
Grain Yield ◽  
Management Practice ◽  
Substantial Reduction ◽  
Stand Density ◽  
Superior Performance ◽  
Rice Grain ◽  
Red Rice ◽  
Excellent Tool

Integration of preplant-incorporated molinate (S-ethyl hexahydro-1H-azepine-1-carbothioate) at 4.5 kg ai/ha and a brief postseeding drainage period in water-seeded rice (Oryza sativaL.) gave the best red rice (Oryza sativaL. # ORYSA) control without a significant reduction in cultivar stand density. This combination of practices provided higher cultivar grain yield and lower red rice grain yield than any water management practice alone. Continuous-flood water management provided a substantial reduction in red rice stand density, but it also caused a significant reduction in the cultivar stand density. Under the reduced stand density conditions, the red rice was very competitive and yielded more than the cultivar. Although brief drainage alone gave a significantly lower level of red rice control, it had no significant effect on the cultivar stand density, and the red rice and cultivar yields were not significantly different from the continuous-flood yields. Prolonged drainage had the highest red rice and cultivar stand densities and the highest red rice grain yield, but the cultivar yield was not significantly different from the other plots that were not treated with herbicide. Although this treatment gave the highest total grain yield, its composition had the highest percentage of red rice. Puddling the seedbed did not alter the stands or yields of red rice or cultivar compared to the nonpuddled plots with the same water management and herbicide rate. The application of molinate as a preplant-incorporated treatment or as a preplant postflood treatment before or after puddling gave results that were not significantly different from each other. The superior performance of preplant application of molinate in water-seeded rice in conjunction with a brief postseeding drainage period provides an excellent tool for red rice suppresion.

Rice (Oryza sativa) Response to Imazaquin Residues in a Soybean (Glycine max) and Rice Rotation

1989 ◽  
Vol 3 (3) ◽  
pp. 513-517 ◽  
Author(s):  
Ronnie S. Helms ◽  
Timothy N. Tripp ◽  
Roy J. Smith ◽  
Ford L. Baldwin ◽  
Max Hackworth
Keyword(s):  
Oryza Sativa ◽  
Glycine Max ◽  
Field Experiments ◽  
Growing Season ◽  
Rice Grain ◽  
Soil Series ◽  
Grain Yields ◽  
Methods Of Application

Nine field experiments were conducted from 1984 through 1988 to determine the effect on rice of imazaquin applied to soybeans the previous growing season. Imazaquin was applied preplant incorporated, preemergence, or postemergence at rates ranging from 70 to 560 g ai/ha. ‘Bond’, ‘Lemont’, ‘Mars', ‘Newbonnet’, and ‘Tebonnet’ rice were planted the following year. Across all locations, years, cultivars, soil series, methods of application, and imazaquin rates, rice injury symptoms were not observed, and rice grain yields were not reduced by imazaquin residues.

Interaction of Propanil and Selected Insecticides on Rice (Oryza sativa)

Weed Science ◽  
1986 ◽  
Vol 34 (5) ◽  
pp. 800-803 ◽  
Author(s):  
Khosro Khodayari ◽  
Roy J. Smith ◽  
N. Philip Tugwell
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Methyl Parathion ◽  
Field Experiments ◽  
Potential Interaction ◽  
Rice Grain ◽  
Rice Plants ◽  
Carbamate Insecticides

Field experiments determined the potential interaction of insecticides and propanil [N-(3,4-dichlorophenyl) propanamide] in drill-seeded rice (Oryza sativaL. ‘Bond’). The carbamate insecticides carbaryl (1-naphthylmethylcarbamate) and methomyl {S-methylN-[(methylcarbamoyl) oxy] thioacetimidate} interacted more severely with propanil than the organophosphate methyl parathion [O,O-dimethylO-(p-nitrophenyl) phosphorothioate] in emulsifiable or encapsulated formulations. Carbaryl and methomyl injured rice vegetatively when applied from 7 days before to 4 days after propanil. Carbaryl was the only insecticide that interacted with propanil to reduce rice grain yield. Insecticides interacted adversely with propanil on rice grain yield when they were applied 2 days before propanil treatment. Insecticide interactions with propanil from most to least phytotoxic to rice plants for all times of application were: carbaryl > methomyl > emulsifiable methyl parathion > encapsulated methyl parathion.

scholarly journals Effects of irrigated rice sowing season and imazapyr + imazapic time of application on rice grain yield and red rice management

2013 ◽  
Vol 31 (3) ◽  
pp. 631-644 ◽  
Author(s):  
G.M.S. Sartori ◽  
E. Marchesan ◽  
C.F. Azevedo ◽  
A.C. Filho ◽  
R. Roso ◽  
...  
Keyword(s):  
Grain Yield ◽  
Block Design ◽  
Sowing Date ◽  
Joint Analysis ◽  
Rice Grain ◽  
Rice Seed ◽  
Red Rice ◽  
Irrigated Rice ◽  
Time Of Application ◽  
Sowing Season

Irrigated rice sowing season and red rice competition are among the main factors affecting grain yield. The objective of this work was to evaluate the sowing date of irrigated rice and moments of application of the herbicide imazapyr + imazapic to control red rice management and irrigated rice grain yield. Eight experiments were performed at the following dates (09/30, 10/19, 11/08 and 12/01) for the 2010/2011 harvest season and (09/27, 10/17, 11/08 and 12/05) for the 2011/2012 harvest season. The treatments were: application of the herbicide imazapyr + imazapic at doses of 105+35 g ha-1 in pre-emergence (PRE); 52.5+17.5 g ha‑1 in pre-emergence and 52.5+17.5 g ha-1 in post-emergence (PRE + POST); and 105+35 g ha-1 in post- emergence (POST), and a control without application and no weeding. The cultivar Puitá Inta CL was used and a randomized block design with four replicates. A joint analysis of the experiments was carried out. There was less emergence of red rice and higher grain yield of the irrigated rice at the early periods (09/30/10 and 09/27/11), with 10,578 and 8,653 kg ha-1, respectively. At the end of the season (12/01/10 and 12/05/11), there was greater reduction of the red rice seed bank. Sowing at the beginning of the recommended period provided more irrigated rice grain yield. The application of imazapyr + imazapic at a dose of 52.5+17.5 g ha-1 in PRE + 52.5+17.5 g ha-1 POST, and 105+35 g ha-1 only in PRE and POST was effective in the control of red rice.

Reciprocal Yield Analysis of Red Rice (Oryza sativa) Competition in Cultivated Rice

Weed Science ◽  
1991 ◽  
Vol 39 (1) ◽  
pp. 42-47 ◽  
Author(s):  
Dan J. Pantone ◽  
John B. Baker
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Rice Plant ◽  
Competitive Ability ◽  
Field Experiments ◽  
Yield Losses ◽  
Red Rice ◽  
Cultivated Rice ◽  
Yield Model ◽  
Yield Analysis

Four years of field experiments were used to assess the competitive ability of red rice, a weedy variety of rice, and ‘Mars’, a cultivar of rice. Red rice was the dominant competitor each of the 4 yr, and an average of one red rice plant reduced Mars grain yield per plant equal to the effect of four Mars plants. Intervarietal competition was more important than intravarietal competition for Mars, whereas the reverse was true for red rice. The product of the coefficients for intravarietal competition did not significantly exceed the product of the coefficients for intervarietal competition, indicating that the two varieties were competing for the same resources. Using the reciprocal yield model coefficients from 1989, grain yield losses of Mars, due to red rice densities of 4, 16, 25, and 300 plants m−2, were predicted to approximate 13, 37, 48, and 92%, respectively, at a fixed cultivar density of 100 plants m−2.

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