scholarly journals Evaluation of Dimilin for Rice Water Weevil Control, 1995

1998 ◽  
Vol 23 (1) ◽  
pp. 261-262
Author(s):  
M. A. Muegge ◽  
J. D. Barbour ◽  
W. C. Rice ◽  
P. A. Bollich
Keyword(s):  
Treatment Effect ◽  
Rice Yield ◽  
Sampling Error ◽  
Research Station ◽  
Rice Water Weevil ◽  
Wire Screen ◽  
Rough Rice ◽  
Significant Difference ◽  
Error Terms ◽  
Rice Water

Abstract Dimilin was evaluated for control of adult rice water weevil at the Rice Research Station, Crowley, LA. Collectively levied plots, 5 X 20 ft, were arranged in a RBD with 4 blocks and 5 treatments with sub-sample nesting within the block X treatment effect. Fertilizer was incorporated pre-plant and applied broadcast 3 wk post-flood at 90 lb (13-13-13) and 50 lb (21-0-0) N-P-K/acre respectively. Plots were water seeded 29 May with pre-soaked ‘Cyprus’ rice at 138 lb seed/acre to Crowley silt loam and permanently flooded 8 Jun. Foliar applications of Dimilin 25 W were made at 0.25 or 0.125 lb (AI)/acre. Furadan 3 G was applied at RWW threshold (5 larvae/sample) at 0.6 lb (AI)/acre using a hand-held shaker. Dimilin 25 W applications were made using a CO2 backpack sprayer delivering 15 gpa at 16 psi with 80015VS flat-fan spray nozzles on a 3 ft boom. Rice water weevil eggs were counted from 5 randomly selected plants per plot beginning 2 d after flood then weekly until RWW threshold. Three randomly selected soil samples per plot were taken 26 Jun, 3 and 11 Jul using a 4 X 4 in core sampler. Individual samples were washed through a funnel, fitted with wire screen, into a 35-mesh screen sieve. Collected RWW larvae and pupae were floated in a saturated NaCl solution, and counted. Rough rice yield (lb/acre) was determined by hand-harvesting one random 3-ft2 sample per plot on 19 Sep. Moisture content of harvested grain was determined and standardized to 12% for determination of rough rice yield. RWW larval data were log transformed to improve normality. All data were subjected to ANOVA. Experimental and sampling error terms for the RWW larval data were tested for homogeneity of variances, and pooled error terms were used to test the treatment effect when appropriate. Protected least significant difference (LSD) was used for treatment mean separation.

scholarly journals Evaluation of Selected Insecticides For Rice Water Weevil Control, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 293-294
Author(s):  
M.A. Muegge ◽  
J.D. Barbour ◽  
W.C. Rice ◽  
P.A. Bollich
Keyword(s):  
Treatment Effect ◽  
Research Station ◽  
Rice Water Weevil ◽  
Wire Screen ◽  
Appropriate Treatment ◽  
Mesh Screen ◽  
Significant Difference ◽  
Error Terms ◽  
Rice Water

Abstract Several insecticides applied at various rates, formulations, and times were evaluated for control of adult rice water weevil at the Rice Research Station, Crowley, LA. Plots, 5 X 25 ft, were arranged in a RB design with 4 blocks and 11 treatments with sub-sample nesting within the block X treatment effect. Fertilizer was pre-plant incorporated at 45 lb (23-12-12) N-P-K/acre and applied broadcast 4 and 6 wk post-flood at 45 lb (23-12-12) and 55 lb (21-0-0) N-P-K/acre respectively. Plots were drill-seeded with ‘Cyprus’ rice at 90 lb of seed/acre to Crowley silt loam on 2 May, flushed on 21 May and permanently flooded 28 May. The her-bicides Basagran, Stam, Arrosolo, and Ordram were applied to control weeds. Basagran and Stam were applied at 0.5 and 4.0 lb(AI)/acre on 27 May. Arrosolo and Ordram were applied aerially at 3.5 lb(AI)/acre on 4 Jun and 3.0 lb(AI)/acre on 11 Jun, respectively. All pesticide applications except Furadan 3G were made using a CO2 backpack sprayer delivering 15 gpa at 28 psi with 110015VS flat-fan nozzles on a 3 ft boom. Three randomly selected soil samples per plot were taken 11,18 and 26 Jun using a 4 X 4 inch core sampler. Individual samples were washed through a funnel, fitted with wire screen, into a 35 mesh screen sieve. Collected rice water weevil (RWW) larvae and pupae were floated in a saturated NaCl solution, and counted. Plots were harvested on 11 Sep using a Kubota combine. Moisture content of harvested grain was determined and standardized to 12% moisture for determination of yield. Rice water weevil larval data were log transformed to improve normality before being subjected to analysis of variance. The experimental and sam-pling error terms for the RWW larval data were tested for homogeneity of variances, and pooled error terms were used to test the treatment effect when appropriate. Treatment means were separated using protected least significant difference (LSD) at P = 0.05.

scholarly journals Evaluation of Furadan and Payload for Rice Water Weevil Control, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 257-257
Author(s):  
M. A. Muegge ◽  
J. D. Barbour ◽  
G. B. Trahan ◽  
P. A. Bollich
Keyword(s):  
Row Spacing ◽  
Research Station ◽  
Silt Loam ◽  
Orthogonal Contrasts ◽  
Rice Water Weevil ◽  
Wire Screen ◽  
Pesticide Treatment ◽  
Mesh Screen ◽  
Application Date ◽  
Rice Water

Abstract Furadan and Payload were evaluated for control of rice water weevil at the Rice Research Station, Crowley, LA. Plots, 1.22 × 7.5 m, were individually leveed and arranged in a RCBD with 4 replicates and 4 treatments. Fertilizer was incorporated pre-plant and applied broadcast 3 wk post-flood at 50.6 kg (13-13-13) and 101.2 kg (21-0-0) N-P-K/ha respectively. Plots were drill seeded (17.5 cm row spacing) to Crowley silt loam with ‘Cyprus’ rice at 112.5 kg seed/ha on 12 May, flush irrigated 14 and 21 May, and permanently flooded 28 May. Propanil was applied at 3.34 kg/ha on 26 May using a CO2 backpack sprayer delivering 141.9 liters/ha at 1.8 kg/cm2 for weed control. Benomyl was aerially applied at 0.56 kg/ha on 28 Jun to control rice blast. Furadan 3G was applied 15 d post-flood using a hand-held shaker. Payload 15G was applied 15 d post-flood and at 2.95 kg/ha 15 and 29 d post-flood. Two randomly selected soil samples per plot were taken every 7 d starting 9 Jun and ending 21 Jul using a 10.2 × 10.2 cm core sampler. Individual samples were washed through a funnel, fitted with wire screen, into a 35 mesh screen sieve. Collected RWW larvae and pupae were floated in a saturated NaCl solution, counted and corrected for the number of rice plants per core. Effects of pesticide treatment on numbers of immature RWW were determined by ANOVA using orthogonal contrasts to separate the following mean comparisons: 1) Untreated vs Treated; 2) Furadan 3G vs Payload 15G applied once at 5.9 kg/ha and Payload applied twice a 2.95 kg/ha/application date; (3) Payload 15G applied once at 5.9 kg/ha vs Payload applied twice at 2.95 kg/ha/application. Because no significant differences in larva numbers were found among the Payload treatments, these were pooled and the following contrasts made: 1) Untreated vs Treated; 2) Furadan 3G vs Payload 15G. Analysis was performed using larval counts corrected and uncorrected for the number of plants per core, since these analyses produced similar results, only uncorrected means are presented in the table. All analyses were conducted at the 0.05 probability level.

scholarly journals Evaluation of Selected Insecticides For Rice Stink Bug, Blackfaced Leafhopper And Grasshopper Control, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 294-295
Author(s):  
T.M. Papenburg ◽  
M.A. Muegge ◽  
P.A. Bollich
Keyword(s):  
Sampling Error ◽  
Block Design ◽  
Least Square ◽  
Research Station ◽  
Stink Bug ◽  
Homogeneity Of Variances ◽  
Randomized Block Design ◽  
Sample Data ◽  
Plastic Bag ◽  
Error Terms

Abstract Selected insecticides were evaluated for control of RSB, BFL and grasshoppers at the Rice Research Station, Crowley, LA. Plots, 5 X 20 ft, were arranged in a randomized block design with four replicates and six treatments. Fertilizer was incorporated pre-plant and applied broadcast 12 wk post-flood at 100 lb (13-13-13) and 50 lb (21-0-0) N-P-K/acre respectively. Plots were drill-seeded to Crowley silt loam with ‘Cyprus’ rice at 100 lb seed/acre on 1 May and permanently flooded 21 Jun. Foliar applications of the insecticides were made on 23 Jul using a CO2 backpack sprayer delivering 15 gpa at 28 psi with 110015 VS flat-fan nozzles on a 3 ft boom. A standard 15 inch diam sweepnet was used to collect samples (18 sweeps per plot) beginning on 23 Jul and continuing weekly for 3 consecutive wk. Individual sweepnet samples were placed in a plastic bag, frozen, and the contents counted for total number of RSB, BFL, and grasshoppers. The center 4 rows of each plot were harvested on 11 Sep using a Kubota combine. Moisture content of harvested grain was determined and then standardized to 12% moisture for calculation of yield. Pecky rice injury was expressed as a percentage of injured seed found in three 100-seed subsamples per plot. Sample data were subjected to ANOVA. The experimental and sampling error terms for the pecky rice data were tested for homogeneity of variances, and pooled error terms used to test the treatment effect when appropriate. All data were subjected to mean separation using the protected least square difference (LSD) procedure at P – 0.05.

Rice Water Weevil (Coleoptera: Curculionidae) Population Dynamics in Louisiana

2004 ◽  
Vol 39 (4) ◽  
pp. 623-642 ◽  
Author(s):  
Hanwu Shang ◽  
Michael J. Stout ◽  
Zhitao Zhang ◽  
Jiaan Cheng
Keyword(s):  
Population Dynamics ◽  
Growing Season ◽  
Research Station ◽  
Light Traps ◽  
Lissorhoptrus Oryzophilus ◽  
Ratoon Crop ◽  
Rice Water Weevil ◽  
Louisiana State University ◽  
Flight Muscles ◽  
Rice Water

The rice water weevil, Lissorhoptrus oryzophilus Kuschel, has long been an important pest of rice in the U.S. and has recently emerged as a pest of rice in Asia. A systematic study of the life history and population dynamics of this insect was conducted during the 2002 growing season at the Louisiana State University Rice Research Station, Crowley, Acadia Parish, LA, an area where it is a particularly severe pest. By monitoring weevil populations using collections from overwintering sites, from plots of rice planted throughout the growing season, and from light traps, and by dissecting collected weevils to assess the conditions of their fat bodies, flight muscles and ovaries, we concluded that a portion of the weevil population in Louisiana is univoltine, another portion is bivoltine, and another portion may pass through multiple generations if young rice is continually available. However, only one generation of weevils developed in a single rice field. Adult weevils invaded rice fields in apparently large numbers prior to flooding. Weevils possessing both well-developed ovaries and well-developed flight muscles were found in both light traps and rice plots, suggesting that adults were capable of seeking new habitats by flying if rice plants were not suitable for oviposition. Weevils were able to complete a generation on ratoon-crop rice. The emergence of overwintered weevils started in late March, with peak emergence occurring during April and May. Return to overwintering sites began in early June and continued until October. Weevils appeared to move among overwintering habitats. A comparison of weevil population dynamics in rice plots planted on different dates supported the use of early planting as a management strategy.

Evaluation of sequential applications of quizalofop-p-ethyl and propanil plus thiobencarb in acetyl-coA carboxylase inhibitor–resistant rice

2020 ◽  
Vol 34 (4) ◽  
pp. 506-510
Author(s):  
Samer Y. Rustom ◽  
Eric P. Webster ◽  
Benjamin M. McKnight ◽  
David C. Blouin
Keyword(s):  
Field Study ◽  
Weed Control ◽  
Rice Yield ◽  
Weedy Rice ◽  
Research Station ◽  
Acetyl Coa Carboxylase ◽  
Red Rice ◽  
Acetyl Coa ◽  
Rough Rice ◽  
Before And After

AbstractA field study was conducted in 2015 and 2016 at the H. Rouse Caffey Rice Research Station near Crowley, Louisiana, to evaluate the interactions of quizalofop and a mixture of propanil plus thiobencarb applied sequentially or mixed to control weedy rice and barnyardgrass. Visual weed control evaluations occurred at 14, 28, and 42 d after treatment (DAT). Quizalofop was applied at 120 g ai ha−1 at 7, 3, and 1 d before and after propanil plus thiobencarb were each applied at 3,360 g ai ha−1. In addition, quizalofop was applied alone and in a mixture with propanil plus thiobencarb at day 0. Control of red rice ‘CL-111’ and ‘CLXL-745’ was greater than 91% when quizalofop was applied alone at day 0, similar to control for quizalofop applied 7, 3, and 1 d prior to propanil plus thiobencarb at all evaluation dates. Control of the same weeds treated with quizalofop plus propanil plus thiobencarb applied in a mixture at day 0 was 70% to 76% at each evaluation date, similar to quizalofop applied 1 or 3 d after propanil plus thiobencarb. A similar trend in control of barnyardgrass by 88% to 97% occurred when quizalofop was applied alone and by 48% to 53% at 14, 28, and 42 DAT when the mixture was used. ‘PVL01’ rough rice yield was 4,060 kg ha−1 when treated with quizalofop alone; however, yield was reduced to 3,180 kg ha−1 when it was treated with quizalofop mixed with propanil plus thiobencarb at day 0, similar to PVL01 rice treated with quizalofop 1 or 3 d following the propanil plus thiobencarb application.

Interactions of Clomazone Plus Pendimethalin Mixed with Propanil in Rice

2021 ◽  
pp. 1-21
Author(s):  
Matthew J. Osterholt ◽  
Eric P. Webster ◽  
Benjamin M. McKnight ◽  
David C. Blouin
Keyword(s):  
Rice Field ◽  
Rice Yield ◽  
Research Station ◽  
State University ◽  
Yellow Nutsedge ◽  
Louisiana State University ◽  
Rough Rice ◽  
Herbicide Mixtures ◽  
Synergistic Response

A study was conducted at the Louisiana State University Agricultural Center’s H. Rouse Caffey Rice Research Station in 2017 and 2018 to evaluate the interaction between a pre-package mixture of clomazone plus pendimethalin applied at 0, 760, 1145, or 1540 g ai ha-1 mixed with propanil at 0, 1120, 2240, or 4485 g ai ha-1. A synergistic response occurred when barnyardgrass was treated with all rates of clomazone plus pendimethalin mixed with either rate of propanil evaluated at 56 d after treatment. Unlike barnyardgrass, an antagonistic response occurred for yellow nutsedge control when treated with 760 and 1540 g ha-1 of clomazone plus pendimethalin mixed with 1120 or 2240 g ha-1 of propanil at 28 d after treatment; however, 1145 g ha-1 of clomazone plus pendimethalin mixed with 4485 g ha-1 of propanil resulted in a neutral interaction. At 28 d after treatment, Rice flatsedge treated with for all herbicide mixtures resulted in neutral interactions. The synergism of clomazone plus pendimethalin applied at 1540 g ha—1 mixed with propanil applied at 2240 or 4485 g ha-1 for barnyardgrass control resulted in an increased rough rice yield compared with 760 or 1145 g ha-1 of clomazone plus pendimethalin mixed with propanil applied at 1120 or 2240 g ha-1. These results indicate if barnyardgrass and rice flatsedge are present in a rice field the pre-package mixture of clomazone plus pendimethalin mixed with propanil can be an option for growers. However, if yellow nutsedge infest the area other herbicides may be needed.

Nitrogen Requirement of Potato for Eastern Indo-Gangatic Plain of India

2020 ◽  
Vol 7 (03) ◽  
Author(s):  
S. K. YADAV ◽  
R. K. SINGH ◽  
V. K. DUA ◽  
S SINGH ◽  
SARALA YADAV ◽  
...  
Keyword(s):  
Tuber Yield ◽  
Potato Crop ◽  
Block Design ◽  
Nitrogen Level ◽  
Cost Ratio ◽  
Research Station ◽  
Net Benefit ◽  
Marketable Tuber ◽  
Benefit Cost Ratio ◽  
Significant Difference

A field experiment was carried out during 2015-16 and 2016-17 at ICAR-Central Potato Research Station, Patna, Bihar, in randomized block design with four replications with objective to quantity the optimum requirement of nitrogen to potato crop. Significantly the highest plant height was recorded with nitrogen level of 300 kg/ha. Distributions of the smallest size of tuber yield of potato were decreasing with increasing the level of nitrogen. There was about 26.0% more yield of the smallest size tuber of potato was recorded with zero nitrogen as compare to the highest level of nitrogen i.e. 300 kg/ha. Increasing the nitrogen over the level of 150 to 225 kg per hectare, increasing the yield of tuber gradually slower rate than nitrogen level from 0 to 150 kg/ha. Total and marketable tuber yield of potato were increasing significantly with increasing level of nitrogen up to 150 kg/ha. There was no significant difference in marketable tuber yield was found for nitrogen level between 150 and 225 kg/ha. Highest (1.66) net benefit cost ratio was also recorded with level of nitrogen @ 150 kg/ha in potato. Hence, application of nitrogen @ 150 kg/ha was found statistically and economically more beneficial for potato cultivation in Eastern Indo-Gangatic plain of India.

scholarly journals Chromosome Unipolar Division and Low Expression of Tws May Cause Parthenogenesis of Rice Water Weevil (Lissorhoptrus oryzophilus Kuschel)

Insects ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 278
Author(s):  
Pengcheng Wang ◽  
Fangyuan Yang ◽  
Zhuo Ma ◽  
Runzhi Zhang
Keyword(s):  
Drosophila Melanogaster ◽  
Quantitative Pcr ◽  
Ovarian Tissue ◽  
Expression Patterns ◽  
Meiotic Spindle ◽  
Lissorhoptrus Oryzophilus ◽  
Rice Water Weevil ◽  
Rice Water ◽  
Beijing China ◽  
Low Expression

Rice water weevil (RWW) is divided into two types of population, triploid parthenogenesis and diploid bisexual reproduction. In this study, we explored the meiosis of triploid parthenogenesis RWW (Shangzhuang Town, Haidian District, Beijing, China) by marking the chromosomes and microtubules of parthenogenetic RWW oocytes via immunostaining. The immunostaining results show that there is a canonical meiotic spindle formed in the triploid parthenogenetic RWW oocytes, but chromosomes segregate at only one pole, which means that there is a chromosomal unipolar division during the oogenesis of the parthenogenetic RWW. Furthermore, we cloned the conserved sequences of parthenogenetic RWW REC8 and Tws, and designed primers based on the parthenogenetic RWW sequence to detect expression patterns by quantitative PCR (Q-PCR). Q-PCR results indicate that the expression of REC8 and Tws in ovarian tissue of bisexual Drosophila melanogaster is 0.98 and 10,000.00 times parthenogenetic RWW, respectively (p < 0.01). The results show that Tws had low expression in parthenogenetic RWW ovarian tissue, and REC8 was expressed normally. Our study suggests that the chromosomal unipolar division and deletion of Tws may cause parthenogenesis in RWW.

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