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 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 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 Control of Rice Water Weevil with Dimilin, 1996A

1997 ◽  
Vol 22 (1) ◽  
pp. 288-288
Author(s):  
J. L. Bernhardt
Keyword(s):  
Experimental Design ◽  
Weed Control ◽  
Salt Water ◽  
Plant Roots ◽  
Silt Loam ◽  
Soil Cores ◽  
Plot Size ◽  
Rice Water Weevil ◽  
Mesh Screen ◽  
Rice Water

Abstract The experimental design was a RCB with 4 replications. Plot size was 9 rows (7 inch spacing) by 20 ft. Each plot was bound by levees. Rice was drill-seeded in Crowley silt loam at 90 lb/acre on 3 May and emerged on 12 May. Propanil and Bolero at 4 and 2 lb (AI)/acre, respectively, were applied for weed control on 29 May. Nitrogen was applied in a 3-way split of 75 lb N/acre as urea on 12 Jun and 30 lb N/acre on 5 and 14 Jul. Permanent flood was established on 12 Jun. All treatments of Dimilin were made with a CO2-pressurized back-pack sprayer at 18 gpa. Furadan 3G was applied 10 d after permanent flood with a hand-shaker. On 3 and 5 Jul and on 9 and 10 Jul five 4X4 inch (diam by depth) soil cores with an average of 5 plants/core were removed from plots. Soil was washed from the plant roots into a 40-mesh screen. The screen was immersed in salt water and RWW immatures were removed. Plots were harvested with a small combine on 13 Sept. Reported yields were adjusted to 12% moisture. Data were analyzed with ANOVA and LSD.

scholarly journals Control of Rice Water Weevil and Rice Stalk Borer with Fipronil, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 259-260
Author(s):  
J.L. Bernhardt
Keyword(s):  
Salt Water ◽  
Row Spacing ◽  
Rice Seed ◽  
Silt Loam ◽  
Soil Cores ◽  
Plot Size ◽  
Mesh Screen ◽  
Foundation Seed ◽  
Rice Water ◽  
Experimental Use

Abstract This was a non-replicated trial with 4 treatments for experimental use permit. Whole-plot size was 3 acres for each treatment. Whole plots were divided into 3 subplots each with 55 ft X 665 ft of planted area. Each subplot was bound by levees. Fipronil 80 WP was tank mixed with water and applied preplant on 23 May by a tractormounted sprayer delivering 10.3 gpa. The insecticide was incorporated with a field cultivator set at a 2-3-inch depth. Foundation rice seed was treated with fipronil 75 FS by Celpril Industries (Manteca, CA). Treated and untreated foundation seed rice was drill seeded in Crowley silt loam at 90 lb/acre (6-inch row spacing) on 23 May and emerged on 29 May. Subplots were temporarily flooded (flushed) on 12-13 Jun to facilitate growth. Thiobencarb (Bolero 8 E), quinclo-rac (Facet 75 DF), and propanil (Stam 4 E) at 3, 0.33, and 1 lb (AI)/acre, respectively, were applied by aircraft for weed control on 2 Jun. Also, propanil at 3 lb (AI)/acre was applied by aircraft on 24 Jun. Permanent flood was established on 24-25 Jun. Furadan 3 G was applied by aircraft on 9 Jul, 14 d after permanent flood. On 17 Jul and 30 Aug, six 4 X 4 inch (diam by depth) soil cores with an average of 6 plants/core were removed from each subplot. Soil was washed from the plant roots into a 40-mesh screen. The screen was immersed in salt water and RWW immatures were removed and counted. In each treatment, 1,330 ft along the edge of subplots was examined for the presence of rice whiteheads with blank florets. Stems of whiteheads were examined for the presence of RSB immatures or for evidence of their presence. Whole subplots were harvested with a combine on 3 and 6 Oct. Recorded yields were adjusted to 12% moisture. Data were analyzed with a 1-way ANOVA and means separated with LSD

scholarly journals Control of Rice Water Weevil with Selected Insecticides, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 260-261
Author(s):  
J.L. Bernhardt
Keyword(s):  
Salt Water ◽  
Plant Roots ◽  
Silt Loam ◽  
Soil Cores ◽  
Emergence Period ◽  
Plot Size ◽  
Mesh Screen ◽  
Rainy Weather ◽  
Foundation Seed ◽  
Rice Water

Abstract The experimental design was a RCB with 6 treatments and 4 replications. Plot size was 9 rows (7-inch spacing) by 20 ft. Each plot was bound by levees. Foundation seed rice was treated with fipronil 75 FS by Celpril Industries (Manteca, CA). Treated and untreated rice was drill seeded by Crowley silt loam at 90 lb/acre on 13 May and emerged between 24 and 28 May. Cool, rainy weather extended the emergence period and contributed to 5 to 15% stand reduction in plots. Propanil (Stam M4) and thiobencarb (Bolero 8 E) at 3 and 2 lb (AI)/acre, respectively, were applied for weed control on 12 Jun. Nitrogen was applied in a 3-way split of 90 lb N/acre as urea on 2 Jul and 30 lb N/acre on 23 and 31 Jul. Permanent flood was established on 27 Jun. Post-flood foliar treatments of Fury, Karate, and Dimilin were made with a CO2-pressurized backpack sprayer at 18 gpa. On 18 and 23 Jul three 4X4 inch (diam by depth) soil cores with an average of 3 plants/core were removed from plots. Soil was washed from the plant roots into a 40-mesh screen. The screen was immersed in salt water and RWW immatures were removed. Plots were harvested with a Yanmar combine on 7 Oct. Reported yields were adjusted to 12% moisture. Data were analyzed with an ANOVA and means separated with LSD.

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.

scholarly journals Granular and Liquid Insecticide Performance Against Corn Rootworm, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 198-198
Author(s):  
A. M. Journey ◽  
K. R. Ostlie
Keyword(s):  
Agricultural Research ◽  
Row Spacing ◽  
Research Station ◽  
Corn Rootworm ◽  
Silt Loam ◽  
University Of Minnesota ◽  
The Press ◽  
Loam Soil ◽  
The University ◽  
Higher Sensitivity

Abstract Experimental plots measuring 2 rows (30-inch row spacing) by 50 ft were planted on 12 May in a Waukegan silt loam soil at the University of Minnesota Agricultural Research Station, Rosemount. Treatments were arranged in a RCBD with 4 replications. Granular insecticides were applied with a modified Noble applicator at planting, either banded ahead of the press wheel or in furrow. Postemergence (25 Jun) sidedress applications of liquid insecticides were made with a CO2-powered backpack sprayer at 20 gpa. Percent lodging was determined on 16 Aug. On 25 Aug, 5 roots from each plot were dug, washed, and rated using the Iowa 1-6 scale (with half-point increments for higher sensitivity).

scholarly journals Control of Rice Water Weevil with Fipronil Applied Preplant Incorporated, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 225-225
Author(s):  
J. L. Bernhardt
Keyword(s):  
Experimental Design ◽  
Salt Water ◽  
Plant Roots ◽  
Row Spacing ◽  
Silt Loam ◽  
Soil Cores ◽  
Plot Size ◽  
Untreated Check ◽  
Small Plot ◽  
Rice Water

Abstract Three rates of fipronil (EXP60655A 1.5G) applied preplant and lightly incorporated were compared with carbofuran (Furadan 3G) and an untreated check for control of RWW. Experimental design was a RCB with 4 replications. Plot size was 9 rows (7 inch row spacing) × 16 ft. Rice was drill-seeded in a Crowley silt loam at 110 lb/acre 12 May and emerged 20 May. Fipronil was applied broadcast with a hand shaker and lightly incorporated with a hand rake on 12 May. Propanil and thiobencarb at 2 lb (AI)/acre each and bentazon at 1 lb (AI)/acre were applied 1 Jun. Permanent flood was applied on 13 Jun. Nitrogen was applied in a 3-way split of 120 lb/acre on 13 Jun and 30 lb/acre each on 15 and 26 Jul. Furadan 3G was applied broadcast with a hand shaker on 20 Jun. On 5 and 12 Jul five 4 × 4 inch (diam by depth) soil cores were removed from each plot. Soil was washed from plant roots into 40-mesh screens. Screens were immersed in salt water and RWW immatures were recovered and counted. The center 4 rows × 12 feet of plots were harvested on 27 Sep with a small plot combine. Reported yields were adjusted to 12% moisture.

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.

Sign in / Sign up

Export Citation Format

Share Document