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 Studies on the population dynamics of the rice water weevil, Lissorhoptrus oryzophilus Kuschel (coleoptera: curculionidae).

1984 ◽  
Vol 28 (4) ◽  
pp. 274-281 ◽  
Author(s):  
Jun-ichi KAYUMI ◽  
Keizi KIRITANI ◽  
Tsugio SHIMOHATA ◽  
Hiroyuki YASUDA ◽  
Hitoshi TSUZUKI ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Lissorhoptrus Oryzophilus ◽  
Rice Water Weevil ◽  
Rice Water

The Effects of Four Insecticides on the Population Dynamics of the Rice Water Weevil, Lissorhoptrus oryzophilus Kuschel2

2000 ◽  
Vol 35 (1) ◽  
pp. 48-61 ◽  
Author(s):  
Michael J. Stout ◽  
William C. Rice ◽  
Rita M. Riggio ◽  
Dennis R. Ring
Keyword(s):  
Population Dynamics ◽  
Seed Treatment ◽  
Management Strategies ◽  
Field Trials ◽  
Lissorhoptrus Oryzophilus ◽  
Rice Water Weevil ◽  
Lambda Cyhalothrin ◽  
Beneficial Impact ◽  
Early Injury ◽  
Rice Water

The rice water weevil, Lissorhoptrus oryzophilus Kuschel, has been managed for the past 30 yrs using the soil insecticide carbofuran. The recent cancellation of the registration for carbofuran in rice has necessitated a shift to management strategies involving other insecticides, including lambda-cyhalothrin, fipronil, and diflubenzuron. Efficacies and effects on population dynamics of three alternatives to carbofuran (lambda-cyhalothrin and diflubenzuron as foliar sprays and fipronil as a seed treatment) were compared in two water-seeded and one drill-seeded field trials. Applications of lambda-cyhalothrin, but not of diflubenzuron or fipronil, resulted in decreases in the densities of rice water weevil adults and eggs. All three insecticides suppressed larval densities to levels comparable to, or lower than, densities in plots treated with carbofuran. All three alternatives to carbofuran differed from carbofuran with respect to their effects on the population dynamics of weevil larvae. Lambda-cyhalothrin, diflubenzuron, and fipronil were more effective than carbofuran at preventing early larval infestation of rice roots, but were less effective at preventing later infestation of roots. Yields from plots treated with fipronil, diflubenzuron, and lambda-cyhalothrin were generally higher than yields from plots treated with carbofuran, probably because prevention of early injury to roots has a more beneficial impact than prevention of later injury. This study also provided evidence for the utility of early planting and delayed flooding for management of the rice water weevil.

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.

scholarly journals On the spatial spread of the Rice Water Weevil, Lissorhoptrus oryzophilus Kuschel (Coleoptera: Erirhinidae), in Italy

2010 ◽  
Vol 42 (2) ◽  
pp. 81 ◽  
Author(s):  
Daniela Lupi ◽  
Mario Colombo ◽  
Maria Luisa Giudici ◽  
Bruno Villa ◽  
Cesare Cenghialta ◽  
...  
Keyword(s):  
Lissorhoptrus Oryzophilus ◽  
Corine Land Cover ◽  
Spatial Spread ◽  
Rice Water Weevil ◽  
Rate Of Spread ◽  
Rice Area ◽  
Stratified Dispersal ◽  
Land Cover Map ◽  
Rice Water ◽  
Environmental Landscape

A five year study has been made to establish the spread of the rice water weevil <em>Lissorhoptrus oryzophilus</em> (Coleoptera: Erirhinidae) in Northern Italy. Data obtained with GPS from 2005 throughout 2009 were first georeferenced with SW ArcGis&reg; 9.2, then overlapped and compared to the map of the European environmental landscape based on the interpretation of satellite images (CORINE Land Cover map) and to the hydrographic chart CT10 (Technical Regional map 10000). The analysis of the radial rate of spread per year indicates a deceleration in the expansion from 10.864 &plusmn; 6.801 km/year in 2005 to 5.318 &plusmn; 1.401 km/year in 2009. In five years the weevil has expanded its distribution in nearly all rice paddies in Lombardy and Piedmont, over an area of about 200,000 ha, which correspond to 86% of the total Italian rice area. Its expansion is thought to follow a type of stratified dispersal, due both to insect adult active dispersal and to accidental movements caused by human transportation.

A Way to Distinguish Sex of Adult Hylobius Weevils in the Field

1966 ◽  
Vol 98 (10) ◽  
pp. 1118-1119 ◽  
Author(s):  
L. F. Wilson ◽  
C. D. Waddell ◽  
I. Millers
Keyword(s):  
North America ◽  
North American ◽  
Abdominal Sternite ◽  
Hylobius Abietis ◽  
Lissorhoptrus Oryzophilus ◽  
Female Adult ◽  
Rice Water Weevil ◽  
Rice Water

The median depression on the last abdominal sternite is a useful character for distinguishing, in the field, the male from the female adult of all North American Hylobius species.Everett and Newsom (1964) used a midline depression or sulcus on the abdominal sternites to separate the sexes of the rice water weevil, Lissorhoptrus oryzophilus (Kushel), and other weevils that are not closely related to species of Hylobius in North America. The male of Hylobius abietis L., a European relative, is distinguished from the female by a saucerlilte depression on the last sternite (Anonymous 1952). Millers et al. (1963) state that the first and second visible abdominal sterna of the male H. rhizophagus Millers are concave, and the fifth has a slight median depression; the female sterna are convex.

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.

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