scholarly journals Seasonal prevalence and control threshold of rice water weevil (Lissorhoptrus oryzophilus Kuschel) at different planting dates in Nagasaki prefecture.

1989 ◽  
Vol 35 ◽  
pp. 83-87
Author(s):  
Yoshio OGAWA ◽  
Kiyotoshi YOKOMIZO ◽  
Isaburou ICHIKAWA
Keyword(s):  
Seasonal Prevalence ◽  
Lissorhoptrus Oryzophilus ◽  
Planting Dates ◽  
Rice Water Weevil ◽  
Control Threshold ◽  
Rice Water ◽  
And Control ◽  
Nagasaki Prefecture

scholarly journals Integration of Host Plant Resistance and Cultural Tactics for Management of Root- and Stem-Feeding Insect Pests in Rice

2021 ◽  
Vol 3 ◽  
Author(s):  
James M. Villegas ◽  
Blake E. Wilson ◽  
Michael J. Stout
Keyword(s):  
Seed Treatment ◽  
Field Experiments ◽  
Insect Pests ◽  
Block Design ◽  
Rice Cultivar ◽  
Management Program ◽  
Lissorhoptrus Oryzophilus ◽  
Planting Dates ◽  
Rice Water Weevil ◽  
Rice Water

The rice water weevil, Lissorhoptrus oryzophilus Kuschel, is the most important early-season pest of rice in the U.S. Additionally, lepidopteran stem-boring pests particularly the invasive Mexican rice borer, Eoreuma loftini (Dyar), are increasingly becoming problematic in Louisiana rice. Although insecticidal seed treatments have been widely adopted and have proven highly effective against weevils and stemborers, alternative management tactics are needed. This study was conducted to evaluate the effects of flood timing and rice cultivar on rice water weevil and stemborer infestations. Field experiments were conducted in Crowley, Louisiana, from 2019–2020. In each year, early- and late-planted trials were established according to a split-split-plot randomized block design. Four commonly grown rice cultivars were selected and were either treated or not treated with a chlorantraniliprole seed treatment. Permanent flood was established at normal timing (approximately the five-leaf stage) or delayed by 2 weeks. Seed treatment reduced weevil densities and stemborer injury by 70–84% and 87–94%, respectively, across planting dates, years, cultivars, and flood timings. The rice cultivar ‘Jupiter' consistently supported the highest numbers of immature weevils, whereas low levels of stemborer injury were observed in ‘Jazzman-2'. Weevil densities were 72 and 20% lower in plots subjected to delayed flood compared to normal flood timing in the 2019 and 2020 late-planted trials, respectively. Reductions of 79 and 93% in stemborer injury in the 2019 early- and late-planted trials, respectively, were observed in delayed flooded plots. Weevil and stemborer infestations negatively affected rice yields, with losses among cultivars ranging from 14 to 49%. Yield losses were generally lower in plots subjected to delayed flood compared to normal flood timing but the difference was only significant in the 2020 late-planted trial. Our data suggest that the combination of cultivar resistance and delayed flooding can serve as a valuable component of an integrated pest management program for both rice water weevil and stemborers.

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 Occurrence of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, in Okinawa prefecture.

1986 ◽  
Vol 32 ◽  
pp. 104-109
Author(s):  
Tsuneo KINJO ◽  
Tomohide SHIMADA ◽  
Shoji YAMAUCHI
Keyword(s):  
Lissorhoptrus Oryzophilus ◽  
Rice Water Weevil ◽  
Okinawa Prefecture ◽  
Rice Water

Infection state of Pantoea agglomerans in the rice water weevil Lissorhoptrus oryzophilus (Coleoptera: Curculionidae)

2016 ◽  
Vol 51 (4) ◽  
pp. 561-569 ◽  
Author(s):  
Jingyu Zhang ◽  
Yunshan Huang ◽  
Xu Huang ◽  
Mingxing Jiang
Keyword(s):  
Pantoea Agglomerans ◽  
Lissorhoptrus Oryzophilus ◽  
Rice Water Weevil ◽  
Rice Water

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.

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