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Jaeeup Park - One of the best experts on this subject based on the ideXlab platform.

  • life cycle and host specificity of tanysphyrus tanysphyroides major roelofs coleoptera curculionidae a possible candidate agent for the biological control of Monochoria vaginalis var plantaginea
    Korean Journal of Weed Science, 2011
    Co-Authors: Jinyoung Park, Jaeeup Park, In Young Lee, Oh Seok Kwon, Jong Kyun Park
    Abstract:

    Monochoria vaginalis var. plantaginea (Pontederiaceae) is one of the most problematic weed in the rice field in Korea. Tanysphyrus (Tanysphyroides) major was selected as a potential biological control agent for M. vaginalis. Continuous rearing of T. (T.) major was carried out from 2006 to 2007, and its morphological characteristics and ecological characteristics were investigated. This species has a single generation per year, over-wintering as an adult stage. The emergence of adults starts in later June and last until September. These observations indicate that T. (T.) major takes 22±0.7 days to develop from egg to adulthood. Host specificity test showed that finally selected this species was suitable candidates for the biological control of M. vaginalis var. plantaginea since it showed negative host specificity against major 60 test crops.

  • characterization of the acetolactate synthase als gene and molecular assay of mutations associated with sulfonylurea herbicide resistance of Monochoria vaginalis
    The Korean Journal of Pesticide Science, 2009
    Co-Authors: Tae Seon Park, Hong Kyu Park, In Yong Lee, Youngdoo Kim, Jaeeup Park
    Abstract:

    This research aims to contribute the characterization of acetolactate synthase (Ec 4.1.3.18; ALS) and the resistance mechanism by sequence analysis of ALS gene of the sulfonylurea-resisatnt and -susceptible Monochoria vaginalis. The ALS gene was obtained from susceptible (S) and resistant (R) M. vaginalis to sulfonylurea herbicides (SUs). The 815 bp the fragment and the genomic DNA sequence coding for acetolactate synthase (ALS) of S and R biotypes of M. vaginalis were cloned and sequenced. Nineteen clones were divided greatly into 4 groups as result of sequencing. The first group was not difference to S type, the second group was amino acid of P197S which found point mutations causing substitution of serine for proline at amino acid 197, the third group was observed greatly other part of 6 places than group 1, and the fourth group appeared the intergrade of group 1 and 3. Therefore, it could be assumed what ALS gene of various types can be one plant. The peptide of the 13 amino acid Domain A region for ALS genes from R biotype of M. vaginalis differed from that of the S biotype by one base substitution at proline codon of Domain A. It could also be confirmed that point mutation of serine for proline at amino acid 197.

  • biological control effect of Monochoria vaginalis with tanysphyrus tanysphyroides major
    Weed&Turfgrass Science, 2008
    Co-Authors: Jinyoung Park, Jaeeup Park, In Yong Lee
    Abstract:

    This experiment was conducted to get basic data for biological control of Monochoria vaginalis. Thirtythree plants of the M. vaginalis were planted for the Tanysphyrus (Tanysphyroides) major releasing experiment. Every experimental plots planted with M. vaginalis were treated with the adults of regulated 35, 50 and 100 pairs. Control effect to M. vaginalis by the adults density of T. (T.) major were investigates. When the 25, 50 and 100 adult pairs treated in the middle stages of M. vaginalis, required period for effective biological control were 7, 6 and 4 weeks, respectively. Also, M. vaginalis injured by the T. (T.) major were not regrowth and fruits. T. (T.) major adults when input 25 and 50 pairs, necessary time were required 14 weeks for biological control of later stages M. vaginalis, and seed investigated number of 13,231 and 10,157, respectively. And case of 100 pairs was 11 weeks, and seed investigated number of 4,469. Seed weight was 1.63, 1.24 and 0.48g, respectively. The middle stages of M. vaginalis was the most effective period (time) for biological control with T. (T.) major.

  • effect of tanysphyrus tanysphyroides major roelofs coleoptera curculionidae a potential biological control of Monochoria vaginalis
    Korean Journal of Weed Science, 2007
    Co-Authors: Jinyoung Park, In Yong Lee, Jaeeup Park
    Abstract:

    This experiment was conducted to get basic data for biological control of Monochoria (Monochoria vaginalis). One M. vaginalis plant was chosen for the Tanysphyrus (Tanysphyroides) major releasing experiment. Every caged plant in amount of 2, 4 and 8 pairs released adult insect, both females and males. It investigated the control effect of M. vaginalis. T. (T.) major adults when input 2 and 4 pairs, necessary time were required 30 days for biological control of M. vaginalis, and new adults investigated number of 20 1 and 9 1, respectively. And case of 8 pairs was 20 days, and new adults investigated number of 5 1. Also, M. vaginalis did not reproduced in each experimental plot, and their seed did not produced.

Jinyoung Park - One of the best experts on this subject based on the ideXlab platform.

  • life cycle and host specificity of tanysphyrus tanysphyroides major roelofs coleoptera curculionidae a possible candidate agent for the biological control of Monochoria vaginalis var plantaginea
    Korean Journal of Weed Science, 2011
    Co-Authors: Jinyoung Park, Jaeeup Park, In Young Lee, Oh Seok Kwon, Jong Kyun Park
    Abstract:

    Monochoria vaginalis var. plantaginea (Pontederiaceae) is one of the most problematic weed in the rice field in Korea. Tanysphyrus (Tanysphyroides) major was selected as a potential biological control agent for M. vaginalis. Continuous rearing of T. (T.) major was carried out from 2006 to 2007, and its morphological characteristics and ecological characteristics were investigated. This species has a single generation per year, over-wintering as an adult stage. The emergence of adults starts in later June and last until September. These observations indicate that T. (T.) major takes 22±0.7 days to develop from egg to adulthood. Host specificity test showed that finally selected this species was suitable candidates for the biological control of M. vaginalis var. plantaginea since it showed negative host specificity against major 60 test crops.

  • biological control effect of Monochoria vaginalis with tanysphyrus tanysphyroides major
    Weed&Turfgrass Science, 2008
    Co-Authors: Jinyoung Park, Jaeeup Park, In Yong Lee
    Abstract:

    This experiment was conducted to get basic data for biological control of Monochoria vaginalis. Thirtythree plants of the M. vaginalis were planted for the Tanysphyrus (Tanysphyroides) major releasing experiment. Every experimental plots planted with M. vaginalis were treated with the adults of regulated 35, 50 and 100 pairs. Control effect to M. vaginalis by the adults density of T. (T.) major were investigates. When the 25, 50 and 100 adult pairs treated in the middle stages of M. vaginalis, required period for effective biological control were 7, 6 and 4 weeks, respectively. Also, M. vaginalis injured by the T. (T.) major were not regrowth and fruits. T. (T.) major adults when input 25 and 50 pairs, necessary time were required 14 weeks for biological control of later stages M. vaginalis, and seed investigated number of 13,231 and 10,157, respectively. And case of 100 pairs was 11 weeks, and seed investigated number of 4,469. Seed weight was 1.63, 1.24 and 0.48g, respectively. The middle stages of M. vaginalis was the most effective period (time) for biological control with T. (T.) major.

  • effect of tanysphyrus tanysphyroides major roelofs coleoptera curculionidae a potential biological control of Monochoria vaginalis
    Korean Journal of Weed Science, 2007
    Co-Authors: Jinyoung Park, In Yong Lee, Jaeeup Park
    Abstract:

    This experiment was conducted to get basic data for biological control of Monochoria (Monochoria vaginalis). One M. vaginalis plant was chosen for the Tanysphyrus (Tanysphyroides) major releasing experiment. Every caged plant in amount of 2, 4 and 8 pairs released adult insect, both females and males. It investigated the control effect of M. vaginalis. T. (T.) major adults when input 2 and 4 pairs, necessary time were required 30 days for biological control of M. vaginalis, and new adults investigated number of 20 1 and 9 1, respectively. And case of 8 pairs was 20 days, and new adults investigated number of 5 1. Also, M. vaginalis did not reproduced in each experimental plot, and their seed did not produced.

In Yong Lee - One of the best experts on this subject based on the ideXlab platform.

  • prediction of seedling emergence and early growth of Monochoria vaginalis and scirpus juncoides under elevated temperature
    Korean Journal of Weed Science, 2010
    Co-Authors: Minwon Park, In Yong Lee, Jin Won Kim, Soohyun Lim, Dosoon Kim
    Abstract:

    This experiment was conducted to investigate seedling emergence and early growth of Monochoria vaginalis and Scirpus juncoides in the controlled-environment chamber maintained at different temperatures. Non-linear regression analyses of observed data against effective accumulated temperature (EAT) with the Gompertz and logistic models showed that the Gompertz and logistic models worked well in describing seedling emergence and early growth of both weed species, respectively, regardless of temperature. EATs required for 50% of the maximum seedling emergence and the maximum leaf number of M. vaginalis were estimated to be 69.3 and 131℃, respectively, while those of S. juncoides were 94.8 and 137℃, respectively. Models developed in this study thus were used to predict seedling emergence and early growth under elevated temperature condition. If rotary tillage with water is made on 27 May under +3℃ elevated temperature condition, dates for 50% of the maximum seedling emergence and 4 leaf stage were predicted to be 1 June and 15 June for M. vaginalis and 3 June and 14 June for S. juncoides, respectively. As compared with current temperature, these dates are 1-2 days earlier for the seedling emergence and 3 days earlier for the early growth, suggesting that earlier application of herbicides is required for effective control of M. vaginalis and S. juncoides under elevated temperature condition in the future.

  • characterization of the acetolactate synthase als gene and molecular assay of mutations associated with sulfonylurea herbicide resistance of Monochoria vaginalis
    The Korean Journal of Pesticide Science, 2009
    Co-Authors: Tae Seon Park, Hong Kyu Park, In Yong Lee, Youngdoo Kim, Jaeeup Park
    Abstract:

    This research aims to contribute the characterization of acetolactate synthase (Ec 4.1.3.18; ALS) and the resistance mechanism by sequence analysis of ALS gene of the sulfonylurea-resisatnt and -susceptible Monochoria vaginalis. The ALS gene was obtained from susceptible (S) and resistant (R) M. vaginalis to sulfonylurea herbicides (SUs). The 815 bp the fragment and the genomic DNA sequence coding for acetolactate synthase (ALS) of S and R biotypes of M. vaginalis were cloned and sequenced. Nineteen clones were divided greatly into 4 groups as result of sequencing. The first group was not difference to S type, the second group was amino acid of P197S which found point mutations causing substitution of serine for proline at amino acid 197, the third group was observed greatly other part of 6 places than group 1, and the fourth group appeared the intergrade of group 1 and 3. Therefore, it could be assumed what ALS gene of various types can be one plant. The peptide of the 13 amino acid Domain A region for ALS genes from R biotype of M. vaginalis differed from that of the S biotype by one base substitution at proline codon of Domain A. It could also be confirmed that point mutation of serine for proline at amino acid 197.

  • biological control effect of Monochoria vaginalis with tanysphyrus tanysphyroides major
    Weed&Turfgrass Science, 2008
    Co-Authors: Jinyoung Park, Jaeeup Park, In Yong Lee
    Abstract:

    This experiment was conducted to get basic data for biological control of Monochoria vaginalis. Thirtythree plants of the M. vaginalis were planted for the Tanysphyrus (Tanysphyroides) major releasing experiment. Every experimental plots planted with M. vaginalis were treated with the adults of regulated 35, 50 and 100 pairs. Control effect to M. vaginalis by the adults density of T. (T.) major were investigates. When the 25, 50 and 100 adult pairs treated in the middle stages of M. vaginalis, required period for effective biological control were 7, 6 and 4 weeks, respectively. Also, M. vaginalis injured by the T. (T.) major were not regrowth and fruits. T. (T.) major adults when input 25 and 50 pairs, necessary time were required 14 weeks for biological control of later stages M. vaginalis, and seed investigated number of 13,231 and 10,157, respectively. And case of 100 pairs was 11 weeks, and seed investigated number of 4,469. Seed weight was 1.63, 1.24 and 0.48g, respectively. The middle stages of M. vaginalis was the most effective period (time) for biological control with T. (T.) major.

  • effect of tanysphyrus tanysphyroides major roelofs coleoptera curculionidae a potential biological control of Monochoria vaginalis
    Korean Journal of Weed Science, 2007
    Co-Authors: Jinyoung Park, In Yong Lee, Jaeeup Park
    Abstract:

    This experiment was conducted to get basic data for biological control of Monochoria (Monochoria vaginalis). One M. vaginalis plant was chosen for the Tanysphyrus (Tanysphyroides) major releasing experiment. Every caged plant in amount of 2, 4 and 8 pairs released adult insect, both females and males. It investigated the control effect of M. vaginalis. T. (T.) major adults when input 2 and 4 pairs, necessary time were required 30 days for biological control of M. vaginalis, and new adults investigated number of 20 1 and 9 1, respectively. And case of 8 pairs was 20 days, and new adults investigated number of 5 1. Also, M. vaginalis did not reproduced in each experimental plot, and their seed did not produced.

Jong Kyun Park - One of the best experts on this subject based on the ideXlab platform.

Zhang Jun - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Wettable Powder Mixed with Butachlor and Pyrazosulfuron for Control of Weeds in Transplanted Rice Fields
    Hubei Agricultural Sciences, 2012
    Co-Authors: Zhang Jun
    Abstract:

    To provide guidance for chemical weed management in broadcasted rice fields,trials were conducted to evaluate the effects on weed control and crop yield of a fertilizer formulation mixed with 28% butachlor and pyrazosulfuron WP.The results showed that 28% butachlor and pyrazosulfuron WP 226.8~525.0 g(a.i)/hm2 had good control effects on Echinochloa crusgalli(L.) Beauv,Monochoria vaginalis(Burm.F.),Rotala indica,Cyperus difformis L.in transplanted rice fields.The overall fresh control effects and density control effects were significantly higher than 60% butachlor EC and 10% pyrazosulfuron WP.The application of 28% butachlor + pyrazosulfuron WP significantly reduced the weeds absorption of nutrition and water,resulting in prominent yield enhancing.

  • Effects of Wettable Powder Mixed with Quinclorac and Pyrazosulfuron for Control of Weeds in Direct Sowing Rice Fields
    Hubei Agricultural Sciences, 2012
    Co-Authors: Zhang Jun
    Abstract:

    Trials were conducted to evaluate the effects of wettable powder mixed with quinclorac and pyrazosulfuron for control of weeds,as well as the effects of the absorption of nitrogen and crop yield.The results showed that 20% quinclorac and pyrazosulfuron WP had good control effects on Echinochloa crusgalli(L.) Beauv,Monochoria vaginalis(Burm.F.),Rotala indica,Cyperus difformis L.in broacasted rice fields.The overall fresh control effects and density control effects were over 94% at 150～270 g / hm2,and siginificantly higer than 50% quinclorac WP and 10% pyrazosulfuron WP.The application of 20% quinclorac and pyrazosulfuron WP siginificantly reduced the weeds absorption of nurition and water,resulting in prominent yield enhancing.