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Liu S.,China Agricultural University | Liu S.,Hunan Plant Protection Institute | Bai A.,China Agricultural University | Zhou L.,China Agricultural University | And 5 more authors.
Journal of Chemistry | Year: 2015

The residue levels of thiram during potato cultivation in open field were evaluated. Thiram residues were determined by methylation derivation method with high performance liquid chromatography (HPLC). Wettable powder (WP) formulation containing 25% thiram was applied at 2320 g active gradient hm-2 (a.i. hm-2) dosage for the dissipation study. The decline rate in potato leave and soil followed first-order kinetics equation, and the half-life ranged from 2.8 to 5.4 days and 2.6 to 9.9 days, respectively. In terminal residue, the thiram was sprayed at 580 g a.i. hm-2 (low concentration, recommended dosage) and 1160 g a.i. hm-2 (high concentration, double of recommended dosage). The residues of thiram in potato and soil samples collected in the field at preharvest interval of 21 days and 30 days were all below 0.02 mg kg-1. The results show that thiram possesses low dietary risk in potato at harvest according to supervised residue field trial. It may be safe when used at recommended rate of application. © 2015 Shaowen Liu et al. Source

LI J.-J.,CAS Institute of Subtropical Agriculture | LI J.-J.,University of Chinese Academy of Sciences | XIAO Y.-L.,CAS Institute of Subtropical Agriculture | XIAO Y.-L.,Hunan Plant Protection Institute | And 2 more authors.
Journal of Integrative Agriculture | Year: 2012

One sequence tagged site marker Sub1-1 and twice submergence stress method were used in selection of submergence tolerant homozygous line from Sub-1BS, a submergence tolerant, bentazon sensitive and photoperiod-sensitive and/or thermo-sensitive genic male sterile line that developed by our laboratory. The results revealed that the original Sub-1BS was heterozygous in Sub1A-1 locus even though it was identical in almost all of agronomical traits and the segregation of Sub1A-1 was in accordance with Mendelian law based on chi-square test. And then the original Sub-1BS was divided into two groups: one was of Sub1A-1 introgression and the other was not; and the two groups were tested by twice submergence stress method. After the first submergence stress that lasted for 12 d, the average plant heights were significant difference at the 1% level between the two groups. After recovery for 10 d, the second submergence stress sustained for 18 d was carried on; and the group with Sub1A-1 gene was found apparently tolerant than the other group in submergence tolerance. © 2012 Chinese Academy of Agricultural Sciences. Source

Hu Y.-H.,Hunan Plant Protection Institute | Dong J.,Hunan Plant Protection Institute | Liu X.-X.,Hunan Plant Protection Institute | Zhang Q.-W.,China Agricultural University | Zhao Z.-W.,China Agricultural University
Journal of Entomological Science | Year: 2011

Ground beetles (Coleoptera: Carabidae) inhabiting a peach orchard were collected using pitfall traps placed adjacent to plastic barriers that were perpendicular to each other and crossed each other at their midpoints. Each array of traps contained 5 traps with 1 at the midpoint of each barrier and the other 4 at the ends of each plastic barrier. The trap located at the center of each array captured about 40% of the total beetles trapped by each array, thus suggesting that a single trap located at the center of the array could be a more efficient means of sampling. Using spatial autocorrelation techniques, the range of spatial dependence for the two herbivorous carabids collected in this study - Harpalus tschiliensis Schauberger and Harpalus griseus Panzer ranged from 136.7 - 210.3 m, whereas that of the predatory carabid Calathus halensi Schailer ranged from 330.1 - 412.4 m. Based upon our results, we suggest that pitfall traps used for monitoring or sampling carabid beetles be set no further than 210 m apart for herbivorous species and 412 m apart for carnivorous species. Source

Zhang S.,Hunan Plant Protection Institute | Zhang D.,Hunan Plant Protection Institute | Zhang D.,Central South University | Liu Y.,Hunan Plant Protection Institute | And 4 more authors.
Journal of Pure and Applied Microbiology | Year: 2013

The intermediates in fenpropathrin biodegradation process by Rhodopseudomonas palustris PSB07-19 were detected by gas chromatograph/mass spectrometer (GC/MS). Three intermediates, n-isopropyl-3-phenylpropanamide, 2,4-Dimethylamphetamin and 2-amino-1-[o-methoxyphenyI] propane were detected, and the retention times of these intermediates were 7.983 min, 8.764 min, and 9.236 min, respectively. Based on these intermediates, the deduced fenpropathrin biodegradation protocol was descriptive. This study hints exsiting different biodegradation pathway of pyrethroids residue, and would enrich our knowledge about removing and cleaning up pyrethroids residue in environments. Source

Zou N.,China Agricultural University | Gu K.,China Agricultural University | Liu S.,China Agricultural University | Liu S.,Hunan Plant Protection Institute | And 5 more authors.
Journal of Separation Science | Year: 2016

An analytical method based on dispersive solid-phase extraction with a multiwalled carbon nanotubes sorbent coupled with positive pulse glow discharge ion mobility spectrometry was developed for analysis of 30 pesticide residues in drinking water samples. Reduced ion mobilities and the mass-mobility correlation of 30 pesticides were measured. The pesticides were divided into five groups to verify the separation capability of pulse glow discharge in mobility spectrometry. The extraction conditions such as desorption solvent, ionic strength, conditions of adsorption and desorption, the amounts of multiwalled carbon nanotubes, and solution pH were optimized. The enrichment factors of pesticides were 5.4- to 48.7-fold (theoretical enrichment factor was 50-fold). The detection limits of pesticides were 0.010.77 μg/kg. The linear range was 0.005-0.2 mg/L for pesticide standard solutions, with determination coefficients from 0.9616 to 0.9999. The method was applied for the analysis of practical and spiked drinking water samples. All results were confirmed by high-performance liquid chromatography with tandem mass spectrometry. The proposed method was proven to be a commendably rapid screening qualitative and semiquantitative technique for the analysis of pesticide residues in drinking water samples on site. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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